Activity Questions for Nutrition and Respiration

Given below are some activities that will help you to relate the content of topics related to ‘Nutrition and Respiration’ to your daily lives. These activities will make you understand the various processes that take place in the living organisms. Perform theses activities and answer the questions given at the end of each activity.

Activity no.1

Apply a coat of Vaseline/cooking oil on a leaf of a potted plant, observe the leaf for 4-5 days.

Q.1. What happens to the leaf after 4-5 days?

Q.2. What is the reason for these observations.

Q.3. Which processes are effected when you coat the leaf with Vaseline?

Activity no.2

Chew a piece of bread for 3-4 minutes. Note the change in taste as you chew it.

Q.1. Describe the change in taste observed.

Q.2. Why is there a change in taste.

Q.3. Try to write a chemical equation to show the reaction due to which there is a change in taste.(Chemical formulae are not required)

Activity no.3

Take some starchy water that is obtained after boiling rice. Add 2-3 drops of this water to 4 glass bowls (small transparent katories or glasses), you can name them as A, B, C and D. Add a teaspoon of water to each glass bowl. Now add a teaspoon of your saliva to bowl B. Boil a teaspoon of your saliva over a candle flame for 20 seconds and add this to bowl- C. After 10 minutes add 4-5 drops of iodine in each bowl, except bowl D. Tabulate your observations in the following manner-

Glass Bowl	Quantity of Starchy water	Quantity of water	Quantity of saliva	Colour change observed after 10 minutes.
A
B
C
D

Give reasons for your observations.

Activity no.4

Take a ripe fruit (orange or mango) and place it in a poly-bag. Tie or paste the open end of the bag so that no air can get inside the bag. Leave it at room temperature for 3-4 days. Take out the fruit and observe.

Q.1. The fruit may be spoilt and may smell of alcohol. Give a reason for this observation.

Q.2. Which type of microorganisms could be responsible for spoiling the fruit. Do they respire in presence of oxygen of absence of oxygen.

Q.3. Try to write a chemical equation to show the reaction due to which there is a change in smell.(Chemical formulae are not required)

2. Answer the following questions:

2.1 What would happen if :

a) Amoeba did not have pseudopodia

b) Liver did not secrete bile juice

c) Rings of cartilage were not present in the throat.

d) Blood did not have haemoglobin

e) There was no transpiration in plants

f) Villi in small intestine did not have blood vessels.

2.2 Differentiate between:

a) Arteries and veins

b) Large intestine and small intestine

c) Aerobic and anaerobic respiration

d) Blood and lymph

e) Mesophyll cells and epidermal cells of a leaf

f) Respiration in man and fish.

More Questions for 'Nutrition and Respiration'

Life Processes

(Nutrition and Respiration)

Very Short Answer Questions

1. Which process fulfils the carbon and energy requirements of autotrophic organisms?

2. In what form are carbohydrates usually stored in a) Plants, b) animals.

3. Write the chemical equation for photosynthesis.

4. Name two parasitic plants.

5. Name two parasitic animals.

6. Name the energy currency of the cell.

Short Answer Questions

1. What is the basic characteristic that you would look for in an organism to determine whether it is alive or not?

2. Why are molecular movements needed for life?

3. Why are maintenance processes required in living organisms?

4. Why are enzymes known as biocatalysts?

5. How do plants obtain nitrogen?

6. How is the mode of nutrition in bread moulds different from mode of nutrition in man?

7. When we eat something we like, our mouth waters. Give the scientific reason behind this.

8. Is it right to say that digestion starts in mouth? Give reasons for your answer.

9. How does the food move in the human alimentary canal?

10. What is the role of HCl in digestion of proteins?

11. How is the exit of materials controlled from stomach and anus?

12. Plants may not release C0₂ during day. Explain.

13. How do aquatic animals get oxygen?

14. What is the function of fine hair present in our nostrils?

15. Rings of cartilage that surround the air passage play an important role. Discuss.

16. How are CO₂ and O₂ transported in the human body?

17. What is the role of respiratory pigment in human beings?

Short Answer Questions

1. Define the following terms: Life Processes, Respiration, Nutrition, excretion

2. Explain the most common method of molecular breakdown for release of energy in living organisms.

3. ‘Survival of heterotrophs depends directly or indirectly on autotrophs.’ Explain

4. List the major events that occur during photosynthesis.

5. How is photosynthesis in desert plants different from photosynthesis in other land plants?

6. How do plants obtain CO₂ ?

7. How do stomata open and close?/

8. How does paramecium obtain food?

9. When we chew a piece of bread or chapatti for 2-3 minutes, it starts tasting sweet. Explain.

10. What would happen if mucus was not present in the inner lining of stomach?

11. What is the relationship between small intestine and food habit of animals?

12. Why is emulsification of fats necessary in the digestive system? How is it achieved?

13. Explain how the digested food enters our blood stream.

14. What is the function of pancreas?

15. Fill in the blanks:

Breakdown of ____________ , which is a 6-carbon compound, to _______________ which is a 3- carbon compound, takes place in the _____________. Then , this 3- carbon compound moves to ____________ where it is further broken using oxygen.

16. What is the cause of muscle fatigue in athletes?

17. Differentiate between aerobic and anaerobic respiration.

18. Rate of breathing in aquatic animals is faster than terrestrial animals. Explain.

19. What is the similarity between organs that absorb oxygen in different animals?

20. Lungs are designed in humans to maximise gaseous exchange. Explain.

Long Answer Questions

1. Simple diffusion process for various activities like taking in food, exchange of gases etc. is not sufficient in multicellular organisms. Why? What is the solution to this problem?

2. Explain the process of nutrition in amoeba.

3. Explain the function of glands associated with the digestive system of man.

4. The fate of pyruvate would differ in yeast, man and a man involved in heavy physical exercise. Explain.

5. Draw neat , well labelled diagrams of:

a) Stomata

b) Digestive system in humans

c) Respiratory system in humans.

Try this before starting the Topic-Nutrition and Repiration

1. What is the meaning of the word ‘sapro’?
2. Name a parasitic plant and a parasitic animal.
3. Besides human beings, name two organisms that exhibit holozoic nutrition.
4. Name the two types of photoreceptor molecules present in plants.
5. Expand – ATP, NADP.
6. Name the products produced during light reaction that are utilized in the dark reaction.
7. Name the chloroplast containing tissue in the leaves.
8. Name the most common types of chlorophyll present in green plants.
9. Which molecule accepts CO₂ in the dark reaction?
10. Which is the ideal temperature for photosynthesis.
11. What is the process of obtaining food known as?
12. Name the excretory organs of grasshoppers.
13. How does grasshopper obtain food?
14. What is the approximate length of the human alimentary canal?
15. Which structures in amoeba are involved in ingesting food?
16. Name three glands associated with human digestive system.
17. Name the parts that provide enzymes in the digestive system of grasshopper.
18. Name the enzyme present in human saliva.
19. Which enzyme converts starch to maltose in human beings?
20. The stomach environment is acidic due to the presence of which substance?
21. What are the finger-like-projections in the small intestine known as?
22. What is the function of pepsin?
23. Which substance emulsifies fats present in food?
24. Hoe does the duodenal environment become alkaline?
25. What are the components of bile?
26. Which gland of the human digestive system secretes enzymes and hormones?
27. In what form is the energy released during respiration stored?
28. Hoe does exchange of gases take place in the tree trunk?
29. Where does anaerobic respiration take place in the human body?
30. Name two end products of anaerobic respiration.
31. What are extensions of epidermal cells of root known as?
32. Which process is responsible for respiratory gas exchange in leaves?
33. Name the respiratory organs in mussels.
34. Name the respiratory organ in earthworm.
35. Name the respiratory organs in housefly. .
36. Which structure separates nasal cavity from the oral cavity?
37. Which structure prevents the trachea from collapsing?
38. How is the thoracic cavity separated from the abdominal cavity?
39. Name the structure that prevents entry of food into the windpipe.
40. What is the protruding cartilage of voice box in males known as?
41. How many vocal cords are present in the larynx?
42. What is the rate of breathing in human beings under normal conditions?
43. In which cavity are the lungs present?
44. How is oxygen transported from lungs to other parts of the body?
45. In which disease is the area for gaseous exchange in the lungs reduced?
46. Which part of the root is involved in exchange of respiratory gases?
47. Name a unicellular organism that respires anaerobically.
48. Which ‘juice’ is involved in the complete digestion of food in the small intestine?
49. Name the enzymes present in pancreatic juice.
50. How many salivary glands are associated with the human digestive system?