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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 2025 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 2025 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 role of the hormone insulin released by the pancreas in the human body?

Detailed Solution for Test: Control & Coordination - 1 - Question 1
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 2

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 2
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 3

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 3

Plants do not have any nervous system, but 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, where the direction of response is not determined by the direction of the stimulus, is known as nastic movement. In sensitive plants like Mimosa pudica, this movement is achieved by changing cell shapes through altering the water content and turgor pressure within their cells, leading to the observed movement.

Test: Control & Coordination - 1 - Question 4
Which part of the brain is associated with controlling voluntary actions?
Detailed Solution for Test: Control & Coordination - 1 - Question 4
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 5
What is the function of the hindbrain's Cerebellum?
Detailed Solution for Test: Control & Coordination - 1 - Question 5
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 6
What is the major function of the Central Nervous System (CNS)?
Detailed Solution for Test: Control & Coordination - 1 - Question 6
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 7

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

Detailed Solution for Test: Control & Coordination - 1 - Question 7

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 8
What is the function of the reflex arc?
Detailed Solution for Test: Control & Coordination - 1 - Question 8
The reflex arc allows quick responses by directly connecting the sensory neurons to motor neurons, bypassing the brain for faster reaction to stimuli.
Test: Control & Coordination - 1 - Question 9
Which part of the human brain is responsible for maintaining posture and balance?
Detailed Solution for Test: Control & Coordination - 1 - Question 9
The cerebellum, located in the hindbrain, is responsible for maintaining posture and balance, and for the precision of voluntary movements.
Test: Control & Coordination - 1 - Question 10
What is the role of auxin in plants?
Detailed Solution for Test: Control & Coordination - 1 - Question 10
Auxin is a plant hormone that promotes cell elongation on the side of the plant away from the light, causing the plant to bend towards the light (phototropism).
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