CBSE 12 Biology Question Paper-2023 Set-2

A human male decides to adopt a surgical method for contraception. Identify the point in the diagram where a cut would be made and tied.

Choose the set of sex determining chromosomes that indicates the correct sex of the respective organism.

Given below is a list of steps Meselson and Stahl carried out in their experiment to prove that DNA replication is semi-conservative. Select the option that gives the correct sequence of steps followed by them. (i) Bacteria transferred to a N14 medium and sampled every 20 minutes. (ii) All bacteria contain hybrid DNA (N14DNA and N15DNA). (iii) Bacteria grown in N15 medium for many generations. (iv) All bacteria contain N15 DNA. (v) Bacteria contain either all N14 DNA or all hybrid DNA.

Identify the type of evolution shown in the diagram with two organisms, the mouse and the marsupial mouse, living in the same habitat in Australia.

The principle of gene therapy is to:

The principle of gene therapy is to:

Identify the vector used in gene therapy for Adenosine Deaminase (ADA) deficiency.

Given below are four organisms (A, B, C, D) along with their reproductive parts. Identify the correct combination of the organisms that can reproduce by sexual reproduction. A. Yeast B. Paramecium C. Planaria D. Hydra

Which of the following describes the correct path of a fertilised egg in the human female reproductive system?

A couple has three daughters. The probability of them having a boy as a fourth child is:

Which of the following is not a vestigial organ in humans?

The technique of growing plants in a nutrient solution, without soil, is known as:

When a DNA molecule with heavy nitrogen (N15) is replicated in a medium containing normal nitrogen (N14), what will be the composition of the DNA molecules after two generations?

Which of the following is an example of a co-dominant trait?

The first clinical gene therapy was given to a four-year-old girl with:

Which of the following is true with respect to the process of polymerisation of DNA?

Name the phase of cell cycle when DNA replicates:

Which of the following is an example of an incomplete dominant trait?

When a DNA molecule with heavy nitrogen (N15) is replicated in a medium containing normal nitrogen (N14), what will be the composition of the DNA molecules after two generations?

The principle of gene therapy is to:

A student finds a plant whose flowers are brightly coloured and fragrant, and which produces a large amount of nectar. The student can conclude that this plant is pollinated by:

A couple has three daughters. The probability of them having a boy as a fourth child is:

The technique of growing plants in a nutrient solution, without soil, is known as:

Which of the following is a vestigial organ in humans?

The first clinical gene therapy was given to a four-year-old girl with: