Unit 3: Nutrition in Amoeba
Check you progress (Pg 20)
1. Phagocytosis
2. protozoa and algae
3. The nucleus, food vacuole,and contractile vacuole 4. Locomotion and engulfing of food particles
Unit 4: Nutrition in Ruminants
Flow chart to trace the path the food travels in the
digestive system of a ruminant
Check you progress (Pg 21)
1. cattle, sheep, goats
2. omasum, abomasums, rumen, reticulum 3. abomasum
4. The partially digested food in the rumen that is brought back again into the mouth for
chewing
Unit 5: Role of the Mouth, and Teeth in the Human Digestive system
1. Root
2. Crown
3. Incisors: help to bite and cut food into small chewable pieces.
Canines: help in tearing the food
Premolars: help crush, grind food and move it from the front teeth to the molars for chewing
Molars: They chew food into small, easily consumable pieces.
Unit 6: Role of Tongue and salivary glands in the Human Digestive
system Check you progress (Pg 25)
1. Amylase
2. Mechanical/physical digestion and chemical digestion
3. Incisors, canines, premolars and molars
4. 32
Unit 7 : Role of other organs of the Human Digestive System
Check you progress (Pg 29)
1. Duodenum, jejunum, and ileum
2. It prevents the food from entering the wind pipe
3. To increase the surface area for absorption of nutrients 4. Pepsin
Unit 9 : Lets Exercise
Lets Exercise (Answers)
1. a. Pepsin
b. crown
c. Rumen
d. contractile vacuole
2. a. Pseudopodia
b. Hydrochloric acid
c. Pulp
d. Peristalsis
3. a. False
b. True
c. True
d. False
4. a. ii
b. i
c. iv
d. iii
5. a. Which enzyme present in saliva acts on starch?
Amylase
b. Where is bile stored?
Gall bladder
c. Which glands present in the mouth help in the breakdown of food?
Salivary glands
d. Which group of animals have a four-chambered stomach? Ruminants
e. Which finger-like projections are found on the inner lining of the small intestine?
Villi
6. a. What is Phagocytosis?
The process of engulfing a food particle and breaking it down inside a cell is known as phagocytosis.
b. What is holozoic nutrition?
In holozoic nutrition an animal consumes solid or liquid food which is broken down or digested by the body into simpler substances. Useful substances are absorbed by the body while the undigested and harmful substances are thrown out.
c. What are the different chambers of a ruminant’s stomach?
There are four chambers of a ruminant’s stomach – 1) Rumen
2) Reticulum 3)Omasum 4)Abomasum
d. Name the glands which help in the digestion of food in the small intestine of humans.
Liver and Pancreas
7. a. Hydrochloric acid does not corrode the lining of the stomach. The mucous lining of the stomach protects it from the corrosive effects of the acids.
b. It is advisable to brush our teeth twice a day.
Bacteria are naturally present in our mouth. They act on the food particles present in the gaps between our teeth and form a sticky yellowish layer
on the teeth known as plaque.
The sugar and starch in the food items are converted to acids by the plaque. These acids corrode the enamel and may cause tooth decay and cavities. In order to prevent the formation of plaque and tooth decay, we must brush our teeth twice a day to remove all residual food particles
8. a. Explain parasitic nutrition with examples.
Refer to pg 17
b. Write a note on the small intestine and its role in digestion of food.
Refer to pg 28
c. Explain the steps in Nutrition.
Refer to pg 19
d. What is the function of the large intestine in the digestion of food in human beings?
Refer to pg 28
9. a. Refer to pg 22
b.
Types of teeth
Molars
to chew
food into small,
easily
consumable
pieces
12
10.
Incisors
help to bite and cut
food into small chewable
pieces.
8
Canines
tearing the food.
4
Premolars
to crush and grind and
food and
move it to the molars for
chewing.
8
11. Anushka is correct. It is important to chew our food as digestion takes place in the
mouth and chewing the food ensures that the starch present in it is broken down. Knowledge, Awareness and Care
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