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D Divya Prakash Singh
No. we cannot survive only on raw, leafy vegetables, or grass. It is because humans are not able to digest the cellulose present in the grass or leafy vegetables due to the absence of cellulose-digesting enzymes. 

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D Divya Prakash Singh
Labelled diagram shown in the figure below:

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D Divya Prakash Singh
Similarity between the nutrition in amoeba and human beings is that both are heterotrophs, they derive their nutritions from other organisms. Dissimilarity between them is that human beings have complex digestive system where food gets digested in separate regions while in amoeba food is digested in a food vacuole.

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D Divya Prakash Singh
(i) absorption of food small intestine. (ii) chewing of food buccal cavity. (iii) killing of bacteria stomach. (iv) complete digestion of food small intestine. (v) formation of faeces large intestine.

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D Divya Prakash Singh
The carbohydrates get broken into simple sugars as glucose.  In the cells, glucose breaks down with the help of oxygen into carbon dioxide and water, and it easily get absorbed in the blood hence we get instant energy from glucose.

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D Divya Prakash Singh
Cellulose is the type of carbohydrate that can be digested by ruminants but not by humans because, the cellulose of the food is digested by the action of certain bacteria which are not present in humans.

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D Divya Prakash Singh
Liver secretes bile juice that is stored in a sac called the gall bladder. The bile plays an important role in the digestion of fats.

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D Divya Prakash Singh

5. What are villi? What is their location and function?

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D Divya Prakash Singh
(a) False, Digestion of carbohydrates, like starch, begins in the buccal cavity. (b) True, The saliva breaks down the starch into sugars. (c) True, bile juice that is stored in a sac called the gall bladder. (d) True, In ruminants, bacteria present in rumen helps in digestion of cellulose.  

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D Divya Prakash Singh
(a) The main steps of nutrition in humans are ingestion, digestion, absorption, assimilation and egestion. (b) The largest gland in the human body is liver. (c) The stomach releases hydrochloric acid and digestive juices juices which act on food. (d) The inner wall of the small intestine has many finger-like outgrowths called villi (singular villus). (e) Amoeba digests its food in the food vacuole.  
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