Fill in the blanks:

(a) The main steps of nutrition in humans are __________, __________, __________, _________ and __________.

(b) The largest gland in the human body is __________.

(c) The stomach releases hydrochloric acid and ___________ juices which act on food.

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

(e) Amoeba digests its food in the ____________.

Mark (T) if the statement is true and (F) if it is false:

(a) Digestion of starch starts in the stomach. (T/F)

(b) The tongue helps in mixing food with saliva. (T/F)

(c) The gall bladder temporarily stores bile. (T/F)

(d) The ruminants bring back swallowed grass into their mouth and chew it for some time. (T/F)

Tick (√) mark the correct answer in each of the following:

(a) Fat is completely digested in the

(i) stomach

(ii) mouth

(iii) small intestine

(iv) large intestine

 

(b) Water from the undigested food is absorbed mainly in the

(i) stomach

(ii) food pipe

(iii) small intestine

(iv) large intestine

Match the items of Column I with those given in Column II:

Column I                                              Column II

Food components                         Product(s) of digestion

Carbohydrates                              Fatty acids and glycerol

Proteins                                         Sugar

Fats                                               Amino acids

What are villi? What is their location and function?

Where is the bile produced? Which component of the food does it help to digest?

Name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also.

Why do we get instant energy from glucose?

Which part of the digestive canal is involved in:

(i) absorption of food ________________.

(ii) chewing of food ________________.

(iii) killing of bacteria ________________.

(iv) complete digestion of food ________________.

(v) formation of faeces ________________.

Write one similarity and one difference between the nutrition in amoeba and human beings.

Match the items of Column I with suitable items in Column II

Column I                              Column II

(a) Salivary gland                (i) Bile juice secretion

(b) Stomach                        (ii) Storage of undigested food

(c) Liver                               (iii) Saliva secretion

(d) Rectum                          (iv) Acid release

(e) Small intestine             (v) Digestion is completed

(f) Large intestine               (vi) Absorption of water

                                              (vii) Release of faeces

Label Fig. 2.11 of the digestive system.

Can we survive only on raw, leafy vegetables/grass? Discuss.