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.
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