List of top Questions asked in CBSE CLASS XII

Draw a labelled diagram showing the different embryonic stages of a dicot plant, up to a fully mature embryo.
Write the symptoms of malaria in humans and explain what causes these symptoms.
Which one of the two curves is more “realistic” and why?
‘A proper understanding of the menstrual cycle can help immensely in family planning.’ Do you agree with the statement? Provide reasons for your answer.
Whose skulls ‘A’, ‘B’, and ‘C’ are shown below? Which of the two are more similar to each other?
Identify the growth curves ‘A’ and ‘B’.
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 the (i) ape-like (ii) man-like primates that existed 1.5 million years ago.
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.
Mention what does the dotted line in the graph indicate and state its importance also.
Write the number of RNA polymerases involved in the transcription of DNA in a prokaryote and eukaryotes.
Studying Diseases:
Production of Biological Products:
How are such drugs consumed?
Chemical Safety Testing:
Name ‘A’ and ‘B’ fragments.
Name the human body organ affected by the consumption of these drugs.
Write the ‘palindrome’ recognized by EcoRI.
Where does EcoRI cut the palindrome? Write the events followed thereafter to form a recombinant DNA.
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 any two hotspots in India.
Differentiate between grazing food chain and detritus food chain.
Name the group of drugs whose skeletal molecule is shown below:
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).
Explain Brood parasitism with the help of a suitable example.