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problem 1:

a) What do you mean by the term adverse external environment?

b) Give two manners in which the plants protect themselves from the adverse external environments.

problem 2:

a) Name the group of substances in plants that control responses to the external stimuli.

b) Illustrate the name which is given to the regions in plants in which these substances are generated? Give positions for two of these regions.

c) Most of the plant shoots are positively phototropic. Describe the positively phototropic term.

d) How does the plant take advantage from this response?

e) Describe the method of response by a plant to a named external stimulus.

problem 3:

a) What do you mean by the term hormone?

b) State any two ways in which the hormones are identical to the group of substances referred to in the above.

c) What do you mean by the term feedback in relation to the hormone action? Give a detail account of the feedback method for a named hormone.

d) describe one deficiency symptom of a named hormone.

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  • Category:- Biology
  • Reference No.:- M99068

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