STD 12 - 7. human health and disease — NEET STD 11 Science — Question

Assertion: Fibrous joints do not allow any movement.
Reason: This type of joint is shown by the flat skull bones.

During hibernation, frog respires with

Which of the following statements regarding mutation are correct ?
(i) Mutation is a phenomenon which results in alteration of DNA sequences and consequently results in changes in the genotype and phenotype of an organism.
(ii) Gene/Point mutation is responsible for Sickle- cell anaemia.
(iii) Chromosomal mutation is responsible for Down's syndrome.
(iv) In addition to recombination, mutation is another phenomenon that leads to variation in DNA.
(v) Chromosomal aberrations are commonly observed in cancer cells.
(vi) Deletions of base pairs of DNA, causes frame- shift mutations but not by insertion of base.

Cartilaginous fishes are characterised by the presence of

Micturition is

Which one of the following conditions correctly describes the manner of determining the sex?

Select the correct statement regarding Periplanata americana

A man whose blood group is not known meets with a serious accident and needs blood transfusion immediately, which one of the blood groups readily available in the hospital will be safe for transfusion?

Which of the following statements are incorrect regarding universe including earth ?
(i) The Big Bang theory attempts to explain to us the origin of universe.
(ii) The universe expanded and hence, the temperature came down. Hydrogen and Helium formed sometime later.
(iii) The gases condensed under gravitation and formed the galaxies of the present day universe.
(iv) There was no atmosphere on early earth.
(v) Water vapour, methane, carbon dioxide and ammonia released from molten mass covered the earth surface.
(vi) The UV rays from the sun brokeup water into Hydrogen and Oxygen and the lighter O₂, escaped.