Read the sentences relatedto the digestive system and choose the word for it transport of digested and soulble food from intestine to blood vessels
Answers
Answer:
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Explanation:
7. Read the following statements with reference to the villi of the small intestine.
(i) They have very thin walls.
(ii) They have a network of thin and small blood vessels close to the surface.
(iii) They have small pores through which food can easily pass.
(iv) They are finger-like projections. Identify those statements which enable the villi to absorb digested food.
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (iii) and (iv)
(d) (i) and (iv)
Soln:
Answer is (a) (i), (ii) and (iv)
Explanation:
Inner walls of the small intestine have thousands of finger-like outgrowths called villi (singular villus). Villi increase the surface area for absorption of the digested food. Each villus has a network of thin and small blood vessels close to its surface. The surface of the villi absorbs the digested food materials. The absorbed substances are transported via the blood vessels to different organs of the body where they are used to build complex substances such as the proteins required by the body.
8. The false feet of Amoeba is used for
(a) movement only.
(b) the capture of food only.
(c) the capture of food and movement.
(d) exchange of gases only.
Soln:
The answer is (c) capture of food and movement.
Explanation:
Amoeba constantly changes its shape and position. It pushes out one, or more finger-like projections, called pseudopodia or false feet for movement and capture of food. Amoeba feeds on some microscopic organisms. When it senses food, it pushes out pseudopodia around the food particle and engulfs it.
9. The enzymes present in the saliva convert
(a) fats into fatty acids and glycerol.
(b) starch into simple sugars.
(c) proteins into amino acids.
(d) complex sugars into simple sugars.
Soln:
The answer is (b) starch into simple sugars.
Explanation:
Saliva consists of salivary amylase enzyme which breaks starch into simple sugar which is further digested by enzymes in the stomach and small intestine.
10. Cud is the name given to the food of ruminants which is
(a) swallowed and undigested.
(b) swallowed and partially digested.
(c) properly chewed and partially digested.
(d) properly chewed and completely digested.
Soln:
The answer is (b) swallowed and partially digested.
Explanation:
Ruminants quickly swallow the grass and store it in a part of the stomach called rumen . Here the food gets partially digested and is called cud. But later the cud returns to the mouth in small lumps and the animal chews it. This process is called rumination.