Question

46. Which of the following is not a method by which sensory receptors receive
information about the internal or external
environments?
a) Changes in pressure
b) Light or heat changes
c) Changes in molecular concentration
d) All of these are used by sensory receptors
47. The ear detects sound by the movement
of which of the following organ?
a) The basilar membrane
b) The tectorial membrane
c) The Eustachian tube
d) Fluid in semicircular canals
48. Eutherian mammals are:
Oviparous b) Viviparous
c) Ovo-viviparous d) All of these
49. When cleavage furrow bisects both the
poles passing through centre of the egg
and median axix runs between centres of
animal pole and vegetal pole, it is called?
a) Meridonial plane of cleavage
b) vertical plane of cleavage
c) Equatorial plane of cleavage
d)latitudinal plane of clevage​

Answer 1

46 ka d
47 ka c
48 ka d
49 ka a

Answer 2

Answer:

Explanation:

The answers of the given questions are following - Changes in pressure, light or heat changes and changes in molecular concentration are used by the sensory receptors. Hence the answer of the question no. 46 is D.

The ear detects sound by the movement of The Eustachian tube of the following organs. Hence the answer of 47 is C. Eutherian mammals are oviparous, viviparous and ovo-viviparous. Hence the answer of 48 is D. When cleavage furrow bisects both the poles passing through centre of the egg and median axis runs between centres of animal pole and vegetal pole, it is called Meridonial plane of cleavage. Hence the answer of 49 is A.