question_answer 35)

Which of the following statements about the autographs is incorrect? (a) They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll (b) They store carbohydrates in the form of starch (c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight (d) They constitute the first trophic level in food chains

Answer:

                (c) It is incorrect as, autotrophs can convert carbon dioxide and water into carbohydrates only in the presence of sunlight. The autotrophs contain the green pigment called chlorophyll which is capable of trapping sun energy. This trapped energy is utilized by them to make food by combining inorganic materials likeCO2and H2O by the process of photosynthesis. The food that is not used immediately is stored in the form of starch. These autotrophs constitute the first trophic level in food chains.