ISC 2018 Biology Solved Question Paper for Class 12

About this paper

This is a solved copy of ISC Class 12 Biology Paper 1 (Theory) from the 2018 board examination. It carries 70 marks, runs for three hours plus fifteen minutes of reading time, and has 18 compulsory questions. Part I is a 20-mark question of short answers, multiple-choice items, scientists' contributions, definitions and reasons. Part II is Section A (seven two-mark questions), Section B (seven three-mark questions) and Section C (three five-mark questions). Internal choices are given in two questions each in Sections A and B, and in every question of Section C. A written answer is printed after each question. These solutions are not an official CISCE marking scheme.

Exam

ISC Class 12

Subject

Biology

Year

2018

Maximum marks

70

Time allowed

3 hours + 15 min reading

Questions

18

Pages

15

Answers included

Yes

Paper pattern

• Part I

  20 marks

  Question 1, 20 marks: eight short answers, four multiple-choice items, four scientists' contributions, two definitions and two reasons

• Part II, Section A

  14 marks

  Questions 2–8, two marks each; internal choice in two questions

• Part II, Section B

  21 marks

  Questions 9–15, three marks each; internal choice in two questions

• Part II, Section C

  15 marks

  Questions 16–18, five marks each, each with an internal choice

Topics covered

• Human reproduction
• Human health and disease
• Sexual reproduction in flowering plants
• Principles of inheritance
• Molecular basis of inheritance
• Evolution
• Ecosystem
• Environmental issues
• Biodiversity and conservation
• Biotechnology and its applications
• Microbes in human welfare
• Reproductive health

Questions from this paper

1. Give a significant point of difference between the oestrous cycle and the menstrual cycle.
2. If the haploid number of chromosomes in a plant species is 20, how many chromosomes will be present in the cells of the shoot tip?
3. Name a plant which flowers every twelve years.
4. A woman with blood group O married a man with blood group AB. Show the possible blood groups of the progeny and list the alleles involved.
5. Define BOD and state its significance in an aquatic ecosystem.
6. Explain industrial melanism.