List of top Biology Questions asked in CBSE CLASS XII

Which of the two curves is relevant in present days with respect to human population in our country and why?

Identify the growth curves ‘A’ and ‘B’.

Name the (i) ape-like (ii) man-like primates that existed 1.5 million years ago.

Whose skulls ‘A’, ‘B’, and ‘C’ are shown below? Which of the two are more similar to each other?

Mention what does the dotted line in the graph indicate and state its importance also.

Name this RNA product transcribed from the DNA that subsequently translates into a polypeptide of 400 amino acids. Mention the enzyme responsible for transcribing this type of RNA from the DNA.

Name and explain the process the RNA molecule transcribed from 8000 nucleotide-long DNA undergoes to be able to translate a polypeptide of 400 amino acids.

Production of Biological Products:

Name the human body organ affected by the consumption of these drugs.

Chemical Safety Testing:

Studying Diseases:

Where does EcoRI cut the palindrome? Write the events followed thereafter to form a recombinant DNA.

Write the ‘palindrome’ recognized by EcoRI.

Name ‘A’ and ‘B’ fragments.

How are such drugs consumed?

Draw a well-labelled diagram of the sectional view of a male gametophyte/microspore of an angiosperm and write the functions of any two parts labelled. (Any four labels).

Name any two hotspots in India.

Explain Brood parasitism with the help of a suitable example.

Study the graph given below that represents the changes in the thickening of the uterine wall in women ‘X’ and women ‘Y’ over a period of one month:
What does the graph with respect to women ‘X’ and woman ‘Y’ indicate? Give a suitable reason.

Name the group of drugs whose skeletal molecule is shown below:

Differentiate between grazing food chain and detritus food chain.

Assertion (A): Patents are granted by governments to an inventor.
Reason (R): Patents prevent others from commercial use of an invention.