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BIOLOGY [3 marks Question Answer]

Digestive System · ICSE STD 9 (ICSE - English Medium). 3 questions.

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[3 marks Question Answer]

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Question 13 Marks
Observe the diagram given alongside and answer the following:
  1. Name the parts numbered 1-8.
  2. Which parts shown in the diagram are non-living?
  3. Is the tooth suited for cutting, tearing or grinding?
  4. What is the function of parts 8 and 7?
  5. What is the total number of teeth present in adult human beings?
  6. Write the dental formula of human beings.
Answer
  1. 1. Enamel; 2. Dentine; 3. Blood capillaries; 4. Cement; 5. Blood vessels; 6. Periodontal membrane; 7. crown and 8. root.
  2. Enamel, dentine and cement
  3. Yes
  4. The function of the root is to hold the teeth in the jaw and the function of the crown is it completely encircles and protects the teeth.
  5. 32
  6. The dental formula of humans is 12/2, C 1/1, P 2/2, M 3/3 (16x2= 32).
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Question 23 Marks
Name different steps involved in animal nutrition. Explain.
Answer
The steps involved in animal nutrition are:
  1. Ingestion - It means taking solid or liquid food inside the body.
  2. Digestion - It is the breaking down of complex insoluble food components into simple soluble substances.
  3. Absorption - It is the process by which soluble soluble digested food passes from alimentary canal into blood and lymph through intestinal villi.
  4. Assimilation - Utilization of absorbed food by different body cells is called assimilation.
  5. Egestion - Elimination of undigested food as faeces is called egestion.
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Question 33 Marks
Describe the following: Coagulation of milk in the digestive system.
Answer
Rennin is produced by the stomach in an inactive form, called prorennin. After milk is consumed, the gastric acids present in stomach activate the inactive prorennin to active rennin which acts upon casein and converts it into paracasein. Paracasein with the help of calcium ions form Calcium Paracasinate or forms coagulated milk. This coagulated milk turns into peptones in the presence of pepsin.

If milk were not coagulated, it would rapidly flow through the stomach and the digestion of proteins will not take place.

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[3 marks Question Answer] - BIOLOGY STD 9 Questions - Vidyadip