Question No -10,11,12,13
Answers
Answer:
this questions are from which subject
Explanation:
10). Veins are thin walled because the blood flows in low pressure in the veins.So, the pressure of blood against walls of veins is less. so veins do not require thick walls.
Veins have valves to prevent the backflow of the blood since the blood will be under low pressure, chances are there it to flow backward. So, to prevent this backflow of blood, valves are present in veins
11) Small intestine has finger like projections called villi in its inner wall. these villi ensures larger surface area for absorption of digested food.
or
11) Goat will have longer small intestine. Goat is a herbivore, and hence feeds on grass which is rich in cellulose. cellulose is very difficult to digest and takes longer time for digestion. But tiger is a carnivore which feeds on flesh which will not take longer time for digestion. So goats have longer small intestine
12) ozone protects earth from harmful ultra violet radiations coming from the sun. these UV rays may cause skin cancer, cataract etc, from which ozone layer protects us.
or
12) as 10% of energy is only transferred to every successive level, the energy transferring is very low. if there is more than four trophic levels, then there not even be 10% of energy will be transferred to fifth trophic level., due to which only four trophic levels are possible.
13) pancreas releases trypsin, amylase, and lipase into small intestine. trypsin digests proteins, amylase digests carbohydrates and lipase emulsifies the fat globules.
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