13. (a) What does the peripheral nervous system consist of?
(b) Why reflex arcs are evolved in animals?
(c) The damage to the medulla causes instantaneous death? Why?
14.(a) State any two functions of cerebellum?
(b)Reflex arcs are formed in the spinal cord? Why?
(c)Cells cannot continually create and transmit electrical impulses and why?
15. The heart of amphibians and reptiles are three chambered, give reason? Also
state one point of difference between arteries and veins?
16.(a)The small intestine of herbivores is longer why?
(b) What is the role of mucous secreted in stomach?
(c)What are villi?
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13 (a) The PNS consists of the nerves and ganglia outside the brain and spinal cord.
(b) In animal the brain is not well developed so the thinking process is not fast enough to respond any stimuli. therefore the reflex arc are evolved for instant reaction.
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