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True/false question

De-hardening in spring involves gradual re-hydration of the cells, recovery of photosynthetic capacity and a tight control of water loss.

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Multiple choice question

To transform atmospheric CO2 into organic molecules, plants can use the energy from

soil nutrients.

sun light.

atmospheric oxygen.

soil heat.

Response:

sun light.

atmospheric oxygen.

soil nutrients.

soil heat.

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The rate of respiration decreases with temperature.

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Plant respiration captures CO2.

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Unlike photosynhesis, plant respiration captures atmospheric oxygen and releases carbon dioxide.

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Leaf area increases with stand age, resulting in a decreasing rate of photosynthesis in the stand.

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An increment in leaf area increases also the photosynthesis of a tree stand. However, the relationship is saturating.

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A complex microbiota lives belowground, releasing carbon dioxide to the soil.

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Plants open its stomata to avoid losing too much water.

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Plant closes its stomata to avoid losing too much water.

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High soil moisture leads to decreased photosynthesis.

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In boreal upland forests, low soil moisture decreases the rate of photosynthesis.

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Multiple choice question

The annual cycle of photosynthesis mainly follows

the changes in light.

the changes in CO2 concentration.

the changes in air temperature.

the changes in soil temperature.

Response:

the changes in light.

the changes in air temperature.

the changes in soil temperature.

the changes in CO2 concentration.

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Carbon capture is performed by the green parts of plants via photosynthesis.

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In general, the more carbon dioxide that is available to the plant, the faster the rate of photosynthesis - if other factors are favourable.

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Early spring is a tricky time for plants due to the combination of sunny but still quite cold days.

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At low air humidity, a plant closes its stomata to prevent transpiration. The action also decreases photosynthesis

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In some part of the stems, some photosynthesis may also occur.

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Question:

Multiple choice question

As plants respire, they release

carbon dioxide.

oxygen.

Response:

carbon dioxide.

oxygen.