Activity Based Q/A
1. The function of KOH taken in the test tube is to absorb:
(a) released water vapours
(b) released Carbon di oxide
(c) released oxygen
(d) chlorophyll
2. The event that does not occur in photosynthesis:
(a) absorption of light energy by chlorophyll
(b) reduction of carbon dioxide to carbohydrates
(c) oxidation of carbon to carbon dioxide
(d) conversion of light energy to chemical energy
3. Iodine solution gives blue black colour with
(a) starch
(b) proteins
(c) glucose
(d) fats
4. Which substance breaks down starch?
(a) Lipase
(b) Amylase
(c) Complex sugar
(d) Trypsin
5. Which of the following would be found in greater amounts that usual in the undigested waste as a consequence of removal of part of the smell intestine where much of the absorption takes place?
(a) Protein fragments
(b) Complex sugars
(c) Starch
(d) Amino acids
6. Name the parts of the human digestive system where digest of food does not take place.
Ans: In the human alimentary canal, the parts where digestion of food does not take place is the oesophagus, the large intestine and anus.
7. Compare the function of the small intestine and the function of the large intestine.
Ans: In the small intestine, the complete digestion of food takes place followed by the absorption of nutrients. How, in the large intestine, salts, vitamins and water are absorbed from the undigested food and is stored till it is not removed through the anus.
8. What is the composition of of gastric juice?
Ans: The gastric juice secreted by gastric glands of the stomach includes HCl, Pepsin and Mucus.
9. What is the function of the enzymes Pepsin and Trypsin:
Ans: Both are a protein digestive enzymes. Both are responsible for the breakdown of proteins.
But Pepsin works in acidic medium and released by gastric wall of stomach whereas Trypsin works in alkaline medium and released by pancreas.
10. What would happen, if HCl is not secreted?
Ans: If HCl is not secreted by gastric glands, then pepsin will not be activated. This will inhibit the process of digestion of proteins in the stomach.
12. Hydrochloric acid is very acidic(pH less then 2), but does not erode the inner lining of the stomach wall. Why?
Ans: Hydrochloric acid is very acidic, but does not erode that inner lining of the stomach wall because the mucus protects the inner lining of the stomach from the action of acid under normal conditions.
13. Some organisms derive nutrition from plants or animals without killing them. What are these organism called? Give one example.
Ans: Parasites derive nutrition from host body without killing them. e.g., Plants like Cuscuta (amarbel) and animals like Plasmodium, Ascaris, Leeches etc.
14. Name the enzyme, which initiates the protein digestion in infants?
Ans: Rennin, which initiates the protein digestion in stomach in infants.
15. What is the primary requirement for pancreatic enzymes to act?
Ans: The Presence of alkaline medium in the small intestine. This is added by bile juice which is alkaline in nature.
MCQs Answers: ANSWERS
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