7. Multiple choice questions VII

3 m.

1. Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by

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

3. Choose the correct statement that describes arteries.

They have thin walls with valves inside, blood flows under low pressure and carry blood away from the heart to various organs of the body
They have thick elastic walls without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body.
They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body
They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart

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