STD 11 - 14. Breathing and exchange in gases — NEET STD 11 Science — Question

Which of the following characters for mollusca are correct ?
(i) Body have distinct head, muscular foot and visceral hump.
(ii) A soft and spongy layer of skin forms a mantle over the visceral hump.
(iii) The space between the head and the mantle is called the mantle cavity.
(iv) Mantle cavity have feather like gills which related with respiratory and excretory functions.
(v) The mouth contains a file-like rasping organ for feeding, called radula.
(vi) They are usually monoecious and oviparous with indirect development.

Reproductive health in society can be improved by
i. introduction of sex education in schools.
ii. increased medical assistance.
iii. awareness about contraception and STDs.
iv. equal opportunities to male and female child.
v. encouraging myths and misconceptions.

The animal in which sexes can be differentiated from external morphology is

Choose correct sentence (related frog).

Fertilisation in humans is practically feasible only if

Which one of the following pairs is incorrectly matched?

Mendel chose pea plants because

Assertion: Human heart is called myogenic.
Reason: The nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is autoexcitable and is responsible for maintaining the rhythmic contractile activity of the heart.

Which of the following is true of Aves?