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

Give a reason for the following:

DNA cannot enter directly into the host cell.

State the steps involved in the process of gene therapy for the treatment of ADA-deficiency.

Study the diagram given below and answer the questions that follow.

1. Name the cloning vector shown above. In which organism in this cloning vector inserted?

2. Mention any two restriction sites shown in the diagram.

3. Name any two selectable markers shown in the diagram.

Assertion: In a bioreactor, it is not necessary to maintain sterile ambience.

Reason: Sterile conditions promote the growth of unwanted microbes in the culture medium.

Suneeta is planning an experiment to clone a gene in a vector. So, she has to choose a good cloning vector.

Which one of the vectors shown below should she choose? Justify your answer by giving two reasons.

Vector A	Vector B	Vector C

David is a molecular biologist. He uses a technique to know the amino acids occupy the first and the last positions in the Chain - A and Chain - B of insulin. Name the scientist whose contribution made it possible for David to use this technique.

Give a reason for the following:

The diagram given below represents vector pBr322 which was modified by a research scholar Dr. Rayon, but the vector was rejected by his guide.

What is Red Data Book?

Give one significant contribution of the given scientist

E. Wilson

Define Hotspots.

Define Ramsar Sites.

Define Biodiversity.

Define Eutrophication.

Explain the rivet Popper hypothesis.

Define amniocentesis.

Give the biological name of the following: 

The microbe used to produce Swiss cheese.

Give the biological name of the following:

A symbiotic nitrogen-fixing bacterium found in root nodules.

Differentiate between the following:

Spermatogenesis and oogenesis

A homozygous pea plant with round seed coat and yellow cotyledons are crossed with another homozygous, pea plant having wrinkled seed coat and green cotyledons.

1. Give the types of gametes produced by plants of F-generation.
2. Give the dihybrid phenotypic ratio with the corresponding phenotypes.
3. State Mendel’s principle involved in this cross.

Expand the following abbreviation:

IUCD