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BIOLOGY [3 marks Question Answer]

Digestive System · ICSE STD 6 (ICSE - English Medium). 8 questions.

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[3 marks Question Answer]

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Question 13 Marks
Given alongside is the diagram of the human alimentary canal.
(i) Name the parts 1-11 indicated by guidelines.
1.____ 2.____ 3.____ 4.____ 5.____ 6.____ 7.____ 8.____ 9.____ 10.___ 11.____
(ii) State the function of the juice secreted by the part 1.
(iii) State the function of the three enzymes found in the juice secreted by part 3.

Answer
(i)
1—Stomach
2—Bile duct
3 — Pancreas
4 — Large intestine
5 — Small intestine
6 — Rectum
7—Appendix
8 — Pancreatic duct
9— Gall Bladder
10—Liver
11—Anus
(ii) The gastric juice being acidic kills the germs and activates pepsin.
(iii)
1. amylase — digests starch
2. trypsin — digests protein
3. lipase — digests fat
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Question 23 Marks
Name the types of teeth seen in humans.
Answer
Human teeth are of four kinds:
  1. Incisors are the four front teeth at the middle of each jaw. They are chisel-shaped for biting and cutting.
  2. Canines are one on either side of the incisors in each jaw. They are pointed for tearing the food.
  3. Premolars are two on each side of canines in each jaw. They help in crushing and grinding the food.
  4. Molars are the last three teeth on each side in each jaw. They have a broad uneven surface for finer crushing and grinding of ingested food.
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Question 33 Marks
Name the digestive juice secreted by the stomach and give its function.
Answer
The digestive juice secreted by the stomach is the gastric juice.
The gastric juice contains
  1. — water
  2. — hydrochloric acid
  3. — enzyme
Which have the following roles:
  1. Hydrochloric acid serves to kill the germs and activates pepsin. Pepsin converts proteins into peptones and proteoses.
  2. Enzyme rennin converts the milk casein into curd.
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Question 43 Marks
What is the role of the liver and the pancreas respectively in the digestion of food?
Answer
  1. Liver: It produces a green-yellow fluid called the bile which emulsifies fats making it easy to be digested. The bile also contains sodium bicarbonate which neutralises the acid of food coming from the stomach and makes it alkaline.
  2. Pancreas: It produces the digestive juice called the pancreatic juice which acts on carbohydrates, proteins, and fats and convert them into simpler units called glucose, amino acids and fatty acids respectively
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Question 53 Marks
Food are classified into three groups on the basis of the function they perform in our body. Name the three categories, and briefly give their functions. Also give their two sources each.
Answer
Function
1. energy giving food
2. bodybuilding food
3. regulatory and protective foods
Nutrient
1. carbohydrates and fats
2. proteins
3. vitamins and minerals.
Food
1. cereals, fats, sugar
2. pulses, milk, meat chicken
3. fruits and vegetables
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Question 63 Marks
Define the term nutrition.
Answer
The process by which living beings receive food and utilise it to grow and become healthy is called nutrition.
On the basis of nutrition, living beings can be classified into the following types:
  1. Holozoites
  2. Parasites
  3. Saprophytes
  4. Symbionts
Holozoits can be further classified into
  1. herbivores
  2. carnivores
  3. ommivores
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Question 73 Marks
Differentiate between.
Mechanical digestion and Chemical digestion
Answer
Mechanical digestion:
1. In mechanical digestion, the ingested food is broken down in the mouth by chewing it.
2. Teeth help in mechanical digestion
3. Food is not completely digested in it.
Chemical digestion:
1. In chemical digestion, the food is digested by the action of enzymes.
2. Enzymes are involved in chemical digestion.
3. Proper digestion of food occurs in it.
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Question 83 Marks
Differentiate between
Digestion and Absorption
Answer
Digestion:
1. It is the process of converting complex food into a simple absorbable form.
2. It is a series of mechanical and chemical reactions.
3. Many enzymes are associated with digestion.
Absorption :
1. It is the process of passing digested food through thin walls of blood capillaries and enters the bloodstream.
2. No mechanical or chemical reaction occurs in absorption. 3. No enzyme is associated with absorption.
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[3 marks Question Answer] - BIOLOGY STD 6 Questions - Vidyadip