ISC (Science) ISC Class 12 - CISCE Question Bank Solutions

Name a plant which flowers every twelve years.

Name the terminal stage of ageing in the life cycle of plants.

Give a reason for the Following:

Pollen grains of wind-pollinated flowers are produced in large quantities.

Give the biological name of the following:

The mould from which penicillin is obtained.

Explain the different types of endosperms in angiosperms. 

Why are some molecules called bioactive molecules?

Mention the respective source and state the specific use of any two bioactive molecules.

Draw a labelled diagram of L.S. of human testis.

Define Spermatogenesis.

Define Reproductive health

Mention the location and the function of Leydig cells.

Explain the steps involved in the process of plant breeding.

Expand the following abbreviation MTP.

Study the graph given below and answer the following questions:

1. Explain the ecological principle represented by the graph and write a mathematical expression for the same.
2. What will happen if the slope of the line ‘b’ becomes steeper?

Explain how insulin can be produced using recombinant DNA technology.

Give reasons for the following:

Testes descend into the scrotum before birth.

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?