Question

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Experimentally show that carbon dioxide is given out during respiration.
class 10.

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Answer 1

Explanation:

Put some germinating seeds in a conical flask.

The conical flask is fitted to a delivery tube bent twice at right angles by means of cork.

Suspend a small test tube containing 20% potassium hydroxide.

Dip the free end of the bent tube in a beaker of coloured water.

Leave it for a day. Note the changes.

The germinating seeds respires aerobically by utilizing the oxygen in the flask.

Carbon dioxide released during the aerobic respiration is absorbed by potassium hydroxide and creates a vacuum and causes rise of water in the bent tube.

If we put a burning candle in the setup, the candle extinguishes which proves oxygen is utilized by germinating seed for respiration.

Answer 2

☘⫷❥ᴀ᭄n §₩ΣR⫸☘

One of the basic and fundamental life processes that are carried out by living entities is respiration. It is a catabolic process wherein complex organic molecules are broken down into simpler molecules. The process releases energy either in the absence or presence of oxygen and hence respiration can be of two kinds:

Aerobic respiration – This kind of respiration takes place in the presence of oxygen, hence it results in the complete glucose oxidation with the release of energy. It includes three stages – namely, Krebs cycle, ETS and Glycolysis. All events relating to ETS take place inside mitochondria while stages connected with glycolysis take place in the cytoplasm.

Anaerobic respiration – In this type of respiration, oxidation of food takes place in an environment lacking oxygen supply. Less energy is released as a result of incomplete oxidation of glucose.

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