CBSE Class 12 Biology Revision Worksheet Set B

CBSE Class 12 Biology all chapters revision worksheets (1). 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.

1. Name the asexual reproductive structure in
a) Penicillium
b) Sponge
2. In diploid organisms, the gamete mother cells are called ____________ 
3. Coconut water in tender coconut is actually ___________________ (endosperm / early cotyledon / fruit)
4. What are vegetative propagules? Name any one.
5. Mention the function of filiform apparatus. 
6. Cleistogamous flowers produce assured seed set even in absence of pollinators. How? 
7. Write difference between menstrual cycle and Oestrus cycle. 
8. Match the following:
a) Homothallic 
i) Dioecious
b) Heterothallic
ii) Monoecious
9. In Chara, the female sex organ is _______________ and the male sex organ is ____________ . 
10. a) Why are off-springs of oviparous animals at greater risk than off-springs of viviparous animals?
b) What is common between Turkey (bird) and honey bee which is unusual in sexually reproducing animals.
11. a) Pollen grains are tolerant to strong acids and high temperatures. What made it so?
b) Which area in the coat of the pollen grain this tolerance is absent?
12. How is Geitonogamy different from autogamy and Xenogamy? 
13. Discuss on the devices which plants have developed to encourage cross pollination. (any two) 
14. Draw the structure of an anatropous ovule and label 6 parts. 
15. a) Enlist the characteristics of flower favouring wind pollination.
b) Name two plants pollinated by wind.
16. Write the steps you would follow to artificially hybridize your crop plants. 
17. What happens to the following after fertilization:
Egg, Polar nuclei, Antipodal cells, Synergids, ovule, ovary 
18. a) Explain the development of microspores in angiosperms.
b) Are microspores the male gametes? Justify?
19. Explain the following terms:
a) Polyembryony
b) Scutellum
c) Perisperm
d) Apomixis
e) Triple fusion

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