STD 11 - 18. Neural control and coordination — NEET STD 11 Science — Question

Serum differs from blood in

If myelin sheath is continued in myelinated nerve fibre then what will happen in neuronal conduction?

Given statements are characters of muscle, which of the following is correct for Visceral muscles or smooth muscles ?
(i) They do not exhibit any striation and are smooth in appearance. Hence, they are called non- striated muscle.
(ii) They have a striped appearance under the microscope and hence are called striated muscles.
(iii) As their activities are under the voluntary control of the nervous system, they are known as voluntary muscles too.
(iv) Their activities are not under the voluntary control of the nervous system and are therefore known as involuntary muscles.
(v) They are located in the inner walls of hollow visceral organs of the body like the alimentary canal, reproductive tract, etc.
(vi) They are primarily involved in locomotory actions and changes of body postures.
(vii) They assist in the transportation of food through the digestive tract and gametes through the genital tract.

Person whose father is colourblind marries a lady whose mother is daughter of a colourblind man. Their children will be

Assertion : Human ancestors never used their tails and so the tail expressing gene has disappeared in them.

Reason : Lamarck's theory of evolution is popularly called theory of continuity of germ plasm.

In a reaction catalyzed by an enzyme, which of the following statements is correct :

Inner surface of fallopian tubes, bronchi and bronchioles are lined by