Short Answer Type(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 ?
Describe the inter-relationship between productivity, gross primary productivity and net productivity.
Long Answer TypeIt 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 ?
Parents feel embarrassed as : -
(a) Indian Society is not that broad minded and parents feel shy talking openly regarding these matters to their children due to which their children go astray sometimes. But parents should consider that at adolescence parents should behave like friends to their child. So that child could also share his problems with parents. Parents should give right information about the reproductive aspects, sexual practices, adolescence changes to their children so that their children will never be misleaded.
(b) By an example of male honey bee and orchid ophyrys flower, it is evident that sexual attraction is a natural phenomenon, the honey bee is attracted to a ophrys flower and assumes its one petal as its female partner & pseudo copulates with it. So it is a natural phenomenon & parents should talk regarding this matter to their children.
(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.
(a) Compare, giving reasons, the J-shaped and S-shaped models of population growth of a species.
(b) Explain ‘fitness of a species’’ as mentioned by Darwin.
Write the different components of a lac-operon in E. coli. Explain its expression while in an ’open’ state.
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