Simple quiz

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Pisteet yhteensä: 60 %

Vastaukset

Tulos 1 / 1

Kysymys:

Multiple choice question

As plants respire, they release

carbon dioxide.

oxygen.

Vastaus:

oxygen.

carbon dioxide.

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Kysymys:

True/false question

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

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Vastaus:

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Kysymys:

True/false question

The rate of respiration decreases with temperature.

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Vastaus:

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Kysymys:

True/false question

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

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Vastaus:

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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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Kysymys:

True/false question

High soil moisture leads to decreased photosynthesis.

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Vastaus:

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

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Kysymys:

True/false question

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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Vastaus:

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Kysymys:

Multiple choice question

The annual cycle of photosynthesis mainly follows

the changes in light.

the changes in soil temperature.

the changes in air temperature.

the changes in CO2 concentration.

Vastaus:

the changes in CO2 concentration.

the changes in air temperature.

the changes in light.

the changes in soil temperature.

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Kysymys:

True/false question

When there is low soil moisture, plants close its stomata pores which then decreases photosynthesis.

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Vastaus:

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Kysymys:

Multiple choice question

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

soil heat.

sun light.

atmospheric oxygen.

soil nutrients.

Vastaus:

atmospheric oxygen.

soil nutrients.

soil heat.

sun light.

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Kysymys:

True/false question

Transpiration decreases as air becomes drier.

Answer hidden

Vastaus:

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Kysymys:

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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Vastaus:

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Kysymys:

Multiple choice question

Photosynthesis of a tree canopy is driven or influenced by

atmospheric CO2.

photosynthetically active solar radiation (PAR).

air humidity (VPD).

air temperature (T).

soil moisture (REW).

the total leaf area (LAI).

Vastaus:

atmospheric CO2.

photosynthetically active solar radiation (PAR).

the total leaf area (LAI).

soil moisture (REW).

air humidity (VPD).

air temperature (T).

Tulos 1 / 1

Kysymys:

True/false question

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

Answer hidden

Vastaus:

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Kysymys:

True/false question

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

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Vastaus:

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Kysymys:

Multiple choice question

Photoinhibition means the decrease in photosynthesis due to

exposure to high temperature.

exposure to shortage of soil moisture.

exposure to excess of light.

exposure to excess of CO2.

Vastaus:

exposure to excess of CO2

exposure to shortage of soil moisture

exposure to high temperature

exposure to excess of light