Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Biology

Mark the odd one.

A cross is made between tall pea plants having green pods and dwarf pea plants having yellow pods. In the F2 generation, out of 80 plants how many are likely to be tall plants?

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Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are the two types of nucleic acids found in the living system. DNA acts as the genetic material in most organisms. Although RNA also acts as genetic material in some organisms.

In which of the following organisms, RNA acts as genetic material?

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Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are the two types of nucleic acids found in the living system. DNA acts as the genetic material in most organisms. Although RNA also acts as genetic material in some organisms.

What is the reason for the additional stability of DNA in comparison to RNA?

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Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are the two types of nucleic acids found in the living system. DNA acts as the genetic material in most organisms. Although RNA also acts as genetic material in some organisms.

Which of the following criteria a molecule must fulfill to act as genetic material?

C-peptide of human insulin is ______.

A probe which is a molecule used to locale-specific sequences in a mixture of DNA or RNA Mole cubs could be ______.

The site of production of ADA the body is ______.

A pathophysiology is the ______.

ADA is an enzyme which is deficient in a genetic disorder SCID. What is the full form of ADA?

Choose the correct option regarding retrovirus.

Give a schematic labelled diagram to represent oögenesis (without descriptions)

What are the changes in the oogonia during the transition of a primary follicle to Graafian follicle?

Mention the primary aim of the “Assisted Reproductive Technology” (ART) programme.

Males in whom testes fail to descend to the scrotum are generally infertile. Why?

Briefly explain IVF and ET What are the conditions in which these methods are advised?

What are the Assisted Reproductive Techniques practised to help infertile couples? Describe any three techniques.

What is the cross between the progeny of F₁ and the homozygous recessive parent called? How is it useful?

Name any three viruses which have RNA as the genetic material.

During the course of evolution why DNA was chosen over RNA as genetic material? Give reasons by first discussing the desired criteria in a molecule that can act as genetic material and in the light of biochemical differences between DNA and RNA.