- Cleistogamous flowers are self-pollinated because
[Max Marks: 1 | Sets: 57/1/2, 57/2/1]
Class 12 · Biology · CBSE Board · 2020
Class 12 Biology 2020 Board Exam
152 questions from the 2020 Class 12 exam, combined from all 6 question paper sets (Set 1–6) with duplicates removed.
152questions
6exam sets
13chapters covered
1 / 2 / 3 / 5mark values
Note: The 2020 board exams were held in early 2020, just before the nationwide COVID-19 lockdown.
Questions from the 2020 exam first 10 of 152 — free
- Name the type of cross that would help to find the genotype of a pea plant bearing violet flowers.
[Max Marks: 1 | Set: 57/1/1]
- Meselson and Stahl carried out centrifugation in CsCl2 density gradient to separate :
[Max Marks: 1 | Set: 57/1/1]
- How do cytokine barriers provide innate immunity in humans ?
[Max Marks: 1 | Set: 57/1/3]
- ' 'Cry' protein' coded by gene Cry IAb controls
[Max Marks: 1 | Set: 57/1/2]
- Mention the chemical change that proinsulin undergoes, to be able to act as mature insulin.
[Max Marks: 1 | Set: 57/2/1]
- Which one of the following is not the product of transgenic experiments ?
[Max Marks: 1 | Set: 57/2/3]
- Meselson and Stahl carried out centrifugation in CsCl2 density gradient to separate :
[Max Marks: 1 | Set: 57/1/2]
- Micropropagation can be achieved by
[Max Marks: 1 | Set: 57/1/3]
- State two postulates of Oparin and Haldane with reference to origin of life.
[Max Marks: 1 | Set: 57/1/1]
Chapters covered in the 2020 exam
Sexual Reproduction in Flowering Plants
23 questions in 2020
Human Reproduction
17 questions in 2020
Reproductive Health
3 questions in 2020
Principles of Inheritance and Variation
13 questions in 2020
Molecular Basis of Inheritance
19 questions in 2020
Evolution
15 questions in 2020
Human Health and Diseases
18 questions in 2020
Microbes in Human Welfare
7 questions in 2020
Biotechnology – Principles and Processes
8 questions in 2020
Biotechnology and its Applications
9 questions in 2020
Organisms and Populations
8 questions in 2020
Ecosystem
9 questions in 2020
Biodiversity and its Conservation
4 questions in 2020
About the 2020 Class 12 Biology paper
CBSE conducted the 2020 Class 12 Biology board exam in 6 question paper sets — students in different regions received different sets of the same exam. This page combines every set and removes repeated questions, giving you all 152 unique questions actually asked that year. The 2020 questions drew from 13 chapters of the syllabus.