(a) Define hormone. Write any four characteristics of hormones in humans.
(b) Name the disorder caused by following situations
(i) Under secretion of growth hormone.
(ii) Over secretion of growth hormone.
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(a) Hormones are the chemical substances which co-ordinate and control the activities of living organisms and also their growth. Characterics of hormones are :
(i) They are chemical messengers
(ii) Regulate behaviour of target cells.
(iii) To stimulate the target organs.
(iv) They are proteinaceous or non-proteinaceous in nature.
(b)
(i) Dwarfism
(ii) Tallness
(iii) Diabetes
(iv) Goitre
source : goog.le
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