During which phase of meiosis are chiasmata formed a prophase I b metaphase II

During which phase of meiosis are chiasmata formed a

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During which phase of meiosis are chiasmata formed? (a) prophase I (b) metaphase II (c) metaphase I (d) telophase II (e) None of these (xvii)Who proposed the mutation theory of Evolution? (xviii)During which stage of meiosis do homologous chromosomes separate? (xix)In a DNA molecule, the bases of pyrimidine are: Triassic and Jurassic periods are included in the: (a) Palaeozoic era (b) Mesozoic era (c) Coenozoic era (d) Proterozoic era (e) None of these PART – IINOTE: (i)PART-II is to be attempted on the separate Answer Book. (ii)Attempt ONLY FOURquestions from PART-II. All questions carry EQUALmarks.(iii)Extra attempt of any question or any part of the attempted question will not be considered.Q.2.(a) Give an account of the mechanisms by which the living cell is believed to synthesize proteins. (12) (b) Explain how carbon dioxide is transported by the blood? (8) Q.3.(a) Describe the structure and functions of cell membrane. (12) (b) How is the nerve impulse generated and conducted. (8) Q.4. (a) Describe prophase-I of meiosis in detail with the help of labeled diagrams. (10) (b) Give an account of digestion of food in mammals. (10) Q.5.(a) Describe the structure and functions of Endoplasmic reticulum. (10) (b) What is haemoglobin? How it carries oxygen in the blood? What happens when carbon monoxide combine with haemoglobin? (7) (c) Differentiate between pinocytosis and phagocytosis. (3) Q.6.(a) Give an account of Mendel’s law of segregation with example. (10) (b) What is vestigial organ? Presence of vestigial organs is taken as an evidence of evolution. Discuss. (10) Q.7. (a) What are biogeochemical cycles? Describe the carbon cycle in detail. (10) (b) Given an account of Lamarck’s theory of evolution. (10)Q.8. Write short notes on: (5+5+5+5) (i) Natural Selection (ii) Mutation (iii) Hormones (iv) Chromosomal aberration ********************
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