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TIRUPATTUR DISTRICT 2021-2022, XII- BIOLOGY — Mid Term Exam-1, Marks : 50 Time : 1.30 Hrs, Part-I (Bio-Botany) Marks: 25, Note: 1. Answer all the questions 5x1=5, 2. Choose the most suitable answer from the given four alternatives and write, the option code and the corresponding answer, 1. The embryo is small and consists of one shield shaped cotyledon know as., , , , a) Plumule b) Scutellum ©) Micropyle d) Epithelium., 2. choose the in correct pair:, , a) Entomophily - Salvia b) Anemophiliy - Maize, , ©) omnithophily - Sterlitzia. d) Myrmecophily - Adansonia, , 3. According to dihybrid test cross pick out the correct pair., a) RrYy.- 50% — b) Yy_75% c) Rryy. - 35% — d) mryy._ 25%, , 4, Find the wrong pair a) Trisomy -(2n+1) __b) Tetrasomy - (2n+2), ©) Pentasomy - (2n+3) _d) Double Tetrasomy (2n+1+1), , 5. At what stage does crossing over occur?., a) Leptotene b) Pachytene ©) Diplotene d) Zygotene, , IL Answer any three_ of the following questions 3x2=6, 6. What is pollinium ?, , 7. What is endothelium?, , 8. Define alleles, , 9. What is genetic map ?, , 10. What is Plerotrophy ?, , IIL Answer any three of the following questions.Question 14" is compulsory. 3x3=9, 11. List out the importance of pollination., , 12. Write the short notes on incomplete dominance, , 13. Explain monohybrid cross, , 14. Write any three significance of ploidy, , 15. What is crossing over ? Write any two significance ., , IV. Answer the following question. 1x5=5, 12. Explain the structure of T.S. of mature anther., 13. Explain epistasis in summer squash