List of top Questions asked in CBSE CLASS XII

Write the symptoms of malaria in humans and explain what causes these symptoms.
Which of the two curves is relevant in present days with respect to human population in our country and why?
Growth curve ‘B’ shows a different pattern from that of growth curve ‘A’. Justify giving one reason.
Identify the growth curves ‘A’ and ‘B’.
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 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.
Name the (i) ape-like (ii) man-like primates that existed 1.5 million years ago.
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.
Write the number of RNA polymerases involved in the transcription of DNA in a prokaryote and eukaryotes.
Where does EcoRI cut the palindrome? Write the events followed thereafter to form a recombinant DNA.
Name ‘A’ and ‘B’ fragments.
Name the human body organ affected by the consumption of these drugs.
Production of Biological Products:
Write the ‘palindrome’ recognized by EcoRI.
Studying Diseases:
Chemical Safety Testing:
How are such drugs consumed?
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.
Differentiate between grazing food chain and detritus food chain.
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.
Name the group of drugs whose skeletal molecule is shown below:
Explain Brood parasitism with the help of a suitable example.
Assertion (A): A given fig species can be pollinated only by its partner wasp.
Reason (R): The wasp pollinates the fig inflorescence while searching for suitable egg-laying sites.