JAC Class 12 Biology Question Paper 2012 with Solution

About this paper

This is the Jharkhand Academic Council (JAC) Class 12 Biology paper from the 2012 board examination, with a worked answer under every question. It is split into a Botany part and a Zoology part, and each has four groups: five multiple-choice questions, four very short answers, four short answers and two long answers, each long answer with an 'Or' alternative. The Botany part prints its group marks as 1 × 5, 2 × 4 and 3 × 4; total marks and time are not printed. Many answers come with labelled diagrams, including the pBR322 cloning vector, double fertilisation, the DNA double helix and oogenesis, and one long answer works through monohybrid and dihybrid crosses.

Exam

JAC Class 12

Subject

Biology

Year

2012

Pages

4

Answers included

Yes

Paper pattern

• Group A

  5 marks

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

• Group B

  8 marks

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

• Group C

  12 marks

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

• Group D

  Questions 14–15 in each part: long answers, each with an 'Or' alternative

Topics covered

• Mendel's laws of inheritance
• Chromosomal theory of inheritance
• Plant breeding and tissue culture
• Biotechnology tools and pBR322
• Double fertilisation and fruit development
• Evolution and Darwinism
• DNA structure and replication
• Human reproduction and oogenesis
• Sex-linked inheritance
• Immunity and drug abuse
• Ecosystem and ecological pyramids
• Greenhouse effect and wildlife conservation laws

Questions from this paper

1. Mention Mendel's advantages in selecting the pea plant for his experiments.
2. What do you understand by double fertilisation? Give its significance.
3. What are the important abiotic components of a pond ecosystem? How do they regulate the pond ecosystem?
4. Haemophilia victims are mostly men, and women are very rarely affected by this defect. Why is it so?
5. Can a drug addict be made to lead a normal life? Suggest the various steps of change in everyday life.
6. Define oogenesis and describe the process of oogenesis with a suitable diagram.