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Preparation of Dioxygen

Why is respir...

Question

Why is respiration a chemical change?

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Solution

Respiration is a continuously occurring biological process. In this process, we inhale the air and exhale carbon dioxide and water vapour.
After an in-depth study, it is learnt that glucose in the cells reacts with oxygen in the inhaled air to form carbon dioxide and water.

Glucose + Oxygen $\to$ Carbon dioxide + Water

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Q. Given below are chemical reactions ( 1 to 5) involving glucose and five other chemical products (A-E).
(a) Write the reaction number of the following:
(i) Anaerobic respiration in plants.
(ii) End-products in aerobic respiration.
(iii) Reaction occurring in liver.
(iv) Anaerobic respiration in animals.
(v) Storage in the liver.
(b) Which reactions (1-5) in the above correspond to the following (write the corresponding number of reaction next to them).
(i) Aerobic respiration.
(ii) Change taking place in the liver.
(iii) Anaerobic respiration in yeast.
(iv) Change taking place in a plant storage organ – e.g. potato.
(v) Anaerobic respiration in animals.

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