Biology
Assertion (A): The cerebrum is the seat of intelligence, consciousness and will power. It controls all voluntary activities of the body.
Reason (R): Cerebrum is the largest portion of the brain which accomodates a large number of neurons. Hence, it controls all the internal and external activities of the body, whether voluntary or involuntary.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Nervous System
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Answer
A is true but R is false.
Reason — A is true as the cerebrum is responsible for intelligence, consciousness, will power, and it controls voluntary activities like movement, thinking, and decision-making.
R is false as although the cerebrum is the largest part of the brain and has many neurons, it does not control all activities.
Therefore, A is true but R is false is the correct option.
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Related Questions
Assertion (A): Nervous system and chemical coordination in human beings are functionally related to each other.
Reason (R): Nervous coordination is mainly regulated by brain, spinal cord, nerves and sense organs whereas chemical coordination is controlled by the chemical messengers called hormones. They both work in proper coordination.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): The terminal branches of the axon of one neuron lie very close to the dendrites of another neuron.
Reason (R): : If there were a big gap between the axon and dendrites of two connecting neurons, impulses or messages would not be transmitted from one part of the body to another.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Sympathetic and parasympathetic systems are the two parts of autonomic nervous system which are independent in their functioning and are not related to each other at all.
Reason (R): Both of these nervous systems are opposite in their actions. Sympathetic nervous system accelerates the actions while parsympathetic system relaxes them.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Match the terms given in column A with those of column B .
Column A Column B (i) Sensory neuron (a) Brain and spinal cord (ii) Motor neuron (b) Somatic and autonomic (iii) Central nervous system (c) Sympathetic and parasympathetic (iv) Peripheral nervous system (d) Sense organs (v) Autonomic nervous system (e) Effectors