List of top Questions asked in CBSE Compartment XII- 2025

Which scientist proposed that “embryo never pass through the adult stages of other animals”?

They are useful to get rid of aphids.

What is the correct name of AI technique in assisted reproductive technologies?

Which one of the following transgenic animals is being used to test the safety of the polio vaccine?

Restriction Endonuclease – Hind II always cuts DNA molecules at a particular point by recognising a specific sequence of:

Which scientist proposed that "embryo never pass through the adult stages of other animals"?

The flows of genetic information in central dogma are in which direction?

The type of bond represented by the dotted line ‘------’ in a schematic polynucleotide chain is:

In which of the following conditions/diseases is there a substantial increase in the activity of mast cells observed in the human body?

Lactobacillus} that sets milk into curd is categorised as:

Select the incorrect} match from the following:

You know that there are twenty different types of naturally occurring amino acids and four different types of bases in the DNA. A combination of 3 such bases code for a specific amino acid. If instead there are 96 different amino acids and 12 different bases in the DNA, then the minimum number of combination of bases required to form a codon is:

Assertion (A): Biotechnology produces transgenic micro-organisms that act as microfactories for proteins.
Reason (R): To produce proteins for human use like insulin, transgenic microorganisms can be developed.

Assertion (A): Gross primary productivity is always less than net primary productivity.
Reason (R): Rate of synthesis of organic matter by consumers is known as secondary productivity.

Assertion (A): Streptococcus pneumoniae} and Haemophilus influenzae} are responsible for causing infectious diseases in human beings.
Reason (R): A healthy person acquires the infection by inhaling the droplets/aerosols released by an infected person.