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12th Biology 2012 Set1 Outside Delhi Board Paper Solution

Question 14

Give reasons for the following:
(a) The human testes are located outside the abdominal cavity.
(b) Some organisms like honey bees are called parthenogenetic animals.

Answer
(a) Human testis is present outside the human body because it helps in spermatogenesis that requires low temperature i.e. 2-2.5° C (lower than body temperature).
 
(b) In honey-bees, ovum grows and matures into an individual without fertilization. Therefore these animals are called as parthenogenetic animals.