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Question Paper 2017-2018

STD: XI BIO-BOTANY Marks : 35 I. Choose the correct answer 8x1=8 1. Structure and reproduction of algae was published by a) F.E Fritsch b) Hooke c) Ainsworth d) Webster 2. The bryophyte moss fossilized to form peat is a) sphagnum b) Laminaria c) riccia d) riclla 3. The process of changing the form in order to carry out a specialized function is called a) differentiation b) growth c) cell division d) cell elongation 4. Pinocytosis is also known as a) cell eating b) cell death c) cell drinking d) cell lysis 5. Compound dichasium is seen in a) jasminum b) nerium c) clerodendron d) deposition 6. Edible part of berry is a) epicarp b) mesocarp c) endocarp d) endocarp 7. The embryo sac in a typical dicot at the time of fertilization is a) 9 celled b) 6 celled c) 7 celled d) 5 celled 8. The root pockets are present instead of root caps in a) Utricularia b) Eichhornia c) Hydrilla d) Limnophylla II. Answer the following question any four 4x2=8 9. Define Nucleocapsid. 10. Distingusih the ribosomes of prokaryotic cell form that of eukaryotic cells. 11. Menion the type of underground stem. 12.Define totipotency. 13. Define splicing. 14. What are trace elements? III. Answer the following question any three Q.No. 18 is compulsory 3x3=9 15. Discuss the role of bacteria in soil fertility. 16. Give reason mitochondria are semi autonomous organelles. 17.Write the differences between epigeal and hypogeal germation 18. Explain the objections to root pressure theory. 19. Describe the method of rainwater harvesting. IV. Answer the following question any two 2x5=10 20. Explain the principle used in scanning electron microscope. (OR) Explain biological nitrogen fixation. 21. List out the important features of the gene concept (OR) Describe the various types of phyllotaxy.

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