CBSE Class 12 Biology Compartment Question Paper 2020 Set 02 Solved

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Class 12 Biology Solved Question Papers: CBSE Class 12 Biology Compartment Question Paper 2020 Set 02 Solved

Review targeted exam resources with the CBSE Class 12 Biology Compartment Question Paper 2020 Set 02 Solved. Built according to official CBSE standards for the 2026-27 academic year, these downloadable Class 12 Biology question papers support effective revision and performance tracking.

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SECTION A
1. The role of FSH in the process of spermatogenesis in humans is to
 
(A) stimulate the secretion of certain factors from Sertoli cells.
 
(B) inhibit the secretion of testosterone from the interstitial cells.
 
(C) stimulate the action of testosterone on Sertoli cells.
 
(D) stimulate the secretion of LH from pituitary cells.
 
2. Some cyanobacteria in aquatic and terrestrial environment that enrich the soil by fixing atmospheric nitrogen are 
 
(A) Rhizobium and Azotobacter
 
(B) Azospirillum and Glomus
 
(C) Anabaena and Nostoc
 
(D) Azospirillum and Azotobacter
OR
Colostrum provides passive immunity to human infants as it contains antibody
 
(A) IgA
 
(B) IgM
 
(C) IgE
 
(D) IgG
 
3. The specific site for fertilisation in human female is 
 
(A) Infundibulum
 
(B) Uterus
 
(C) Ampulla
 
(D) Ampullary isthmic junction
OR
The hormone that regulates the synthesis and secretion of androgens in human males is 
 
(A) GH
 
(B) FSH
 
(C) LH
 
(D) Prolactin
 
4. In biotechnology experiments, ‘molecular scissors’ used are 
 
(A) Plasmid
 
(B) Restriction enzymes
 
(C) Vectors
 
(D) Sigma factor
 
5. ‘Cry genes’ that code for insecticidal toxins are present in 
 
(A) Cotton bollworms
 
(B) Nematodes
 
(C) Corn borer
 
(D) Bacillus thuringiensis
 
SECTION B
 
6. Why do some organisms enter into diapause while some others into aestivation ? Give one example each of such organisms. 
 
7. Mendel did not explain the expression of incomplete dominance in plants.
 
Give an example of flower exhibiting incomplete dominance.
 
Name and state the Law of Mendel the genes which exhibit incomplete dominance follow. 
OR
Your teacher gave you a tall pea plant and asked you to find whether the plant is homozygous tall or heterozygous tall. How will you proceed to find the genotype of the given plant ? 
 
8. Draw a schematic diagram of a transcription unit with the polarity of the DNA strands and label coding strand, template strand and terminator. 
 
9. Causative organisms of some diseases gain entry into human body through mosquito bites and make humans suffer from the disease.
 
Name one such :
(i) protozoan disease along with the scientific name of the causative organism.
 
(ii) helminthes disease along with the scientific name of the causative organism. 
 
10. What is ‘bagging’ ? State its importance in artificial hybridization of flowering plants.
 
11. (a) Mention the difference in the level of BOD before and after the secondary treatment of sewage water.
 
(b) Write the importance of ‘flocs’ during the secondary treatment of sewage. 
 
12. Name any two cereal crops that have been fortified. Mention how.
 
Please click on below link to download CBSE Class 12 Biology Compartment Question Paper Solved 2020 Set B.

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CBSE Class 12 Biology Compartment Question Paper 2020 Set 02 Solved & Previous Year Question Papers for Class 12 Biology

Previous Year Question Papers: Class 12 Biology

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Where can I download the official PDF for CBSE Class 12 Biology Compartment Question Paper 2020 Set 02 Solved?

The CBSE Class 12 Biology Compartment Question Paper 2020 Set 02 Solved is available for download on StudiesToday.com. It includes complete set with all sections so that Class 12 students can practice with the exact same paper that came in the CBSE exams.

Are the solutions for CBSE Class 12 Biology Compartment Question Paper 2020 Set 02 Solved based on the official CBSE marking scheme?

Yes, the solutions for CBSE Class 12 Biology Compartment Question Paper 2020 Set 02 Solved are prepared by subject matter experts as per official marking scheme. Class 12 students will understand the structure of answers and 'step-marks' methodology Biology.

How does solving CBSE Class 12 Biology Compartment Question Paper 2020 Set 02 Solved help in preparing for the 2026 exams?

Solving previous year papers like CBSE Class 12 Biology Compartment Question Paper 2020 Set 02 Solved is important to understand repeat themes and question difficulty levels of Biology. It helps Class 12 students to test their time management skills too.

Can I access CBSE Class 12 Biology Compartment Question Paper 2020 Set 02 Solved in different languages?

Yes, where applicable, CBSE Class 12 Biology Compartment Question Paper 2020 Set 02 Solved is available in both English and Hindi mediums. All students from Class 12 can access Biology study material in their preferred language.

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