Q22 of 49 Page 1

Describe the inter-relationship between productivity, gross primary productivity and net productivity.

Productivity is the rate of biomass production per unit area over a period of time by the plants through photosynthesis.


It is expressed as (kcal m-2)yr-1 or g/m2/yr or g m-2 y-1.



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20

Explain the various steps involved in the production of artificial insulin.

 21

A. ‘‘Organisms may be conformers or regulators.’’ Explain this statement and give one example of each.

B. Why are there more conformers than regulators in the animal world?

 23

It is commonly observed that parents feel embarrassed to discuss freely with their adolescent children about sexuality and reproduction. The result of this parental inhibition is that the children go astray sometimes.

A. Explain the reasons that you feel are behind such embarrassment amongst some parents to freely discuss such issues with their growing children.


B. By taking one example of a local plant and animal, how would you help these parents to overcome such inhibitions about reproduction and sexuality?

 24

A. When a seed of an orange is squeezed, many embryos, instead of one are observed. Explain how it is possible.

B. Are these embryos genetically similar or different? Comment.