Question 7
Which of the following statements are true about the brain?

(i) The main thinking part of the brain is hindbrain.

(ii) Centers of hearing, smell, memory, sight, etc. are located in the forebrain.

(iii) Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hindbrain.

(iv) Cerebellum does not control posture and balance of the body.

(a) (i) and (ii)
(b) (i), (ii) and (iii)
(c) (ii) and (iii)
(d) (iii) and (iv)

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Solution

(c) (ii) and (iii)

The forebrain is the main thinking part of the brain. It has regions which receive sensory impulses from various receptors. Separate areas of the forebrain are specialised for hearing, smell, sight and so on. Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hindbrain.The cerebellum controls posture and balance of the body (responsible for skilled memory).

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Match the following:

$\begin{matrix} 1. T h i s p a r t o f t h e b r a i n t e l l s u s & (i) C e r e b e l l u m w h e t h e r w e a r e h u n g r y o r f u l l 2. T h i s p a r t o f t h e b r a i n i s r e s p o n s i b l e & (i i) M e d u l l a f o r p r e c i s i o n o f v o l u n t a r y a c t i o n s 3. I n v o l u n t a r y a c t i o n s l i k e v o m i t i n g a n d s a l i v a t i o n & (i i i) F o r e - b r a i n a r e c o n t r o l l e d b y t h i s p a r t o f t h e b r a i n \end{matrix}$

Match the following:

Complete the following statements by choosing the correct alternative from the choices given in brackets :

(a) The dorsal root ganglion of the spinal cord contains cell bodies of (motor/sensory/intermediate) neurons.

(b) The cerebellum is the part of the brain which is responsible for

(i) conducting reflexes in the body

(ii) maintaining posture and equilibrium

(iii) controlling thinking, memory & reasoning.

(i) brain (ii) spinal cord

(iii) autonomic (iv) peripheral nervous system.

Which of the following statements regarding the given figure of the human brain is correct?

(i) Labelled part a is involved in the control of blood pressure, salivation and vomiting.
(ii) Labelled part b is responsible for the precision of voluntary actions and maintaining the posture and balance of the body.
(iii) The part labelled c is responsible for the change in the size of the pupil and activity like walking in a straight line.
(iv) The secretions part labelled d is responsible for the functioning of the hypothalamus.
(v) The part labelled e receives and integrates signals from the spinal cord.

Question 8
Which of the following types of muscle are involuntary?
(i) Striated muscle
(ii) Smooth muscle
(iii) Cardiac muscle
(iv) Skeletal muscle

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

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Central Nervous System

Standard X Biology

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