CBSE Class 12 Biology Sample Papers

Marks: 25
Duration: 1 hour

Section A: Each Question Carries 1 Mark

Question 1: Define the term parasitism?

Question 2: If a double stranded DNA has 20 per cent of Guanine, calculate the percent of adenine in the DNA

Question 3: What is palindromic sequence?

Section B: Each Question Carries 2 Mark

Question 1: An angiospermic plant has 16 diploid numbers of chromosomes. Mention the number of chromosomes in antipodal cells and endosperm?

Question 2: What is triple fusion?

Question 3: What are sexually transmitted diseases (STDs)? How one could be free of these infections?

Question 4: What is vegetative propagation? Give an example?

Section C: Each Question Carries 3 Mark

Question 1: What is spermatogenesis? Briefly describe the process of spermatogenesis.

Question 2: India population is increasing drastically. Suggest various birth control methods to prevent population explosion?

Section D: Each Question Carries 4 Mark

Question 1: Define the following terms

a. Out breeding and inbreeding
b. Artificial insemination
c. Micro-propagation
d. Mutational breeding

Question 2: What is global warming? Describe the causes and effects of global warming? What are the essential measures need to be taken to prevent global warming?