ISC (Science) ISC Class 12 - CISCE Question Bank Solutions for Biology (Theory)

List any three major causes of loss of biodiversity.

Name any two factors responsible for the loss of biodiversity in a geographical region.

Write a brief note on the causes of infertility.

Give reasons for the following:

Nitrogenous fertilizers are not applied in fields where leguminous crops grow.

Expand the following: 

ZIFT

Give four causes of infertility in males.

Why are the spores of Bacillus thuringiensis used as bioinsecticide?

Give the biological name of the following:

The microbe used to control insect larvae growing on cotton.

Give the biological name of the following:

The fungus that is being developed as a bio-control agent.

Write the long form of GIFT.

Give a term for the following:

An ART in which eggs are removed from the ovary of the female, fertilised and then placed in her fallopian tube.

Name any two Cu-ions releasing IUDs.

Explain any two ways by which IUDs devices act as contraceptives.

Which one of the following choices reflects the correct number of chromosomes in the zygote and in the second polar body of Drosophila melanogaster?

Why are the biocontrol agents preferred over the chemical pesticides?

Explain how insulin can be produced using recombinant DNA technology.

State the best-known contribution of P.K. Sethi

In humans, somatic gene therapy was carried out to correct an immunodeficiency disease. Name this disease.

Give a reason for the following:

Streptokinase is administered to the patients having myocardial infarction.

The diagram given below represents the schematic structure of proinsulin, which undergoes certain modifications before it becomes a fully functional insulin.

Study the diagram carefully and answer the questions that follow:

1. State the change the proinsulin undergoes to become fully functional.
2. Name the modern scientific technique used for the production of human insulin.
3. How are the two polypeptide chains of the fully functional insulin held together?