CBSE Class 12 Biology Question Paper 2022 Set 01 Solved

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Access comprehensive previous year question papers for Class 12 Biology using the CBSE Class 12 Biology Question Paper 2022 Set 01 Solved. Designed to align with the 2026-27 CBSE academic guidelines, these solved papers help students assess their exam readiness and understand official marking schemes.

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SECTION A
 
1. Identify the two correct statements from the following
(i) Apiculture means apical meristem culture.
(ii) Spinach is iron –enriched.
(iii) Green revolution has resulted in improved pulse-yields
(iv) Aphids cannot infest rapeseed mustard.
 
2. Mention the role of Restriction Enzymes in Recombinant DNA technology. 
 
3. After a brief medical examination a healthy couple came to know that both of them are unable to produce functional gametes and should look for an „ART‟ (Assisted Reproductive Technique). Name the „ART‟ that you can suggest to them to help them bear a child.
 
4. What is Biopiracy? 
 
5. How many kinds of phenotypes would you expect in F2 generation in a monohybrid cross exhibiting co-dominance?
 
SECTION B
 
6. Explain the events that occur during fertilization of an ovum in humans. How is it that only one sperm enters the ovum?
 
7. Why is the possibility of human female suffering from hemophilia rare? Explain. 
 
8. What is the pathogenic property of baculovirus, used as biological agents? Name the genus of these organisms.
 
OR
 
Mycorrhizal association exists between fungi (Glomus sp) and roots of higher plants. How is this association beneficial to each member?
 
9. a) Why is small amount of curd added to milk?
b) What is the difference between fermentation of dough for making dosa and bread?
 
10 “Niche is a part of a habitat.” Explain with the help of an example. 
 
SECTION C
 
11. (a) Draw a diagram of Pistil showing pollen tube growth in angiosperm and label (i) Stigma; (ii) male gametes; (iii) micropyle and (iv) Ovule.
(b) Write the function of micropyle.
 
12. Differentiate between
(a) Xenogeny and Geitonogamy
(b) Oviparous and Viviparous organisms
(c) Pathogenesis and Parthenocarpy
 
13. According to the Darwinian theory, the rate of appearance of new forms is linked to their life cycles. Explain.
 
14. “DNA replication is semi-conservative”. Name the scientists who proposed it and who proved it. How was it proved experimentally? Explain.
 
15. “A population has been exhibiting genetic equilibrium”. 
Answer the following with regard to the above statement.
(i) Explain the above statement.
(ii) Name the underlying principle.
(iii) List any two factors which would upset the genetic equilibrium of the population.
(iv) Take up any one such factor and explain how the gene pool will change due to that factor
 
16. (a) Name the causative organisms for the following diseases:
(i) Elephantiasis (ii) Ringworm (iii) Amoebiasis
(b) How can public hygiene help control such diseases?
 
17. Microbes play a dual role when used for sewage treatment as they not only help to retrieve usable water but also generate fuel. Write in points how this happens?
 
18. What was the challenge for production of insulin using rDNA techniques? How did Eli Lilly produce insulin using rDNA technology?
 
19. (a) What is an “allergic reaction”?
(b) Name any two drugs used to quickly reduce the symptoms of allergy.
(c) Why do more and more children in metro cities of India suffer from allergies and asthma?
 
20. What are „cloning sites‟ in a cloning vector? Explain their role. Name any two such sites in pBR322.
 
OR
 
Name the host plant and that Meloidogyne incognitia infects. Explain the role of Agrobacterium in the production of ds-RNA in the host plant.
 
21. Why do lepidopterans die when they feed on Bt cotton plant? Explain how it happens. 3
 
22. Explain with the help of two examples how certain plants have evolved morphological and chemical defenses against primary consumers such as cows and goats.
 
SECTION D
 
23. A son persuades his father to replace his old mobile phone with the latest model launched in the market. He also shares the latest features it has and explains how it can be of a help to him in the modern technological world. Father is reluctant in buying a new one and tries to explain about its environmental impact. How do you think, the biologist father would try to convince his son? Justify the arguments of father and son both, by mentioning positive aspects of the behavior displayed by both of them in the situation concerned (three each).
 
SECTION E
 
24. (a) What are the benefits of choosing a dioecious plant species for plant breeding experiments?
(b) How would you proceed to cross-pollinate a monoecious flower?
(c) Draw a labelled schematic diagram of T.S. of an anther of an angiosperm.
 
OR
 
(a) Explain the hormonal regulation of spermatogenesis in humans.
(b) Draw the diagram of a human sperm. Label and write the functions of the components of its head.
 
25. State and explain the “law of independent assortment” in a typical Mendelian dihybrid cross.
 
OR
 
(a) How are the observations made during moth collection in pre- and post-industrialized era in England support evolution by Natural Selection?
(b) Explain the phenomenon that is well represented by Darwin‟s finches other than natural selection.
 
26. (a) Draw a simplified model of phosphorus cycling in a terrestrial ecosystem.
(b)Write the importance of such cycles in ecosystems.
 
OR
 
(a) Explain the narrowly utilitarian, broadly utilitarian and ethical arguments in favor of conservation of biodiversity.
(b) How is designation of certain areas as hotspots a step towards biodiversity conservation? Name any two hotspots in India.


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Where can I download the official PDF for CBSE Class 12 Biology Question Paper 2022 Set 01 Solved?

The CBSE Class 12 Biology Question Paper 2022 Set 01 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 Question Paper 2022 Set 01 Solved based on the official CBSE marking scheme?

Yes, the solutions for CBSE Class 12 Biology Question Paper 2022 Set 01 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 Question Paper 2022 Set 01 Solved help in preparing for the 2026 exams?

Solving previous year papers like CBSE Class 12 Biology Question Paper 2022 Set 01 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 Question Paper 2022 Set 01 Solved in different languages?

Yes, where applicable, CBSE Class 12 Biology Question Paper 2022 Set 01 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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