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

Define Niche. 

What is population interaction? Explain the interactions in Mutualism and Competition.

What is the role of a probe in recombinant DNA technology?

Mention the scientific name of protozoan parasite that causes Amoebiasis.

The diagram given below shows the life cycle of a malarial parasite. Study it carefully and answer the questions that follows:

1. Name the hosts in which the asexual phase and sexual phase of the life cycle takes place.
2. Identify the infective stage labelled ‘D’.
3. Name the structure labelled ‘A’ and ‘E’.
4. Give any one symptom of malaria.

Some orchids live on the branches of mango trees. Name the type of interaction that exists between the mango tree and the orchid.

Give the name of the target pest of gene cry 1 Ac.

Assertion: E. coli was transformed by inserting the foreign DNA by using Pvul in pBR322.

Reason: It was done to make the transformed cells survive in the culture medium containing ampicillin.

What happens to an inferior competitor if a superior competitor is present in the same environment?

What happens to an inferior competitor if the superior competitor is removed from the environment?

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.

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 the steps involved in the process of plant breeding.

Expand the following abbreviation MTP.

Give reasons for the following:

Testes descend into the scrotum before birth.