Fore question no. 50.

animals get carbon dioxide as a result of process of respiration.In the process of respiration, Glucose is broken down into carbon dioxide and ATP molecules. So source of carbon dioxide in animals is Glucose. Starch is a storage of excessive glucose in Plants only. Animals store this excessive glucose in the form of glycogen. This glycogen is not directly burnt and converted into energy but first transformed into glucose and then into carbon dioxide and energy.

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