Answer:
(a)
During daytime rate of photosynthesis is more than the rate of respiration. The
oxygen is given out in day time. At night, due to absence of sunlight
photosynthesis will not occur but respiration takes place. So, net result is
evolution of carbon dioxide more than oxygen. (2)
(b) The differences between autotrophic and heterotrophic
nutrition are
(3)
S. NO.
Autotrophic Nutrition
Heterotrophic
Nutrition
(i)
Organisms make their own food.
Organisms depend on other for their food.
(ii)
Organism contains chlorophyll. e.g., green plants.
Organisms do not possess chlorophyll. e.g., all human
being.
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