CLASS 10 - SCIENCE
Module:2 Assessment on Heterotrophic nutrition
I. Very short answer questions (1 mark each)
1. Which pancreatic enzyme is effective in digesting protein?
2. Which enzyme present in saliva breaks down starch?
3. What is the role of acid in our stomach?
4. What is the role of saliva in the digestion of food?
5. State the function of digestive enzymes.
6. Where does digestion of fat take place in our body?
7. Mention how organisms like Bread Mould and Mushroom obtain their food.
8. State one difference between autotrophic and heterotrophic modes of nutrition.
9. What causes movement of food inside the alimentary canal?
10. What is the significance of emulsification of fats?
II. Short answer questions (2marks)
11. (a) How are fats digested in our body?
(b) What is called emulsification?
12. Name any two digestive enzymes secreted in the human digestive system and write their functions?
13. What will happen if mucus is not secreted by gastric glands?
14. (i) Name two organisms that obtain food through parasitic nutritive strategy.
(ii) How do fungi obtain their food?
15. Define peristalsis and give its significance.
16. What is the importance of nutrition?
17. If you chew a piece of bread for a long time it tastes sweet. Why?
18. Name two enzymes present in pancreatic juice and give their functions.
19. How dental caries is caused?
20. List out the various types of heterotrophic nutrition give one example each.
III. Three marks questions:
21. Why is small intestine in herbivore longer than in carnivores?
22. Why does absorption of digested food occur mainly in the small intestine?
23. Write the functions of the following in the digestive process:
(i) Bile (ii) Bicarbonate secreted by duodenal wall (iii) Pancreatic amylase
24. “Bile juice does not contain any enzyme but is essential for digestion.” Justify the statement.
25. With the help of a neat labelled diagram show how Amoeba captures its food.
Answers
Answer:
Heterotrophic nutrition : is a mode of nutrition in which organisms depend upon other organisms for food to survive. They can't make there food own like Green plants. Heterotrophic organisms have to take in all the organic substances they need to survive. for examples : animals , humans etc.
Explanation:
Hetrerotrophs : are organisms whos mode of nutrition is heterotrophic.
There are four different types of heterotrophs which include
1 Herbivores 3 omnivores
2 carnivores 4 Decomposers
1 pancreatic enzyme is effective in digesting protein?
Proteases break down proteins. They help keep the intestine free of parasites such as bacteria, yeast and protozoa. Shortage may cause: Allergies or the formation of toxic substances due to incomplete digestion of proteins.;
2 enzyme present in saliva breaks down starch?
Salivary amylase is a glucose-polymer cleavage enzyme that is produced by the salivary glands. It comprises a small portion of the total amylase excreted, which is mostly made by the pancreas.
3 role of acid in our stomach?
Stomach secretions are made up of hydrochloric acid, several enzymes, and a mucus coating that protects the lining of your stomach. Hydrochloric acid helps your body to break down, digest, and absorb nutrients such as protein. It also eliminates bacteria and viruses in the stomach, protecting your body from infection.
4 function of digestive enzymes.
Digestive enzymes play a key role in breaking down the food you eat. These proteins speed up chemical reactions that turn nutrients into substances that your digestive tract can absorb.
5 digestion of fat take place in our body?
Small intestine
The majority of fat digestion happens once it reaches the small intestine. This is also where the majority of nutrients are absorbed. Your pancreas produces enzymes that break down fats, carbohydrates, and proteins. Your liver produces bile that helps you digest fats and certain vitamins.