5 How are fats digested in our bodies? Where does this process take place?
6. What is the role of saliva in the digestion of food?
7 What are the necessary conditions for autotrophic nutrition and what are its by-
products?
& What are the differences between aerobic and anaerobic respiration? Name some
organisms that use the anaerobic mode of respiration.
g How are the alveoli designed to maximise the exchange of gases?
10. What would be the consequences of a deficiency of haemoglobin in our bodies?
11. Describe double circulation of blood in human beings. Why is it necessary?
12. What are the differences between the transport of materials in xylem and phloem?
13. Compare the functioning of alveoli in the lungs and nephrons in the kidneys with
respect to their structure and functioning.
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Answer:
saliva helps in the lubrication of food in mouth
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