Selina solutions concise biology class 6 icse Solutions for Chapter 4 digestive system

Q1) Define the term Nutrition.

Q2) What is the role ofthe liver and the pancreas respectively in the digestion of food ?

Q3) Name the digestive juice secreted by the stomach and give its function.

Q4) Anwer the following questions :

(i) Name the types of teeth seen in humans.

(ii) How is the small intestine best suited for the digestion and absorption of food ?

(iii) What do you mean by absorption of food ?

Q5) Define the terms :

Egestion, digestion, assimilation

Q6) Rewrite the following parts of the human alimentary canal in theur correct sequence.

Stomach, oesophagus , Large intestine, Small intestine, Pharynx

Q7) What is the fate of excess glucose in our body ?

Q8) Define the term ‘ digestion’ .

Q9) State the four ways in which saliva is useful to us.

Q10) 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.

Q1) Put a tick against the most appropriate alternative in the following statements.

(a) The teeth which help in tearing the food are the:

1. Incisors

2. Canines

3. Premolars

4. Molars

(b)Last molar tooth in human beings is called:

1. Adult tooth

2. Wisdom tooth

3. Child tooth

4. Elders tooth

(c) The hardest substance in your body

1. Dentine

2. Bone

3. Cement

4. Enamel

(d) Saliva converts starch into:

1. Glucose

2. Sucrose

3. Maltose

4. Lactose

(e) Protiens of the milk are converted into curd by the enzyme:

1. Trypsin

2. Rennin

3. Pepsin

4. Steapsin

Ans:(b)

(f) Bile juice is produced by

1. Stomach

2. Liver

3. Pancreas

4. Gall bladder

Q1)Write True or False in the following statements:

1. Molars help in cutting and tearing food.

2. Crabohydrates are digested into glucose.

3. Protiens are digested into fatty acids

Q2) Fill in the blanks :

1. The teeth called are a total of__________ in number on the sides of incisors.

2. The teeth called __________ are a total of four in number on the sides of incisors.

3. __________ is a common opening of food pipe and wind pipe.

4. Molars are meant for __________ the food.

5. Incisors are used for__________ and __________ the food.

6. The __________ are used for tearing the food.

7. The __________ and__________ are used for crushing and grinding the food.

8. In an adult human,there are a total of______ teeth.

9. The human teeth appear in two sets,the first set is called primary which consists of only __________ teeth.

Q3) Name the following:

1. End product of starch after digestion.

2. The organ where protein digestion begins.

3. The organ into which the pancreatic juice and the bile juice are poured.

4. The enzyme which digests fat.

5. The simplest form of carbohydrates.

6. The part of the alimentary canal where water from undigested food is absorbed .

7. The end-product of proteins after digestion.

Q4) Identify and name the four type of teeth shown below and give their functions.

Q5) State whether the following statements are True or False.

(i) Wisdom teeth appear at the age of 5-6 years when the child starts going to school.

(ii) The temporary set of teeth includes incisors,canines and premolars only.

(iii) The ducts from the salivary glands open into the duodenum.

(iv) Saliva changes starch into maltose.

Q6) Fill in the blanks in the table (1-5) by selecting the suitable names from the list given below :

(steapsin, peptones , fatty acids , proteoses , proteins)

Q7)

(i) Name the juice secreted by the liver.

(ii) Name the organ where this juice is temporarily stored.

(iii) What is the main function of this juice ?

Q8) Name the three enzymes found in pancreatic juice.

(i)_________

(ii)_________

(iii)_________

Q9) Name the three regions of the large intestine .

Q10) 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 fuction of the juice secreted by the part 1.

(iii) State the function of the three enzymes found in the juice secreted by part 3.