Kysymys:
Photoinhibition means the decrease in photosynthesis due to
exposure to high temperature.
exposure to excess of light.
exposure to excess of CO2.
exposure to shortage of soil moisture.
Vastaus:
Plants open its stomata to avoid losing too much water.
Plant closes its stomata to avoid losing too much water.
The annual cycle of photosynthesis mainly follows
the changes in soil temperature.
the changes in light.
the changes in air temperature.
the changes in CO2 concentration.
What is the source of carbon that is assimilated in photosynthesis?
Soil water
Atmospheric CO2
Solar radiation
Soil nutrients
To transform atmospheric CO2 into organic molecules, plants can use the energy from
atmospheric oxygen.
soil nutrients.
soil heat.
sun light.
In some part of the stems, some photosynthesis may also occur.
In general, the more carbon dioxide that is available to the plant, the faster the rate of photosynthesis - if other factors are favourable.
Early spring is a tricky time for plants due to the combination of sunny but still quite cold days.
Transpiration decreases as air becomes drier.
Almost half of the total biomass of a tree may be allocated to the roots.
When there is low soil moisture, plants close its stomata pores which then decreases photosynthesis.
The effect of light on photosynthesis has a clear saturating pattern: more light results in more photosynthesis but eventually leaves cannot take full advantage of all the extra light.
At low air humidity, a plant closes its stomata to prevent transpiration. The action also decreases photosynthesis
The rate of respiration decreases with temperature.
Photosynthesis of a tree canopy is driven or influenced by
atmospheric CO2.
the total leaf area (LAI).
air temperature (T).
air humidity (VPD).
soil moisture (REW).
photosynthetically active solar radiation (PAR).
