Last five years board exam bio question papers

CBSE Class 12 Biology – Question 11 (Last 5 Years)

2024:
EcoRI cuts the DNA between bases G and A only when the sequence GAATTC is present. The number of nucleotides present in the resultant sticky ends that will be formed in each of the two strands of DNA after this enzyme cuts the DNA will be:
A) 1 & 5
B) 2 & 4
C) 2 & 5
D) 3 & 4

2023:
What are the functions of mitochondria and chloroplast in a cell?

2022:
Explain the process of transcription in protein synthesis.

2021:
Describe the structure and function of the human heart.

2020:
What is the role of DNA polymerase during DNA replication?

ISC Class 12 Biology – Question 11 (Last 5 Years)

2024:
Suneeta is planning an experiment to clone a gene in a vector. She has to choose a good cloning vector. Which one of the vectors shown below should she choose? Justify your answer by giving two reasons.
(Note: This question is based on a figure of vectors.)

2023:
Explain the role of enzymes involved in the digestion of carbohydrates.

2022:
Draw and label the structure of a nucleotide.

2021:
Write a note on the importance of biodiversity conservation.

2020:
Describe the mechanism of photosynthesis.