CBSE Class 12 Biology Sure Short Questions Set (3). CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
SUBJECT – BIOLOGY
Qus. 1 The cell division involved in gamete formation is not of the same type in different organisms. Justify.
Ans.The parents may be haploid or diploid but the gametes always have to be haploid. Diploid parents undergo meiosis to produce haploid gametes. Whereas haploid parents undergo mitosis to produce haploid gametes.
Qus. 2 Mention the unique flowering phenomenon exhibited by Strobilanthus kunthiana (neelakuranaji).
Why is Eichhorniacrassipes nicknamed as ―Terror of Bengal‖?
Ans.Strobilanthus kunthiana flowers once in 12 years.
Eichhornia crassipes is an aquatic weed that grows abundantly and very fast in eutrophic water bodies and imbalances water ecosystem. It causes oxygen depletion leading to death of aquatic life (eutrophication).
Qus. 3 Name the units of vegetative propagation in water hyacinth. Explain giving reasons why it has become the most invasive aquatic weed.
Ans.Offset. Since the formation of hyacinth offsets does not involve two parents, the process involved is asexual, therefore they spread quickly.
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