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

In vitro fertilisation is a technique that involves transfer of which one of the following into the fallopian tube?

The test-tube baby programme employs which one of the following techniques?

The first case of IVF-ET technique success, was reported by ______.

Which of the following is a non-medicated intrauterine device (IUD)?

The year 2003 was celebrated as the 50th anniversary of discovery of ______.

Chemically, RNA is (i) reactive and (ii) stable as compared to DNA.

In ET technique embryo is transferred into ______.

In which of the following ARTs, does in vivo fertilisation occur?

ZIFT is transfer of ______.

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?

Read the following and answer from given below:

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?

Read the following and answer from given below:

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?

Read the following and answer from given below:

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?

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.