21. NCERT objective based questions

5 m.

Choose the correct answer:

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

2. A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

3. Choose the correct statement that describes arteries.

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 high pressure;
They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body
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

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