Important Questions for Class 12 Biology

Important questions for class 12

Class 12 Biology students appearing for CBSE exams, we got your back, here are a few important questions for class 12. 

Important questions for class 12 as 1 marker

Q1. Write the scientific name of the plant that flowers once in twelve years?

Q2. Why do you think Mendel used a true breeding line of garden pea in his plants?

Q3. Write one structural difference between the human functional insulin and proinsulin?

Q4. Give an example of a chromosomal disorder caused due to non-disjunction of autosomes.

Q5. Write the function of a bioreactor.

Important questions for class 12 as 2 markers

Q1. How does an encysted Amoeba reproduce on return of favourable conditions?

Q2. What are gemmules and conidia? Name one organism each in which these are formed?

Q3. One of the salient features of the genetic code is that it is nearly universal from bacteria to humans. Mention two exceptions to this rule. Why are some codes said to be degenerate?

Q4. “Artificial insemination helps overcome several problems of normal matting in cattle.” Do you agree? Support your answer with any three reasons.

Q5. How is cancer treated by radiotherapy? Name any other two approaches for cancer treatment.

Important questions for class 12 as 3 markers

Q1. A woman with an O blood group marries a man with an AB blood group. Work out the cross to show possible phenotypes and genotypes of the progeny with respect to blood groups. Explain the pattern of inheritance observed in this cross.

Q2. State what is apomixis. Write its significance. How can it be commercially used?

Q3. “Bananas are often seedless but are always true fruits”. Justify the statement.

Q4. Difference between in-situ and ex-situ approaches for conserving biodiversity. Give an example for each.

Q5. How are competent bacteria transformed with recombinant DNA?

Important questions for class 12

Important questions for class 12 as 5 markers

Q1. Compare the processes of DNA replication and transcription in eukaryotes.

Q2. (a) Write two limitations of traditional breeding techniques that led to the promotion of micro-propagation.

(b) Mention two advantages of micro-propagation.

(c) Give two examples where it is commercially adopted.

(d) How are somatic hybrids obtained?

Q3. Differentiate between incomplete dominance and co-dominance. Support your answer with examples of each.

Q4. (a) If a patient is advised anti-retroviral drug, name the possible infection he/she is likely to be suffering from?  Name the causative organism.

(b) How do vaccines prevent subsequent microbial infection by the same pathogen?

(c) How does a cancerous cell differ from a normal cell?

(d) Many microbial pathogens enter the gut of humans along with food. Name the physiological barrier that protects the

body from such pathogens.

Q5. (a) Work out the cross upto F2 generation between true-breeding tall pea plants bearing violet flowers and dwarf pea plants bearing white flowers.

(b) Explain Mendel’s laws of segregation and independent assortment on the basis of the cross.

Practice like you have never won and perform like you have never lost!

Comment down your answers and queries.

Team MBD

Class 12th Biology Practical Experiments: Let’s go Bananas and extract it’s DNA – My Biology Dictionary

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Download NCERT books for class 12: NCERT

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