Question

1. What are the two steps of respiration?
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Answer 1

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♠Aerobic (“oxygen-using”) respiration occurs in three stages: glycolysis, the Krebs cycle, and electron transport.

♠ In glycolysis, glucose is split into two molecules of pyruvate. This results in a net gain of two ATP molecules.

♠ Life first evolved in the absence of oxygen, and glycolysis does not require oxygen.

Answer 2

Explanation:

Respiration take place in two stage.

1.External respiration = It means the exchange of gases form the environment and the body is called external respiration.

2.Internal respiration = It means the bio chemical processes involved in this respiration which break down the substance to release energy in take place in the tissu with the cell within the cells of organism thus, this process is calles internal respiration.