JAC Class 12 Biology Question Paper 2013 with Solution

About this paper

This is the Jharkhand Academic Council (JAC) Class 12 Biology paper from the 2013 board examination, with answers given under each question. Section A is Botany and Section B is Zoology, and each follows the same four groups: five multiple-choice questions (1 × 5), four very short answers (2 × 4), four short answers (3 × 4) and two long answers (5 × 2), so each section carries 35 marks, as printed on the Zoology section. Every long answer has an 'Or' alternative, and one Zoology alternative is a four-part question on the placenta and pregnancy hormones. Time is not printed on this copy.

Exam

JAC Class 12

Subject

Biology

Year

2013

Pages

3

Answers included

Yes

Paper pattern

• Group A

  5 marks

  Questions 1–5 in each section: multiple choice, one mark each

• Group B

  8 marks

  Questions 6–9 in each section: very short answers, two marks each

• Group C

  12 marks

  Questions 10–13 in each section: short answers, three marks each

• Group D

  10 marks

  Questions 14–15 in each section: long answers, five marks each, each with an 'Or' alternative

Topics covered

• Plant breeding and the Green Revolution
• Reproduction in flowering plants
• Mendel's law of segregation
• DNA replication and nucleosome structure
• Biotechnology and recombinant insulin
• Ecosystem, food chains and the carbon cycle
• Environmental issues: smog, eutrophication and BOD
• Biodiversity loss
• Human genetic disorders
• Evolution and the Hardy–Weinberg principle
• Human reproduction and implantation
• Human health and disease

Questions from this paper

1. Name two harmful effects of smog on humans.
2. What are the benefits of biofertilisers?
3. What is a food chain? Describe the food chains of a grassland ecosystem.
4. What are the major causes of loss of biodiversity? Describe them in brief.
5. State the Hardy–Weinberg principle. What is its significance in evolution?
6. How did Hershey and Chase prove that DNA is the genetic material?