Question

E. Give reasons for each of the following.
1. Animals are heterotrophic.
2. We should keep our teeth clean.
3. Chewing boiled rice for some time gives us a sweet taste.
4. Hydrochloric acid plays an important role in digestion.
5. Humans cannot digest cellulose.​

Answer 1

Answer:

1. Animals considered as heterotrophs because they can't cook their own food ,they only eat and absorb it for these reason they are also know as consumers .
2. To prevent cavities, you need to remove plaque, the transparent layer of bacteria that coats the teeth. The best way to do this is by brushing your teeth twice a day and flossing at least once a day. Brushing also stimulates the gums, which helps to keep them healthy and prevent gum disease
3. The process of digestion begins in the mouth. As you chew, you release saliva into your mouth. Your saliva begins to convert starches into sugars before the food even gets to your stomach, so the starch in the rice begins to taste sweeter as you chew it .
4. The gastric chief cells of the stomach secrete enzymes for protein breakdown (inactive pepsinogen, and in infancy rennin). Hydrochloric acid activates pepsinogen into the enzyme pepsin, which then aids digestion by breaking the amino acid bonds, a process called proteolysis.
5. Cellulose is indigestible because we lack the digestive machinery to break the bonds between the monosaccharides of cellulose and release the energy-rich glucose. Celllose is necessary to our diet because it is an excellent source of fiber.

Answer 2

Answer:

1.Living organisms that are heterotrophic include all animals and fungi, some bacteria and protists, and many parasitic plants. ... Comparing the two in basic terms, heterotrophs (such as animals) eat either autotrophs (such as plants) or other heterotrophs, or both.

2.To prevent cavities, you need to remove plaque, the transparent layer of bacteria that coats the teeth. The best way to do this is by brushing your teeth twice a day and flossing at least once a day. Brushing also stimulates the gums, which helps to keep them healthy and prevent gum disease.

3.The process of digestion begins in the mouth. As you chew, you release saliva into your mouth. Your saliva begins to convert starches into sugars before the food even gets to your stomach, so the starch in the rice begins to taste sweeter as you chew it.

4.The gastric chief cells of the stomach secrete enzymes for protein breakdown (inactive pepsinogen, and in infancy rennin). Hydrochloric acid activates pepsinogen into the enzyme pepsin, which then aids digestion by breaking the amino acid bonds, a process called proteolysis.

5.Cellulose is indigestible because we lack the digestive machinery to break the bonds between the monosaccharides of cellulose and release the energy-rich glucose. Celllose is necessary to our diet because it is an excellent source of fiber.

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