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Large intestine absorbs and some from the undigested food.

(b) Large intestine absorbs water and some salts from the undigested food. The large intestine reabsorbs the water from indigestible food... View Article

The digestion of all food components is completed by the ____________ juice.

Intestinal juice The digestion of all food components is completed by the intestinal juice .These are a group of enzymes which help in complete... View Article

Boojho and Paheli were eating their food hurriedly so that they could go out and play during the recess. Suddenly, Boojho started coughing violently. Think of the reasons why he was coughing and discuss with your friends.

Sometimes when anyone eats hurriedly, talks, laughs or does another similar activity while eating, the flap such as valve, epiglottis closing... View Article

Ruminants such as cows and buffaloes swallow their food hurriedly and then sit restfully and chew their food. Can you reason why?

Ruminants such as cows and buffaloes chew the food quickly and swallow it. This swallowed food is brought back from the stomach to mouth and... View Article

‘A’ got her gall bladder removed surgically as she was diagnosed with stones in her gall bladder. After the surgery, she faced problems in the digestion of certain food items when consumed in bulk. Can you tell which kind of food items would they be and why?

Bile juice is produced by the liver that is collected and stored in a location named gall bladder. The main role of bile juice is to break fat... View Article

Boojho took some grains of boiled rice in a test tube ‘A’ and Paheli took boiled and chewed rice in a test tube ‘B’. Both of them poured 1 – 2 drops of iodine solution into the test tube and observed the colour change. What colour change would they have observed? Give reasons for your answer.

In test-tube A, the boiled rice contains starch. When we add 1-2 drops of iodine, the combination turns in the shade of blue-black. This... View Article

Following statements describe the five steps in animal nutrition. Read each statement and give one word for each statement. Write the terms that describe each process. (a) Transportation of absorbed food to different parts of the body and their utilisation. (b) Breaking of complex food substances into simpler and soluble substances. (c) Removal of undigested and unabsorbed solid residues of food from the body. (d) Taking food into the body. (e) Transport of digested and soluble food from the intestine to blood vessels.

The terms that describe each process are: a) Transportation of absorbed food to different parts of the body and its utilisation: Assimilation b)... View Article

Fill in the blanks with suitable words: (a) The alimentary canal stretches from ___ to _. (b) Teeth are rooted in separate in between the _. (c) Digestion of food starts in _ and gets completed in _. (d) ___ is the largest gland in the human body.

(a) The alimentary canal stretches from the buccal cavity to the anus. buccal cavity is the starting point of alimentary canal, while it... View Article

You were blindfolded and asked to identify the drinks provided in two different glasses. You could identify drink A as lime juice and B as bitter gourd juice. How could you do it in spite of being blindfolded?

In the tongue different types of taste buds are present These taste buds help to identify the various types of tastes such as spicy, salty, sweet... View Article

Choose the odd one out from each group and give reasons. (i) liver, salivary gland, starch, gall bladder (ii) stomach, liver, pancreas, salivary gland (iii) tongue, absorption, taste, swallow (iv) oesophagus, small intestine, large intestine, rectum

(i) Starch : liver, salivary gland and gall bladder are all parts of the alimentary canal. They either produce an enzyme or store it. It... View Article

Mark the following statements as True or False. If false, write the correct statements. (a) Tongue is attached to the roof of the mouth cavity at the back. (b) The large intestine is longer and wider than the small intestine of the human alimentary canal. (c) Mucus protects the stomach lining from damage. (d) All heterotrophs have a similar basic process of nutrition.

(a) True. Our tongue is attached to the roof of the mouth cavity at the back and the front is free moving. (b) False. The large intestine is... View Article

Name the parts of the alimentary canal where (i) water gets absorbed from undigested food. (ii) digested food gets absorbed. (iii) taste of the food is perceived. (iv) bile juice is produced.

Name the parts of the alimentary canal where (i) The part of alimentary canal where water gets absorbed from the undigested food is the large... View Article

Cellulose-rich food substances are a good source of roughage in human beings because (a) human beings do not have cellulose-digesting enzymes. (b) cellulose gets absorbed in the human blood and converts into fibres. (c) the cellulose-digesting bacteria convert cellulose into fibres. (d) cellulose breaks down into smaller components which are egested as roughage.

a)Human beings do not have cellulose-digesting enzymes Cellulose-rich food substances are a good source of roughage for human beings because... View Article

Choose the correct order of terms that describes the process of nutrition in ruminants. (a) swallowing → partial digestion → chewing of cud → complete digestion (b) chewing of cud → swallowing → partial digestion → complete digestion (c) chewing of cud → swallowing → mixing with digestive juices → digestion (d) swallowing → chewing and mixing → partial digestion → complete digestion

a) Swallowing → Partial digestion → Chewing of cud → Complete digestion The digestion process in Ruminants begins by chewing and... View Article

Cud is the name given to the food of ruminants which is (a) swallowed and undigested. (b) swallowed and partially digested. (c) properly chewed and partially digested. (d) properly chewed and completely digested.

b) Swallowed and partially digested. Cud is the partially digested food in the rumen of ruminants like cow. Ruminants quickly swallow the grass... View Article

The enzymes present in the saliva convert (a) fats into fatty acids and glycerol. (b) starch into simple sugars. (c) proteins into amino acids. (d) complex sugars into simple sugars.

b) Starch into simple sugars. The saliva contains amylase enzyme that breaks down starch into simple sugar. Salivary enzyme could be a... View Article

The false feet of Amoeba is used for (a) movement only. (b) the capture of food only. (c) the capture of food and movement. (d) exchange of gases only.

c) Capture of food and movement Option A: Amoeba uses pseudopodia for ingestion also. Therefore, this is the incorrect option. Option B:... View Article

Read the following statements with reference to the villi of the small intestine. (i) They have very thin walls. (ii) They have a network of thin and small blood vessels close to the surface. (iii) They have small pores through which food can easily pass. (iv) They are finger-like projections. Identify those statements which enable the villi to absorb digested food. (a) (i), (ii) and (iv) (b) (ii), (iii) and (iv) (c) (iii) and (iv) (d) (i) and (iv)

a) (i), (ii) and (iv) Inner walls of the small intestine have thousands of finger-like outgrowths called villi (singular villus). Villi... View Article

The finger-like outgrowths of Amoeba help to ingest food. However, the finger-like outgrowths of human intestine help to (a) digest the fatty food substances. (b) make the food soluble. (c) absorb the digested food. (d) absorb undigested food.

(c) absorb the digested food. Vili are finger-like outgrowths of the human intestine. The main role of villi is to amplify surface area for the... View Article

The acid present in the stomach (a) kills the harmful bacteria that may enter along with the food. (b) protects the stomach lining from harmful substances. (c) digests starch into simpler sugars. (d) makes the medium alkaline.

a) Kills the harmful bacteria that may enter along with the food The acid present in the stomach is the Hydrochloric acid which is secreted by... View Article

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