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Test: Control & Coordination - 1 - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Control & Coordination - 1

Test: Control & Coordination - 1 for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: Control & Coordination - 1 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Control & Coordination - 1 MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Control & Coordination - 1 below.
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Test: Control & Coordination - 1 - Question 1

What is the function of the hormone melatonin produced by the pineal gland in the human body?

Detailed Solution for Test: Control & Coordination - 1 - Question 1
Melatonin, the hormone secreted by the pineal gland, is primarily known for its role in regulating sleep patterns. This hormone helps in controlling the circadian rhythm, the body's internal clock that dictates when we feel sleepy or awake. Melatonin levels typically rise in the evening, signaling the body that it is time to sleep, and decrease in the morning to promote wakefulness.
Test: Control & Coordination - 1 - Question 2

What is the role of the hormone insulin released by the pancreas in the human body?

Detailed Solution for Test: Control & Coordination - 1 - Question 2
Insulin, a hormone produced by the pancreas, plays a crucial role in regulating blood sugar levels in the body. It facilitates the uptake of glucose from the bloodstream into cells, thereby lowering blood sugar levels. Imbalances in insulin production or function can lead to conditions like diabetes mellitus, where blood sugar levels are not properly controlled. ---
Test: Control & Coordination - 1 - Question 3

What distinguishes plant hormones from hormones in animals in terms of their mode of transport within the organism?

Detailed Solution for Test: Control & Coordination - 1 - Question 3
Plant hormones are typically transported through specialized tissues like the xylem and phloem within the plant, aiding in long-distance communication. In contrast, animal hormones are primarily transported through the bloodstream or other bodily fluids, enabling them to reach target tissues and organs throughout the organism for various physiological responses.
Test: Control & Coordination - 1 - Question 4
Which plant hormone is responsible for promoting cell division and is found in greater concentrations in fruits and seeds?
Detailed Solution for Test: Control & Coordination - 1 - Question 4
Cytokinin is a plant hormone that plays a crucial role in promoting cell division. It is found in higher concentrations in fruits and seeds, contributing to growth and development in these plant parts. Cytokinins help regulate various physiological processes, including cell division, differentiation, and overall plant growth.
Test: Control & Coordination - 1 - Question 5

How do plants respond to stimuli despite the absence of a nervous system and muscles, such as in the case of a 'sensitive' plant?

Detailed Solution for Test: Control & Coordination - 1 - Question 5
  • Plants do not have any nervous system but yet if we touch a sensitive plant such as Mimosa pudica, the leaves of the plant close down. This is due to nastic movement.
  • The response of the plant parts in response to an external stimulus in which the direction of response is not determined by the direction of the stimulus is known as a nastic movement.
  • As plants do not have any nervous system they use chemical means for communication.
  • The chemical means involve plant hormones which help them to coordinate and communicate.
Test: Control & Coordination - 1 - Question 6
Which part of the brain is associated with controlling voluntary actions?
Detailed Solution for Test: Control & Coordination - 1 - Question 6
The Fore-brain, the most complex or specialized part of the brain, is primarily associated with controlling voluntary actions. It consists of the cerebrum, which plays a crucial role in decision-making, higher cognitive functions, motor coordination, and processing sensory information. The Fore-brain is integral to executing voluntary movements, such as intentional muscle actions and cognitive processes requiring conscious control.
Test: Control & Coordination - 1 - Question 7
What is the function of the hindbrain's Cerebellum?
Detailed Solution for Test: Control & Coordination - 1 - Question 7
The Cerebellum, a part of the hindbrain, is responsible for controlling posture and balance. It plays a key role in facilitating the precision of voluntary actions, such as maintaining equilibrium, coordinating movements, and ensuring smooth motor functions. Additionally, the Cerebellum contributes to fine-tuning motor skills and adjusting body movements to achieve stability and coordination.
Test: Control & Coordination - 1 - Question 8
What is the major function of the Central Nervous System (CNS)?
Detailed Solution for Test: Control & Coordination - 1 - Question 8
The major function of the Central Nervous System (CNS) is to receive data from the body and send instructions to specific organs. This vital system, comprising the brain and spinal cord, plays a crucial role in processing sensory information, coordinating responses, and regulating various bodily functions. The CNS acts as the command center of the body, integrating sensory inputs and initiating appropriate motor responses.
Test: Control & Coordination - 1 - Question 9

Which is the correct sequence of the components of a reflex arc?

Detailed Solution for Test: Control & Coordination - 1 - Question 9
Correct Sequence of Components of a Reflex Arc

  • Receptors: These are specialized structures that detect stimuli and convert them into electrical signals.

  • Sensory neuron: The electrical signals generated by receptors are transmitted to the central nervous system (CNS) via sensory neurons.

  • Spinal cord: In the spinal cord, the sensory signals are processed and a response is generated.

  • Motor neuron: The response signal is then transmitted from the CNS to the effector organ (muscle or gland) via motor neurons.

  • Muscle: The effector organ (muscle) receives the signal and produces a response, such as contracting in the case of a muscle reflex.


Therefore, the correct sequence of the components of a reflex arc is: Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle.

Test: Control & Coordination - 1 - Question 10

Select the mis-matched pair from the following :

Detailed Solution for Test: Control & Coordination - 1 - Question 10

Thyroxin is secreted by thyroid gland. Testes secrete male hormone testosterone.

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