(a) Why do ventricles have thicker, muscular walls than atria ?
(b) What are peristaltic movements?
(c) 'Stomata remain dosed in desert plants during day time.' How do they do photosynthesis ?
CBSE Class X Science SA 2 (3 Marks)
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(a) Since ventricles have to pump blood into various organs, they have thicker muscular walls
than atria do.
(b) The lining of alimentary canal has muscles that contract rhythmically in order to push the food forward. These are peristaltic movements.
(c) In desert plant, stomata open at night and absorb CO2, and store it as an intermediate compound, that is converted to carbohydrate during the day time.
(b) The lining of alimentary canal has muscles that contract rhythmically in order to push the food forward. These are peristaltic movements.
(c) In desert plant, stomata open at night and absorb CO2, and store it as an intermediate compound, that is converted to carbohydrate during the day time.
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Answer:
(a) Since ventricles have to pump blood into various organs, they have thicker muscular walls than atria do.
(b) The lining of alimentary canal has muscles that contract rhythmically in order to push the food forward. These are peristaltic movements.
(c) In desert plant, stomata open at night and absorb CO2, and store it as an intermediate compound, that is converted to carbohydrate during the day time.
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