Question

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Answer 1

Answer:

(i)If you talk while you eat, that valve needs to remain "open" and you might get food into your lungs, which is generally a Bad Idea.

If your upper body is upright, gravity will do good job of getting food into your stomach. If you lie flat, there's only muscular contractions moving the food along.

(ii)No, the step taken by the yatika was not right. The electric bulb wastes electrical energy in the form of heat. As she covered the bulb of her room with a towel in the night to get dim light, is a total wastage of energy.

(iii)such as cow, deer and goat eat mainly grass and other plant leaves as food. Grass is rich in carbohydrates called cellulose which is a quite tough material and difficult to digest. These animals have cellulose-digesting bacteria present in their stomach which helps to digest cellulose. They quickly swallow the grass and store it in the rumen, where the food gets partially digested and is termed cud. The cud returns to the mouth in small lumps and the animal chews it. This process is termed rumination, and these animals are called ruminants.

(iv)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 into small droplets. After this process, it can digest easily. If the gall bladder is removed from human body then it will be difficult to digest fat.

(v)No, we cannot survive only on raw, leafy vegetables/ grass.Humans cannot survive only on raw, leafy vegetables or grass. The grass is rich in cellulose, which is a type of carbohydrate that humans are not able to digest due to the absence of cellulose-digesting enzymes. Also, our body requires all kinds of nutrients like protein, vitamins, minerals and fats. So a human cannot survive only on raw, leafy vegetables. Besides, relative to cooked vegetables, raw vegetables cannot be digested easily.

Explanation: