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All questions of Control and Coordination for Class 10 Exam
Why are reflex arc connections between input and output nerve made at spinal cord?- a)Because brain is involved in complex thinking
- b)Because brain does not respond fast enough
- c)Because spinal cord is the point where they first meet each other
- d)Because making them in brain will decrease the time of response
Correct answer is option 'C'. Can you explain this answer?
Why are reflex arc connections between input and output nerve made at spinal cord?
a)
Because brain is involved in complex thinking
b)
Because brain does not respond fast enough
c)
Because spinal cord is the point where they first meet each other
d)
Because making them in brain will decrease the time of response
|
Smita mehta answered |
When we touch any hot object without knowing it is hot, we immediately throughout the object to safe our hand from burning. We have a sensory nerve in our brain to detect the heat. The nerves that are connected to the muscles of the hand are also connected with the sensory nerves. This connection of detecting the signal from the nerves to the muscles for immediate action is called Reflex Arc.
Instant and automatic responses are possible by Reflex Arc. The connection between input and output nerves are connected by Reflex Arc and meets in a bundle in the spinal chord. All the nerves on their way to brain meet in a bundle in the spinal chord to send the information to the brain.
The part of a neuron where information is acquired is:- a)Axon
- b)Cell body
- c)Dendritic tip
- d)Nucleus
Correct answer is 'C'. Can you explain this answer?
The part of a neuron where information is acquired is:
a)
Axon
b)
Cell body
c)
Dendritic tip
d)
Nucleus
|
Anjana Khatri answered |
The dendritic tip sets off a chemical reaction that creates an electrical impulse.
Mark the odd one out:- a)Auxin
- b)Abscisic acid
- c)Cytokinin
- d)Gibberellins
Correct answer is option 'B'. Can you explain this answer?
Mark the odd one out:
a)
Auxin
b)
Abscisic acid
c)
Cytokinin
d)
Gibberellins
|
|
Harshit Agrawal answered |
Correct option is B as auxin , cytokinin and gibberellins are growth promoting plant hormones while Abscisic acid is the growth inhibitior plant hormone.
Match the following-
Column I Column II
1. Hormones i) Shoot
2. Seedling germination ii) growth of pollen tubes towards ovules
3. Chemotropic iii) Root
4. Positively geotropic iv) synthesized at places away from where they act
5. Positively phototropic v) growth- a)1 – iv; 2 – v; 3 – ii; 4 – iii; 5 – i
- b)1 – v; 2 – iv; 3 – ii; 4 – iii; 5 – i
- c)1- iv; 2 – iii; 3 – iv; 4 – ii; 5 – i
- d)1 – iv; 2 – v; 3 – iii; 4 – ii; 5 – i
Correct answer is option 'A'. Can you explain this answer?
Match the following-
Column I Column II
1. Hormones i) Shoot
2. Seedling germination ii) growth of pollen tubes towards ovules
3. Chemotropic iii) Root
4. Positively geotropic iv) synthesized at places away from where they act
5. Positively phototropic v) growth
Column I Column II
1. Hormones i) Shoot
2. Seedling germination ii) growth of pollen tubes towards ovules
3. Chemotropic iii) Root
4. Positively geotropic iv) synthesized at places away from where they act
5. Positively phototropic v) growth
a)
1 – iv; 2 – v; 3 – ii; 4 – iii; 5 – i
b)
1 – v; 2 – iv; 3 – ii; 4 – iii; 5 – i
c)
1- iv; 2 – iii; 3 – iv; 4 – ii; 5 – i
d)
1 – iv; 2 – v; 3 – iii; 4 – ii; 5 – i
|
|
Amit Sharma answered |
Hormones synthesized at places away from where they act. Growth is seedling germination. Chemotropic is the growth of pollen tubes towards ovules. Root is positively geotrophic. Shoot is positively phototropic.
Which part of the nervous system controls the reflex activities of the body?- a)Brain
- b)Spinal cord
- c)Cerebrum
- d)Cerebellum
Correct answer is option 'B'. Can you explain this answer?
Which part of the nervous system controls the reflex activities of the body?
a)
Brain
b)
Spinal cord
c)
Cerebrum
d)
Cerebellum
|
EduRev Class 10 answered |
Reflex activities are automatic responses to stimuli that are primarily controlled by the spinal cord, allowing for quick reactions without involving the brain. The brain is responsible for voluntary actions and higher cognitive functions, while the cerebrum and cerebellum handle functions related to movement, balance, and complex thought processes. Reflex actions bypass the brain to save time, which is why the spinal cord is the correct answer.
Choose the correctly matched pair.- a)Fore-brain - Controls posture and balance
- b)Mid-brain - Controls voluntary actions
- c)Hind-brain - Controls involuntary actions such as blood pressure
- d)Cerebellum - Controls memory and thinking
Correct answer is option 'C'. Can you explain this answer?
a)
Fore-brain - Controls posture and balance
b)
Mid-brain - Controls voluntary actions
c)
Hind-brain - Controls involuntary actions such as blood pressure
d)
Cerebellum - Controls memory and thinking
|
Nk Classes answered |
- Option A: Fore-brain - Controls posture and balance: This is incorrect. The fore-brain, specifically the cerebrum, is responsible for complex functions such as thinking, voluntary actions, memory storage, and sensory information integration.
- Option B: Mid-brain - Controls voluntary actions: This is incorrect. The mid-brain primarily controls involuntary actions such as changes in pupil size and reflex movements of the head, neck, and trunk.
- Option C: Hind-brain - Controls involuntary actions such as blood pressure: This is correct. The hind-brain, which includes the medulla, controls involuntary actions such as blood pressure, salivation, and vomiting.
- Option D: Cerebellum - Controls memory and thinking: This is incorrect. The cerebellum, part of the hind-brain, is responsible for controlling posture, balance, and the precision of voluntary actions, not memory and thinking.
Which part of the nervous system serves as the main coordinating center for receiving information and controlling voluntary actions?- a)Peripheral nervous system
- b)Spinal cord only
- c)Central nervous system
- d)Cranial nerves
Correct answer is option 'C'. Can you explain this answer?
a)
Peripheral nervous system
b)
Spinal cord only
c)
Central nervous system
d)
Cranial nerves
|
Kds Coaching answered |
The central nervous system (CNS), consisting of the brain and spinal cord, is the main coordinating center of the body. It receives information from all parts of the body, integrates it, and sends messages to muscles to control voluntary actions such as writing, talking, and moving. The peripheral nervous system facilitates communication between the CNS and other body parts but does not serve as the main control center.
Identify which of the following statements about thyroxin is incorrect?- a)Thyroid gland requires iodine to synthesize thyroxin.
- b)Thyroxin is also called thyroid hormone.
- c)It regulates protein, carbohydrates and fat metabolism in the body.
- d)Iron is essential for the synthesis of thyroxin.
Correct answer is option 'D'. Can you explain this answer?
Identify which of the following statements about thyroxin is incorrect?
a)
Thyroid gland requires iodine to synthesize thyroxin.
b)
Thyroxin is also called thyroid hormone.
c)
It regulates protein, carbohydrates and fat metabolism in the body.
d)
Iron is essential for the synthesis of thyroxin.
|
Apoorv kapoor answered |
Understanding Thyroxin
Thyroxin, also known as T4, is a crucial hormone produced by the thyroid gland. It plays a significant role in regulating various metabolic processes in the body. Let's clarify the statements provided regarding thyroxin.
Correct Statements about Thyroxin
Incorrect Statement about Thyroxin
Conclusion
In summary, while iodine is crucial for thyroxin synthesis and it plays a significant role in metabolism, iron does not have a direct function in the production of this important hormone. Understanding these distinctions is essential for recognizing how thyroid function affects overall health.
Thyroxin, also known as T4, is a crucial hormone produced by the thyroid gland. It plays a significant role in regulating various metabolic processes in the body. Let's clarify the statements provided regarding thyroxin.
Correct Statements about Thyroxin
- Thyroid Gland and Iodine: The thyroid gland requires iodine to synthesize thyroxin. Iodine is an essential element that combines with the amino acid tyrosine to produce thyroid hormones.
- Thyroxin as Thyroid Hormone: Thyroxin is indeed called a thyroid hormone. It is one of the primary hormones secreted by the thyroid gland, the other being triiodothyronine (T3).
- Metabolic Regulation: Thyroxin regulates protein, carbohydrates, and fat metabolism in the body. It influences how the body uses energy, affecting growth and metabolism.
Incorrect Statement about Thyroxin
- Iron's Role: The statement that iron is essential for the synthesis of thyroxin is incorrect. While iron is vital for many physiological processes, including the formation of hemoglobin in red blood cells, it is not required for the synthesis of thyroxin. The key elements for thyroxin production are iodine and the amino acid tyrosine.
Conclusion
In summary, while iodine is crucial for thyroxin synthesis and it plays a significant role in metabolism, iron does not have a direct function in the production of this important hormone. Understanding these distinctions is essential for recognizing how thyroid function affects overall health.
Assertion (A): The pituitary gland is often referred to as the master gland due to its regulatory role over other endocrine glands.Reason (R): The pituitary gland secretes hormones that directly influence the functioning of the thyroid, adrenal glands, and gonads.- a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)If Assertion is true but Reason is false
- d)If both Assertion and Reason are false
Correct answer is option 'A'. Can you explain this answer?
Assertion (A): The pituitary gland is often referred to as the master gland due to its regulatory role over other endocrine glands.
Reason (R): The pituitary gland secretes hormones that directly influence the functioning of the thyroid, adrenal glands, and gonads.
a)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
If Assertion is true but Reason is false
d)
If both Assertion and Reason are false
|
Kamna Science Academy answered |
- The assertion is correct because the pituitary gland does indeed regulate various endocrine glands, earning it the title of the master gland.
- The reason is also true, as the pituitary gland secretes several hormones including TSH (Thyroid Stimulating Hormone), ACTH (Adrenocorticotropic Hormone), and gonadotropins which affect the thyroid gland, adrenal glands, and gonads respectively.
- Therefore, the reason accurately explains why the assertion is true.
- Thus, the correct choice is Option A.
Which of the following option shows the order of events correctly when a bright light is focused on our eyes?- a)Bright light → receptors in eyes → sensory neuronàspinal cord → motor neurons → eyelid closes
- b)Bright light → receptors in eyes → spinal cord → sensory neuron → motor neurons → eyelid closes
- c)Bright light → receptors in eyes → sensory neuron → motor neurons → spinal cord → eyelid closes
- d)Bright light → receptors in eyes → spinal cordà motor neurons → sensory neuron → eyelid closes
Correct answer is option 'A'. Can you explain this answer?
Which of the following option shows the order of events correctly when a bright light is focused on our eyes?
a)
Bright light → receptors in eyes → sensory neuronàspinal cord → motor neurons → eyelid closes
b)
Bright light → receptors in eyes → spinal cord → sensory neuron → motor neurons → eyelid closes
c)
Bright light → receptors in eyes → sensory neuron → motor neurons → spinal cord → eyelid closes
d)
Bright light → receptors in eyes → spinal cordà motor neurons → sensory neuron → eyelid closes
|
|
Kamna Science Academy answered |
When a bright light is focused on our eyes, light receptors in the eyes detect the stimulus and send an impulse via sensory neurons to the spinal cord. The spinal cord then processes the information and sends a signal through motor neurons to the muscles controlling the eyelids, causing them to close. This pathway follows the correct reflex arc sequence, making option (a) the correct answer.
Mark the odd one out:- a)Auxin
- b)Abscisic acid
- c)Cytokinin
- d)Gibberellins
Correct answer is option 'B'. Can you explain this answer?
Mark the odd one out:
a)
Auxin
b)
Abscisic acid
c)
Cytokinin
d)
Gibberellins
|
Keerthana Rane answered |
Auxin, cytokinin and gibberellins are growth promoting plant hormones while Abscisic acid is the growth inhibitior plant hormone.
Assertion (A): Hormones must be released in precise amounts for proper physiological functioning.Reason (R): Feedback mechanisms in the body regulate hormone levels based on internal changes.- a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)If Assertion is true but Reason is false
- d)If both Assertion and Reason are false
Correct answer is option 'A'. Can you explain this answer?
Assertion (A): Hormones must be released in precise amounts for proper physiological functioning.
Reason (R): Feedback mechanisms in the body regulate hormone levels based on internal changes.
a)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
If Assertion is true but Reason is false
d)
If both Assertion and Reason are false
|
|
Kamna Science Academy answered |
- The Assertion is correct because hormones indeed need to be released in specific quantities to maintain homeostasis and ensure proper bodily functions.
- The Reason is also correct as feedback mechanisms, such as those involving insulin and blood sugar levels, play a critical role in monitoring and adjusting hormone secretion.
- Furthermore, the Reason directly explains the Assertion, as these feedback systems are essential for achieving the precise hormone levels necessary for physiological balance.
- Therefore, both statements are true, and the Reason provides the correct explanation for the Assertion.
A part of the body which responds to the in-structions sent from nervous system is called- a)Receptor
- b)Effector
- c)Nerves
- d)Muscles
Correct answer is option 'B'. Can you explain this answer?
A part of the body which responds to the in-structions sent from nervous system is called
a)
Receptor
b)
Effector
c)
Nerves
d)
Muscles
|
Shreya shukla answered |
Understanding Effectors
Effectors play a crucial role in the nervous system's communication and response mechanisms.
What are Effectors?
- Effectors are parts of the body that respond to signals sent by the nervous system.
- They can be muscles or glands that perform actions or secrete substances.
Role of Effectors in the Nervous System
- The nervous system transmits signals from sensory receptors to the central nervous system (CNS).
- After processing the information, the CNS sends out instructions to effectors to elicit a response.
- This could involve muscle contraction (movement) or gland secretion (hormonal response).
Examples of Effectors
- Muscles: These are the primary effectors that cause movement. For example, when you touch something hot, your hand reflexively pulls away due to muscle contraction.
- Glands: These can secrete hormones or other substances in reaction to stimuli. An example is the adrenal glands releasing adrenaline during stress.
Conclusion
In summary, option 'B', Effectors, are essential components that carry out the commands of the nervous system, enabling the body to react appropriately to various stimuli. Their function is vital for maintaining homeostasis and facilitating interaction with the environment.
Effectors play a crucial role in the nervous system's communication and response mechanisms.
What are Effectors?
- Effectors are parts of the body that respond to signals sent by the nervous system.
- They can be muscles or glands that perform actions or secrete substances.
Role of Effectors in the Nervous System
- The nervous system transmits signals from sensory receptors to the central nervous system (CNS).
- After processing the information, the CNS sends out instructions to effectors to elicit a response.
- This could involve muscle contraction (movement) or gland secretion (hormonal response).
Examples of Effectors
- Muscles: These are the primary effectors that cause movement. For example, when you touch something hot, your hand reflexively pulls away due to muscle contraction.
- Glands: These can secrete hormones or other substances in reaction to stimuli. An example is the adrenal glands releasing adrenaline during stress.
Conclusion
In summary, option 'B', Effectors, are essential components that carry out the commands of the nervous system, enabling the body to react appropriately to various stimuli. Their function is vital for maintaining homeostasis and facilitating interaction with the environment.
Assertion (A): The movement of tendrils around objects is due to differential growth rates in the part of the tendril that is away from the object.Reason (R): Tendrils exhibit positive geotropism as they grow towards the ground.- a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)If Assertion is true but Reason is false
- c)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- d)If both Assertion and Reason are false
Correct answer is option 'B'. Can you explain this answer?
Assertion (A): The movement of tendrils around objects is due to differential growth rates in the part of the tendril that is away from the object.
Reason (R): Tendrils exhibit positive geotropism as they grow towards the ground.
a)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
If Assertion is true but Reason is false
c)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
d)
If both Assertion and Reason are false
|
|
Kamna Science Academy answered |
b) If Assertion is true but Reason is false
Explanation:
- Assertion (A):
- Statement: "The movement of tendrils around objects is due to differential growth rates in the part of the tendril that is away from the object."
- Explanation: When a tendril comes in contact with an object, it triggers a response known as thigmotropism (growth in response to touch). The cells on the side of the tendril away from the object elongate faster than those in contact, causing the tendril to bend and eventually coil around the support.
- Conclusion: True.
- Reason (R):
- Statement: "Tendrils exhibit positive geotropism as they grow towards the ground."
- Explanation: Geotropism is the directional growth of plants in response to gravity. Positive geotropism means growing towards the gravitational pull (downward), while negative geotropism means growing away from it (upward). Tendrils, in their climbing behavior, exhibit negative geotropism (they grow upward) to reach supports and optimize light exposure. Their coiling is triggered by touch (thigmotropism), not by gravity.
- Conclusion: False.
Since the Assertion is true and the Reason is false, the correct answer is:
b) If Assertion is true but Reason is false.
Choose the correctly matched pair.- a)Pancreas - Produces Glucagon in response to high blood sugar levels
- b)Pancreas - Produces Insulin in response to high blood sugar levels
- c)Special Cells in Pancreas - Reduce Insulin production when blood sugar levels rise
- d)Special Cells in Pancreas - Increase Glucagon production when blood sugar levels fall
Correct answer is option 'B'. Can you explain this answer?
a)
Pancreas - Produces Glucagon in response to high blood sugar levels
b)
Pancreas - Produces Insulin in response to high blood sugar levels
c)
Special Cells in Pancreas - Reduce Insulin production when blood sugar levels rise
d)
Special Cells in Pancreas - Increase Glucagon production when blood sugar levels fall
|
Surbhi Gupta answered |
Understanding the Role of the Pancreas
The pancreas is a vital organ involved in regulating blood sugar levels through the production of hormones such as insulin and glucagon.
Insulin Production
- Response to High Blood Sugar: The pancreas produces insulin when blood sugar levels rise, such as after eating a meal.
- Function of Insulin: Insulin facilitates the uptake of glucose by cells, promoting its use for energy or storage as glycogen in the liver and muscles.
Glucagon Production
- Response to Low Blood Sugar: In contrast to insulin, glucagon is produced when blood sugar levels fall.
- Function of Glucagon: It triggers the liver to release stored glucose, raising blood sugar levels back to normal.
Specialized Cells in the Pancreas
- Alpha and Beta Cells: The pancreas contains specialized cells known as alpha cells (which produce glucagon) and beta cells (which produce insulin).
- Regulatory Mechanism: When blood sugar levels are high, insulin production increases, while glucagon production decreases, and vice versa when blood sugar is low.
Conclusion
Thus, option 'B' is correct because the pancreas indeed produces insulin in response to high blood sugar levels, playing a crucial role in maintaining glucose homeostasis in the body. This balanced regulation is essential for overall health and metabolic function.
The pancreas is a vital organ involved in regulating blood sugar levels through the production of hormones such as insulin and glucagon.
Insulin Production
- Response to High Blood Sugar: The pancreas produces insulin when blood sugar levels rise, such as after eating a meal.
- Function of Insulin: Insulin facilitates the uptake of glucose by cells, promoting its use for energy or storage as glycogen in the liver and muscles.
Glucagon Production
- Response to Low Blood Sugar: In contrast to insulin, glucagon is produced when blood sugar levels fall.
- Function of Glucagon: It triggers the liver to release stored glucose, raising blood sugar levels back to normal.
Specialized Cells in the Pancreas
- Alpha and Beta Cells: The pancreas contains specialized cells known as alpha cells (which produce glucagon) and beta cells (which produce insulin).
- Regulatory Mechanism: When blood sugar levels are high, insulin production increases, while glucagon production decreases, and vice versa when blood sugar is low.
Conclusion
Thus, option 'B' is correct because the pancreas indeed produces insulin in response to high blood sugar levels, playing a crucial role in maintaining glucose homeostasis in the body. This balanced regulation is essential for overall health and metabolic function.
The pancreas increases insulin production when blood sugar levels _____.- a)fall
- b)rise
- c)remain constant
- d)fluctuate frequently
Correct answer is option 'B'. Can you explain this answer?
The pancreas increases insulin production when blood sugar levels _____.
a)
fall
b)
rise
c)
remain constant
d)
fluctuate frequently
|
Varsha jain answered |
Understanding Insulin Production in the Pancreas
The pancreas plays a crucial role in maintaining blood sugar levels through the secretion of insulin. This hormone is essential for the regulation of glucose in the bloodstream.
When Blood Sugar Levels Rise
- Insulin Release: The pancreas increases insulin production when blood sugar levels rise, particularly after eating carbohydrates.
- Glucose Uptake: Insulin facilitates the uptake of glucose by cells, allowing them to use it for energy.
- Storage of Excess Glucose: Insulin also promotes the storage of excess glucose in the liver and muscles as glycogen, thereby lowering blood sugar levels.
Consequences of High Blood Sugar
- Hyperglycemia: Persistently high blood sugar can lead to conditions like diabetes. Insulin helps to prevent this by normalizing glucose levels.
- Feedback Mechanism: The body uses a feedback loop; when blood sugar rises, insulin is secreted, and when it falls, insulin production decreases.
Summary
In summary, the correct answer is that the pancreas increases insulin production when blood sugar levels rise. This process is vital for maintaining homeostasis and ensuring that our bodies function effectively. Understanding this mechanism is essential for recognizing how diet and lifestyle choices can impact overall health.
The pancreas plays a crucial role in maintaining blood sugar levels through the secretion of insulin. This hormone is essential for the regulation of glucose in the bloodstream.
When Blood Sugar Levels Rise
- Insulin Release: The pancreas increases insulin production when blood sugar levels rise, particularly after eating carbohydrates.
- Glucose Uptake: Insulin facilitates the uptake of glucose by cells, allowing them to use it for energy.
- Storage of Excess Glucose: Insulin also promotes the storage of excess glucose in the liver and muscles as glycogen, thereby lowering blood sugar levels.
Consequences of High Blood Sugar
- Hyperglycemia: Persistently high blood sugar can lead to conditions like diabetes. Insulin helps to prevent this by normalizing glucose levels.
- Feedback Mechanism: The body uses a feedback loop; when blood sugar rises, insulin is secreted, and when it falls, insulin production decreases.
Summary
In summary, the correct answer is that the pancreas increases insulin production when blood sugar levels rise. This process is vital for maintaining homeostasis and ensuring that our bodies function effectively. Understanding this mechanism is essential for recognizing how diet and lifestyle choices can impact overall health.
Assertion (A): The nervous system in animals is responsible for controlling and coordinating body functions through electrical impulses.
Reason (R): The nervous system consists solely of the brain and spinal cord, and does not include any other structures.
- a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)If Assertion is true but Reason is false
- d)If both Assertion and Reason are false
Correct answer is option 'C'. Can you explain this answer?
Assertion (A): The nervous system in animals is responsible for controlling and coordinating body functions through electrical impulses.
Reason (R): The nervous system consists solely of the brain and spinal cord, and does not include any other structures.
a)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
If Assertion is true but Reason is false
d)
If both Assertion and Reason are false
|
|
Nk Classes answered |
- The Assertion (A) is correct because the nervous system indeed controls and coordinates body functions through the transmission of electrical impulses. This is a fundamental aspect of how the nervous system operates.
- However, the Reason (R) is incorrect. While the brain and spinal cord are major components of the central nervous system (CNS), the nervous system also includes peripheral nerves that extend from the CNS to other parts of the body. Thus, the Reason does not accurately explain the Assertion.
- Therefore, the correct answer is Option B: both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
What is the role of auxin in plants?- a)It promotes the growth of fruits.
- b)It helps in the upward movement of water.
- c)It controls the bending of plants towards light.
- d)It regulates the fruit's response to gravity.
Correct answer is option 'C'. Can you explain this answer?
What is the role of auxin in plants?
a)
It promotes the growth of fruits.
b)
It helps in the upward movement of water.
c)
It controls the bending of plants towards light.
d)
It regulates the fruit's response to gravity.
|
Ashwini das answered |
Role of Auxin in Plants
Auxin is a vital plant hormone that plays a crucial role in various growth and developmental processes. Among its many functions, one of the most significant is its involvement in the bending of plants toward light, a phenomenon known as phototropism.
Phototropism: Bending Towards Light
- Auxin accumulates on the shaded side of a plant stem when light is coming from one direction.
- This uneven distribution of auxin causes the cells on the shaded side to elongate more than those on the light-exposed side.
- As a result, the plant bends toward the light source, allowing it to maximize photosynthesis by accessing more light.
Other Functions of Auxin
While option 'C' is correct, it's essential to understand that auxin has other vital roles:
- Fruit Development: Auxin promotes the growth and development of fruits, but this is not its primary role in bending towards light.
- Water Movement: Auxin does not directly help in the upward movement of water; this is primarily the function of other mechanisms like transpiration and root pressure.
- Gravitropism: Auxin also plays a role in how plants respond to gravity (gravitropism), but this is different from its role in light response.
Conclusion
In summary, auxin is primarily responsible for the bending of plants toward light by regulating cell elongation. This adaptation enhances a plant's ability to absorb sunlight, which is crucial for its growth and survival. Understanding auxin's functions is essential in botany, as it highlights how plants interact with their environment.
Auxin is a vital plant hormone that plays a crucial role in various growth and developmental processes. Among its many functions, one of the most significant is its involvement in the bending of plants toward light, a phenomenon known as phototropism.
Phototropism: Bending Towards Light
- Auxin accumulates on the shaded side of a plant stem when light is coming from one direction.
- This uneven distribution of auxin causes the cells on the shaded side to elongate more than those on the light-exposed side.
- As a result, the plant bends toward the light source, allowing it to maximize photosynthesis by accessing more light.
Other Functions of Auxin
While option 'C' is correct, it's essential to understand that auxin has other vital roles:
- Fruit Development: Auxin promotes the growth and development of fruits, but this is not its primary role in bending towards light.
- Water Movement: Auxin does not directly help in the upward movement of water; this is primarily the function of other mechanisms like transpiration and root pressure.
- Gravitropism: Auxin also plays a role in how plants respond to gravity (gravitropism), but this is different from its role in light response.
Conclusion
In summary, auxin is primarily responsible for the bending of plants toward light by regulating cell elongation. This adaptation enhances a plant's ability to absorb sunlight, which is crucial for its growth and survival. Understanding auxin's functions is essential in botany, as it highlights how plants interact with their environment.
The _____ is the shortest pathway for an impulse to travel from the receptor organ to the effector.- a)Reflex Arc
- b)Nervous System
- c)Neuron
- d)Neurotransmitter
Correct answer is option 'A'. Can you explain this answer?
The _____ is the shortest pathway for an impulse to travel from the receptor organ to the effector.
a)
Reflex Arc
b)
Nervous System
c)
Neuron
d)
Neurotransmitter
|
|
Nk Classes answered |
The Reflex Arc is the shortest pathway for an impulse to travel from the receptor organ via the central nervous system to the effector, allowing for quick and automatic reactions to stimuli, such as pulling back from something hot.
Which mechanism helps regulate hormone secretion in response to changes in the body's internal environment?- a)Homeostasis
- b)Feedback systems
- c)Enzyme activity
- d)Neural impulses
Correct answer is option 'B'. Can you explain this answer?
Which mechanism helps regulate hormone secretion in response to changes in the body's internal environment?
a)
Homeostasis
b)
Feedback systems
c)
Enzyme activity
d)
Neural impulses
|
|
Kamna Science Academy answered |
- Feedback systems are essential for regulating hormone secretion, ensuring that hormones are released in the precise amounts needed for proper bodily function.
- These systems react to fluctuations in the body's internal environment, such as blood sugar levels.
- For example, when blood sugar rises, the pancreas increases insulin production, and when levels drop, insulin secretion is decreased.
- This dynamic regulation helps maintain homeostasis, which is the body's state of stable internal conditions.
- An interesting fact is that the feedback mechanism can be classified as either negative or positive, with negative feedback being the most common in hormonal regulation, as it opposes changes to maintain balance.
What type of movement occurs in plants that is independent of growth?- a)Phototropism
- b)Geotropism
- c)Rapid leaf folding in sensitive plants
- d)Hydrotropism
Correct answer is option 'C'. Can you explain this answer?
What type of movement occurs in plants that is independent of growth?
a)
Phototropism
b)
Geotropism
c)
Rapid leaf folding in sensitive plants
d)
Hydrotropism
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Kamna Science Academy answered |
- The type of movement that occurs in plants and is independent of growth is exemplified by the rapid leaf folding in sensitive plants, often referred to as the "Touch-me-not" plant.
- This movement is an immediate response to stimuli, specifically touch, and does not involve growth processes.
- Interestingly, while animals use a nervous system to respond to stimuli, plants rely on electrical-chemical signals and changes in cell water content to facilitate such movements.
- This unique mechanism showcases the adaptability of plants in interacting with their environment.
What hormone is produced by the pancreas that helps regulate blood sugar levels?- a)Thyroxine
- b)Adrenaline
- c)Insulin
- d)Testosterone
Correct answer is option 'C'. Can you explain this answer?
What hormone is produced by the pancreas that helps regulate blood sugar levels?
a)
Thyroxine
b)
Adrenaline
c)
Insulin
d)
Testosterone
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EduRev Class 10 answered |
- The pancreas produces insulin, which plays a crucial role in regulating blood sugar levels by facilitating the uptake of glucose into the cells.
- This is essential for maintaining energy balance in the body.
- An interesting fact about insulin is that its discovery in 1921 revolutionized the treatment of diabetes, transforming it from a fatal disease to a manageable condition with proper care.
Choose the correctly matched pair.- a) Pituitary Gland - Thyroxine
- b) Thyroid Gland - Insulin
- c) Pancreas - Glucagon
- d) Adrenal Gland - Melatonin
Correct answer is option 'C'. Can you explain this answer?
a)
Pituitary Gland - Thyroxine
b)
Thyroid Gland - Insulin
c)
Pancreas - Glucagon
d)
Adrenal Gland - Melatonin
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Nk Classes answered |
Let's analyze each option to determine which pair is correctly matched:
- Option A: (a) Pituitary Gland - Thyroxine
- This is incorrect. The Pituitary gland secretes Growth Hormone (GH), not Thyroxine. Thyroxine is secreted by the Thyroid gland.
- Option B: (b) Thyroid Gland - Insulin
- This is incorrect. The Thyroid gland secretes Thyroxine, not Insulin. Insulin is secreted by the Pancreas.
- Option C: (c) Pancreas - Glucagon
- This is correct. The Pancreas secretes both Insulin and Glucagon, which regulate blood sugar levels.
- Option D: (d) Adrenal Gland - Melatonin
- This is incorrect. The Adrenal glands secrete Adrenaline, not Melatonin. Melatonin is secreted by the Pineal gland.
Hence, the correctly matched pair is Option C: (c) Pancreas - Glucagon.
Choose the correctly matched pair.- a)Cytokinins - Inhibit growth
- b)Auxin - Promotes cell division
- c)Gibberellin - Growth of stem
- d)Abscisic Acid - Promotes cell division
Correct answer is option 'C'. Can you explain this answer?
a)
Cytokinins - Inhibit growth
b)
Auxin - Promotes cell division
c)
Gibberellin - Growth of stem
d)
Abscisic Acid - Promotes cell division
|
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EduRev Class 10 answered |
- Option A: (a) Cytokinins - Inhibit growth
- Cytokinins actually promote cell division and are found in higher concentrations in fruits and seeds. Therefore, this pair is incorrectly matched.
- Option B: (b) Auxin - Promotes cell division
- Auxin is primarily responsible for promoting cell elongation, especially at the shoot tip, and is involved in phototropism. It does not primarily promote cell division. Therefore, this pair is incorrectly matched.
- Option C: (c) Gibberellin - Growth of stem
- Gibberellins are hormones that indeed promote the growth of the stem. Therefore, this pair is correctly matched.
- Option D: (d) Abscisic Acid - Promotes cell division
- Abscisic Acid is known for inhibiting growth and causing the wilting of leaves. It is also known as the stress hormone. Therefore, this pair is incorrectly matched.
- Hence, the correctly matched pair is Option C: (c) Gibberellin - Growth of stem.
What is the primary function of Gibberellin in plants?- a)Inhibiting growth
- b)Promoting cell division
- c)Stimulating root growth
- d)Assisting stem growth
Correct answer is option 'D'. Can you explain this answer??
a)
Inhibiting growth
b)
Promoting cell division
c)
Stimulating root growth
d)
Assisting stem growth
|
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Arjun Singh answered |
Understanding Gibberellin
Gibberellins are a group of plant hormones that play a crucial role in various growth processes. Their primary function is significantly related to stem growth.
Key Functions of Gibberellins:
- Stimulating Stem Elongation: Gibberellins promote cell elongation, particularly in stems, leading to increased height and overall growth of the plant. This process is essential for plants to reach light and optimize photosynthesis.
- Promoting Cell Division: While gibberellins do influence cell division, their primary role centers on elongation rather than dividing cells. This is why their effect is more pronounced in stems.
- Enhancing Germination: Gibberellins play a pivotal role in seed germination. They break dormancy and initiate the growth process by stimulating enzymes that mobilize stored food in seeds.
- Influencing Flowering: Some gibberellins can also affect flowering processes, particularly in certain plants that require specific conditions to bloom.
In Summary:
Gibberellins are primarily involved in:
- Promoting stem growth and elongation, allowing plants to achieve greater heights.
- Supporting other growth processes, but their most notable function is in enhancing stem development.
Thus, option 'D'—assisting stem growth—accurately describes the primary function of gibberellins in plants, distinguishing them from other growth hormones that may inhibit growth or focus on root development.
Gibberellins are a group of plant hormones that play a crucial role in various growth processes. Their primary function is significantly related to stem growth.
Key Functions of Gibberellins:
- Stimulating Stem Elongation: Gibberellins promote cell elongation, particularly in stems, leading to increased height and overall growth of the plant. This process is essential for plants to reach light and optimize photosynthesis.
- Promoting Cell Division: While gibberellins do influence cell division, their primary role centers on elongation rather than dividing cells. This is why their effect is more pronounced in stems.
- Enhancing Germination: Gibberellins play a pivotal role in seed germination. They break dormancy and initiate the growth process by stimulating enzymes that mobilize stored food in seeds.
- Influencing Flowering: Some gibberellins can also affect flowering processes, particularly in certain plants that require specific conditions to bloom.
In Summary:
Gibberellins are primarily involved in:
- Promoting stem growth and elongation, allowing plants to achieve greater heights.
- Supporting other growth processes, but their most notable function is in enhancing stem development.
Thus, option 'D'—assisting stem growth—accurately describes the primary function of gibberellins in plants, distinguishing them from other growth hormones that may inhibit growth or focus on root development.
What involuntary actions are controlled by the Medulla in the hindbrain?- a)Regulation of respiration
- b)Control of posture and balance
- c)Precision of voluntary actions
- d)Reflex movements of head, neck, and trunk
Correct answer is option 'A'. Can you explain this answer??
a)
Regulation of respiration
b)
Control of posture and balance
c)
Precision of voluntary actions
d)
Reflex movements of head, neck, and trunk
|
|
Sanaya sharma answered |
Involuntary Actions Controlled by the Medulla
The medulla oblongata is a crucial part of the hindbrain, responsible for regulating several vital involuntary actions essential for survival.
Regulation of Respiration
- The medulla plays a key role in controlling the rhythm and rate of breathing.
- It contains respiratory centers that send signals to the diaphragm and intercostal muscles, facilitating inhalation and exhalation.
- It responds to changes in carbon dioxide and oxygen levels in the blood, ensuring the body's respiratory needs are met.
Other Functions of the Medulla
- While respiration is a primary function, the medulla also regulates:
- Heart rate: It influences cardiac function by controlling the autonomic nervous system.
- Blood pressure: It helps in maintaining blood pressure through vasomotor control.
- Reflex actions: The medulla is involved in reflexes such as coughing, sneezing, and swallowing.
Why Other Options Are Incorrect
- Control of Posture and Balance: This function is primarily managed by the cerebellum, which coordinates muscle movements and maintains balance.
- Precision of Voluntary Actions: The motor cortex and basal ganglia are responsible for the precision and coordination of voluntary movements, not the medulla.
- Reflex Movements of Head, Neck, and Trunk: While the medulla does play a role in some reflex actions, it is not the primary center for all reflex movements of the head, neck, and trunk, which involve different neural pathways.
Conclusion
In summary, the medulla oblongata’s primary involuntary action is the regulation of respiration, making option 'A' the correct answer. Its role in maintaining vital functions is essential for life.
The medulla oblongata is a crucial part of the hindbrain, responsible for regulating several vital involuntary actions essential for survival.
Regulation of Respiration
- The medulla plays a key role in controlling the rhythm and rate of breathing.
- It contains respiratory centers that send signals to the diaphragm and intercostal muscles, facilitating inhalation and exhalation.
- It responds to changes in carbon dioxide and oxygen levels in the blood, ensuring the body's respiratory needs are met.
Other Functions of the Medulla
- While respiration is a primary function, the medulla also regulates:
- Heart rate: It influences cardiac function by controlling the autonomic nervous system.
- Blood pressure: It helps in maintaining blood pressure through vasomotor control.
- Reflex actions: The medulla is involved in reflexes such as coughing, sneezing, and swallowing.
Why Other Options Are Incorrect
- Control of Posture and Balance: This function is primarily managed by the cerebellum, which coordinates muscle movements and maintains balance.
- Precision of Voluntary Actions: The motor cortex and basal ganglia are responsible for the precision and coordination of voluntary movements, not the medulla.
- Reflex Movements of Head, Neck, and Trunk: While the medulla does play a role in some reflex actions, it is not the primary center for all reflex movements of the head, neck, and trunk, which involve different neural pathways.
Conclusion
In summary, the medulla oblongata’s primary involuntary action is the regulation of respiration, making option 'A' the correct answer. Its role in maintaining vital functions is essential for life.
How does the central nervous system (CNS) contribute to control and coordination in the body?- a)By regulating digestion and nutrient absorption
- b)By facilitating communication between the brain and muscles for movement
- c)By controlling heart rate and blood pressure
- d)By filtering toxins from the bloodstream
Correct answer is option 'B'. Can you explain this answer?
How does the central nervous system (CNS) contribute to control and coordination in the body?
a)
By regulating digestion and nutrient absorption
b)
By facilitating communication between the brain and muscles for movement
c)
By controlling heart rate and blood pressure
d)
By filtering toxins from the bloodstream
|
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Nk Classes answered |
The central nervous system (CNS), consisting of the brain and spinal cord, is responsible for processing information and sending signals to control movement, coordination, and response to stimuli. It plays a crucial role in motor control by transmitting signals between the brain and muscles, allowing for voluntary and involuntary movements.
The _______ gland is known as the master gland because it controls the secretions of all the other endocrine glands.- a)Thyroid
- b)Adrenal
- c)Pituitary
- d)Pancreas
Correct answer is option 'C'. Can you explain this answer?
The _______ gland is known as the master gland because it controls the secretions of all the other endocrine glands.
a)
Thyroid
b)
Adrenal
c)
Pituitary
d)
Pancreas
|
|
Nk Classes answered |
The pituitary gland, often referred to as the master gland, regulates the functions of other endocrine glands and is crucial for maintaining hormonal balance in the body. Its ability to control various hormones makes it a key player in the endocrine system.
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