JAC Class 12 Biology Question Paper 2020 with Solution

About this paper

This is the Jharkhand Academic Council (JAC) Class 12 Biology paper from the 2020 board examination, with answers given under each question. It is in two sections, Botany (Questions 1–18) and Zoology (Questions 19–36), each carrying 35 marks with 11½ pass marks, and the time allowed is 3 hours. Each section has ten one-mark multiple-choice questions, three two-mark very short answers, three three-mark short answers and two five-mark long answers with 'Or' alternatives. Diagram work includes the DNA double helix, the 7-celled embryo sac, an energy pyramid with labels to fill in and the human sperm. One printed answer is wrong: mycorrhiza is marked as parasitism rather than mutualism.

Exam

JAC Class 12

Subject

Biology

Year

2020

Maximum marks

70

Time allowed

3 hours

Questions

36

Pages

5

Answers included

Yes

Paper pattern

• Section A (Botany)

  35 marks

  Questions 1–18: 10 multiple-choice (1 mark each), 3 very short answers (2 marks each), 3 short answers (3 marks each) and 2 long answers (5 marks each) with 'Or' alternatives

• Section B (Zoology)

  35 marks

  Questions 19–36: 10 multiple-choice (1 mark each), 3 very short answers (2 marks each), 3 short answers (3 marks each) and 2 long answers (5 marks each) with 'Or' alternatives

Topics covered

• Reproduction in flowering plants
• Principles of inheritance and variation
• Molecular basis of inheritance
• Restriction enzymes and genetic engineering
• Biofortification and Bt toxin
• Evolution
• Human reproduction
• Reproductive health and amniocentesis
• Human health and disease
• Organisms and populations
• Ecosystem and ecological pyramids
• Greenhouse effect, global warming and ozone depletion

Questions from this paper

1. Define ecological succession.
2. What is a restriction enzyme? Give an example.
3. With a neat diagram, explain the development of the 7-celled, 8-nucleate female gametophyte in angiosperms.
4. What is global warming? Discuss its causes and effects, and the measures needed to control it.
5. Write the differences between spermatogenesis and oogenesis.
6. Write in detail the process of semiconservative replication of DNA.