Question

A leafy plant shoot, plus the beaker of water in which it was placed, weighed 305 grams. Two hours later, it weighed 280 grams. An identical beaker of water, without a plant, lost 4 grams over the same length of time. What was the rate of transpiration of the plant per hour?
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Answer 1

Answer:

Explanation:

Transpiration is a process that involves loss of water vapour through the stomata of plants. Transpiration is thought to be a 'necessary cost or evil' to allow the plant to absorb water from the soil. It is an inevitable process.

Cooling of the plant: the loss of water vapour from the plant cools down the plant when the weather is very hot.

The transpirational pull: when the plant loses water through transpiration from the leaves, water and mineral salts from the stem and roots moves, or is `pulled', upwards into the leaves. Water and is therefore taken up from the soil by osmosis and finally exits the plants through the stomata.

Plant structure: young plants or plants without woody stems require water for structural support. Transpiration helps maintain the turgidity in plants.

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