Worksheet Solutions: Life Processes in Animals

Q.1. True/False

(i) Digestion of starch starts in the stomach.

False

(ii) The tongue helps in mixing food with saliva.

True

(iii) The ruminants bring back swallowed grass into their mouth and chew it for some time. 

True

(iv) We chew the food with the teeth and break it down mechanically into small pieces. 

True

(v) Large intestine receives digested and absorbed food. 

False

Q.2. Fill in the blanks.

(i) The inner wall of the small intestine has many finger-like outgrowths called ____.

villi

(ii) We chew the food with the ____ and break it down mechanically into small pieces.

teeth

(iii) The process of breaking down complex food into simpler forms is called __________.

digestion

(iv) The finger-like projections in the small intestine that help in absorption are called __________.

villi

(v) The process of bringing back partially digested food to the mouth for chewing again in ruminants is called __________.

rumination

Answer the following Questions

Absorption of food takes place in small intestine.

Q.2. Where faeces are stored?

Faeces are stored in rectum.

Q.3. What does saliva do to food in our mouth?

The saliva breaks down the starch into sugars.

Q.4. What are ruminant animals?

The grazing animals like cows, buffaloes and deer are known as ruminants.

Q.5. What is mechanical digestion?

Mechanical digestion is the physical breakdown of food into smaller pieces by chewing and crushing in the mouth.

Q.6. How does saliva help in digestion?

Saliva moistens food and contains digestive juice that begins the digestion of starch by converting it into sugars.

Q.7. What is the function of alveoli in the lungs?

 Alveoli are tiny air sacs where exchange of gases occurs. Oxygen enters the blood, and carbon dioxide leaves the blood.

Q.8. How do fish breathe in water?

Fish breathe through gills, which absorb oxygen dissolved in water and release carbon dioxide.