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

 Define the Standing crop.

What are the vestigial organs?

Give any one example of a vestigial organ in human body.

Based on the table given below, identify the type of natural selection taking place.

Assertion: Lymphocytes originate and proliferate in primary lymphoid organs.

Reason: Spleen is a secondary lymphoid organ.

Expand the abbreviation MALT.

Given below are the features of Seed A and Seed B. Study them carefully and answer the question that follows.

Identify the type of Seed A and Seed B. Cite one example of each of Seed A and Seed B.

Define the Stenothermal organisms.

Define Niche. 

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

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.

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?

What are introns?

Transcription is the transfer of genetic code from a DNA molecule to:
(i) RNA molecule
(ii) Second DNA molecule
(iii) Ribosomal sub unit·
(iv) Sequence of amino acids in a protein molecule

Mention one significant difference between Hormones of ovulatory phase and hormones of luteal phase

Give a significant point of difference between the oestrous and menstrual cycles.

Define Amenorrhea