Q8 of 30 Page 1

Mention the role of cyanobacteria as a biofertilizer.

Cyanocteria are a phylum of bacteria that obtain their energy through photosynthesis and are the only photosynthetic prokaryotes able to produce oxygen. Biofertilizers are organisms that enrich the nutrient quality of the soil. Cyanobacteria (Anabaena andNostoc) live freely in the root nodules of leguminous plants and they fix atmospheric nitrogen thereby, acting as a bio-fertilizers especially in paddy fields.


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6

Write the name of the following:

(a) The most common species of bees suitable for apiculture.


(b) An improved breed of chicken.


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Comment on the similarity between the wing of a cockroach and the wing of a bird. What do you infer from the above, with reference to evolution?

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(a) Draw a neat labelled diagram of a nucleosome.

(b) Mention what enables histones to acquire a positive charge.


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State one advantage and one disadvantage of cleistogamy.