Q5. Give reason:
a)Stomach wall is thick and muscular.
b)Carbon dioxide gas is used in fire extinguishers.
c)Some frogs have sticky pads on the digits.
d)When you put bag just above the candle, it pushes bag upwards.
e)Forest soil is fertile.
Answers
Answer:
a) The stomach is a thick organ so that it does not get dissolved in hydrochloric acid needed for digestion. It is muscular so that it can mix the enzymes needed for digestion with the food properly.
b) Carbon dioxide gas does not support combustion. It displaces oxygen so that oxygen cannot come in contact with fire. Thus, carbon dioxide gas stops the supply of oxygen thereby removing oxygen from the fire triangle. In fire extinguishers, carbon dioxide gas is stored under very high pressure.
c) The frogs in the study, White's tree frogs, have sticky pads on their toes. Scientists learned in 2007 that the angle of the toe pads and a secretion of mucus were involved in the frogs' ability to stick to wet, smooth leaves, rough, dry trees and other surfaces.
d) When a burning candle is placed below the left side paper bag, the air above the candle flame gets heated. The hot air, being lighter, rises up and fills the left side paper bag(by displacing the heavier, cold air from it).
e) Diverse plant materials comprising forest floors are habitats for animals and microorganisms, and facilitate and buffer precipitation inputs.
Hope this helps you.
Answer:
a) there is hydrochloric acid in our stomach so walls are made thick
b)cardon dioxide gas cut the supply of oxygen required to the fire to light up that's why....
c)tree frogs are able to climb smooth surfaces such as broad leaves or smooth rock faces by using extended pads on their digits
e)due to presence of fungi test
rest search on net