Match the following: Column A Column B 1. Carbohydrates (i) Fatty acids and glycerol 2. Proteins (ii) Sugar 3. Fats (iii) Amino acids

1- (ii) The carbohydrates get broken into simple sugars such as glucose. The carbohydrates cannot be utilized as such, therefore they are broken down into simpler substances. 2- (iii) The proteins are broken down into simpler substances i.e. amino acids by the action of enzymes in the digestive juices. 3- (i) The partly digested food reaches the small intestine where the intestinal juice completes the digestion of all components of the food. The fats are broken down into fatty acids and glycerol. Column A Column B 1. Carbohydrates (ii) Sugar 2. Proteins (iii) Amino acids 3. Fats (i) Fatty acids and glycerol

Match the words in column A with those in column B. Column A Column B a. Cow p. Long, sticky tongue b. Mosquito q. Long trunk c. Frog r. Chews the cud d. Elephant s. Sharp mouthparts

a-r The cow has flat front teeth that help them to bite and cut their food. Sometimes the cows swallow their food without chewing it. Later, they bring back their food and chew it well. This is called chewing the cud. b-s The mosquito has tube-like mouthparts to attack the skin and suck blood. c-p Frogs have a long, sticky tongue that they bring out to catch insects. d-q The elephant has a long trunk, with which it breaks off branches from trees and puts them into its mouth. Elephant also has long tusks coming out from the mouth. Column A Column B a. Cow r. Chews the cud b. Mosquito s. Sharp mouthparts c. Frog p. Long, sticky tongue d. Elephant q. Long trunk

The ingestion of food is the process of intake of food by an organism and human beings ingest food through their mouth. The ingested food is processed by breaking the food into small pieces by the teeth which is then lubricated by the saliva so that it can be swallowed with the help of the tongue.

Match the items of column I with those given in column II. Column I Column II Food components Products of digestion (i) Carbohydrates (a) Fatty acids and glycerol (ii) Proteins (b) Sugar (Glucose) (iii) Fats (c) Amino acids

(i) - (b) Carbohydrates are sugars that are present in our food. The digestion of carbohydrates starts in the mouth. Polysaccharides such as starch are converted into maltose in the mouth which is further converted into glucose in the small intestine. (ii) - (c) Proteins are bodybuilding nutrients. These are macromolecules that are made up of many monomers called amino acids. There are a total of 20 amino acids. Digestion of proteins starts in the stomach where proteins are converted into peptones and proteoses which are further broken down to amino acids in the small intestine. (iii) - (a) Fats are macro nutrients that store energy. They break down into fatty acids and glycerol. They can be broken down by the bile juice secreted by the liver and the enzyme, lipase secreted by the stomach, mouth, and pancreas. Column I Column II Food components Products of digestion (i) Carbohydrates (b) Sugar (Glucose) (ii) Proteins (c) Amino acids (iii) Fats (a) Fatty acids and glycerol

The process of breakdown of complex food particles into simpler absorbable substances is known as digestion. The different steps in the digestion process are ingestion, propulsion, mechanical digestion, chemical digestion, absorption, and defecation.

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Choose the end product of fat digestion.

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Important Questions on The Human Digestive System

HARD

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

Which of the following is not a secretion in human beings?

EASY

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

We should not chew our food.

HARD

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

You have two test tubes ‘A’ and ‘B’. Test tube ‘A’ contains some pieces of boiled corns while the test tube ‘B’ contains boiled and chewed corns. Which test tube will give blue-black colour with iodine solution? Why?

MEDIUM

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

Why should we chew our food properly?

MEDIUM

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

If a piece of chapati is chewed for some time, it tastes sweeter. Why?

MEDIUM

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

Why do we get instant energy from glucose?

MEDIUM

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

Match the following:

Column A	Column B
1. Carbohydrates	(i) Fatty acids and glycerol
2. Proteins	(ii) Sugar
3. Fats	(iii) Amino acids

MEDIUM

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

Match the words in column A with those in column B.

Column A	Column B
a. Cow	p. Long, sticky tongue
b. Mosquito	q. Long trunk
c. Frog	r. Chews the cud
d. Elephant	s. Sharp mouthparts

EASY

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

Define ingestion.

EASY

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

How do cows and buffaloes eat their food? Name their way of eating.

MEDIUM

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

Why does the food you eat have to be digested?

MEDIUM

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

Match the items of column I with those given in column II.

Column I	Column II
Food components	Products of digestion
(i) Carbohydrates	(a) Fatty acids and glycerol
(ii) Proteins	(b) Sugar (Glucose)
(iii) Fats	(c) Amino acids

MEDIUM

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

If you skip your meals continuously for a few days, you start having problems with your digestion. Explain.

EASY

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

Saliva is produced here.

EASY

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

Saliva contains enzymes.

MEDIUM

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

What is meant by digestion? Name the various organs of the human digestive system. Also name the associated glands. Draw a labelled diagram of the human digestive system.

MEDIUM

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

What happens to the food in small and large intestines?

MEDIUM

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

What happens to the undigested food in the body?

EASY

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

Define digestion.

EASY

Science>Biology>The Human Digestive System>The Process of Digestion, Absorption and Assimilation

Define the following:

Digestion

Choose the end product of fat digestion.

Important Questions on The Human Digestive System

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