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1. In order for blood to always flow unidirectionally through a closed circulato

ID: 255508 • Letter: 1

Question

1. In order for blood to always flow unidirectionally through a closed circulatory system, the ________.

a. capillaries must have a thick endothelium

b. arteries must be elastic

c.pressure in all vessels must be equal

d.blood vessels farthest from the heart must have valves

2. Which one of the following does not correctly match the form with its function?

d. xylem sap: water and minerals are transported from shoots to roots

3. If you place flaccid plant cells in pure water, water ________ into cell because it has ________.

a. roots: water and minerals in the soil are absorbed b. phloem sap: products of photosynthesis are transported from roots to shoots c. leaves: sugars are produced by photosynthesis

d. xylem sap: water and minerals are transported from shoots to roots

3. If you place flaccid plant cells in pure water, water ________ into cell because it has ________.

a. does not enter the cell; solutes and low water potential b. enter the cell; solutes and high water potential c. enter the cell; solutes and low water potential d. does not enter the cell; solutes and high water potential

Explanation / Answer

1. The correct answer is option d.blood vessels farthest from the heart must have valves.

As the blood has to travel against gravity from the lower limbs to the top of the body, the veins have valves to prevent reverse flow of blood.

Capillaries have a thin endothelium. Hence, option A is wrong. Arteries are elastic so that they can regulate blod flow demands, and cope up with sudden surge in flow of blood as heart pumps the blood. Elasticity has nothing to do with direction of flow. Pressure in all vessels is not equal. Arteries have high pressure and veins have low pressure comparatively.

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