InterviewSolution
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InterviewSolution
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(a) Name a terminal method to prevent pregnancy in humans.(b) Describe the procedure of the terminal method carried in human male and female. |
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Answer» (a) Surgical methods / Sterilisation = 1 (b) Males - Vasectomy , a small part of vas deferens is removed or tied up through a small incision on the scrotum = ½ + ½ Females - Tubectomy , a small part of the fallopian tube is removed or tied up through a small incision in abdomen or through vagina = ½ + ½ OR (a) Do all pollen grains remain viable for the same length of time ? Support your answer with two suitable examples. (b) How are pollen grains stored in pollen banks ? State the purpose of storing pollen grains in these banks. Ans. (a) No = 1 Examples : (i) Cereals / rice / wheat - pollen grains / loose viability with in thirty minutes of their release = ½ (ii) In some members of Rosaceae / leguminoseae / Solanacease maintain viability for months = ½ (b) Using cryopreservation techniques / in liquid nitrogen (-196° C) = ½ Maintaining viability / preserving threatened species / preserving commercially important plants / to be used for crop breeding programmes = ½ |
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