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?

Give reasons for the following:

Testes descend into the scrotum before birth.

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?