Q12 of 805 Page 1

Draw a labelled diagrammatic sectional view of a human seminiferous tubule.



• Spermatogonium: multiply by mitotic division to increase in number.


• Sertoli cells: provide nourishment to developing sperms.


• Primary spermatocyte: undergo meiosis to form secondary spermatocyte.


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10

Plenty of algal bloom is observed in a pond in your locality.

(a) Write what has caused this bloom and how does it affect the quality of water.


(b) Suggest a preventive measure.


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a) List the three stages the annuals and biennial angiosperms have to pass through during their life cycle.

(b) List and describe any two vegetative propagules in flowering plants.


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A number of passengers were severely burnt beyond recognition during a train accident. Name and describe a modern technique that can help hand over the dead to their relatives.

 15

+ 2 pq + = 1. Explain this algebraic equation on the basis of Hardy Weinberg’s principle.