6. How do villi increase the surface area?
7. State the location of salivary glands.
8. Why does the rate of breathing in aquatic animals is faster than other
9. In which organisms the cell membrane acts as the respiratory surface
Answers
Answer:
6)Villi is a finger like projections present in the small in the small intestine. It increases the surface area for the absorption of nutrients present in the food and it have a large number of blood vessels and transports the nutrient rich food to all parts of the body.
7) Salivary glands are located in the mouth and they secrete salivary amylase which breakdown complex food into simpler form.
8) The amount of oxygen present in the water us less than the amount of oxygen present in the atmosphere. Hence aquatic organisms has to breath faster to take in sufficient oxygen to survive.
9) Unicellular organisms does not have specialised organs for respiration as that of multicellular organisms. Hence they respite through their cell membrane.
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ANSWER:
6. Villi are the finger like projection seen in the intestine. These expand when when more food particles enter in the intestine. In order to digest the villi expands.
7. Salivary glands are located in the BUCCAL CAVITY.
8. This is because the amount of oxygen present in the water is lesser THAI the atmosphere. So in order to take oxygen fishes need to breath more but animals need to breath less.
9. All the unicellular organisms respire through the cell membrane. They use diffusion method to respire.
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