Q21 of 79 Page 48

The filtration units of kidneys are called

The functional unit of human excretory system is nephrons. Urine formation takes place in nephrons of kidneys.

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19

In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body?

 20

Choose the correct statement that describes arteries.

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Oxygen liberated during photosynthesis comes from

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The blood leaving the tissues becomes richer in