11)

Which nerves transmit impulses from the cen¬tral nervous system towards muscle cells?

Class 10 Biology

A)

Sensory nerves

B)

Motor nerves

C)

Relay nerves

D)

Cranial nerves

12)

A microscopic gap between a pair of adjacent neurons over which nerve impulses pass is called

Class 10 Biology

A)

neurotransmitter

B)

dendrites

C)

axon

D)

synapse

13)

The highest coordinating centre in the human body is

Class 10 Biology

A)

spinal cord

B)

heart

C)

brain

D)

kidney

14)

Main function of cerebrum is

Class 10 Biology

A)

thinking

B)

hearing

C)

memory

D)

balancing

15)

 Posture and balance of the body is controlled by

Class 10 Biology

A)

Pons

B)

Medulla oblongata

C)

Cerebellum

D)

Cerebrum

16)

Breathing is controlled by which part of the brain?

Class 10 Biology

A)

Cerebrum

B)

Cerebellum

C)

Hypothalamus

D)

Medulla oblongata

17)

Which part of nervous system controls the reflex activities of the body?

Class 10 Biology

A)

Brain

B)

Spinal cord

C)

Cerebrum

D)

Cerebellum

18)

Which of the following acts as both endocrine and exocrine gland?

Class 10 Biology

A)

Pancreas

B)

Thyroid

C)

Adrenal

D)

Liver

19)

Identify which of the following statements about thyroxin is incorrect?

Class 10 Biology

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.

20)

Which gland secretes the growth hormone?

Class 10 Biology

A)

Pituitary gland

B)

Thyroid

C)

Hypothalamus

D)

Adrenal