Biology class 3rd JUNE 2021

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 The rate of photosynthesis process is affected by several external ( enviromental) internal factor, these factors are

Temperature

Light

Water

Carbon dioxide


1. Light

The ultimate source of light for photosynthesis is solar radiation. Out of total solar energy reaching to the earth, only a very small portion ( about 2%) is used in photosynthesis.

Light varies in intensity, quality ( wavelength ) and duration.

Under low light intensity the rate of photosynthesis is also low.

At very high light intensity the photosynthesis is decreased due to photo oxidation of constituents.

The quality or wavelength of light also affect photosynthesis. For eg. Green pigment chlorophyll mostly absorb blue and red light they reflect green light. Therefore photosynthesis is high in blue or red light and very low in green light


2. Temperature

The rate of photosynthesis increase by increase in temperature upto 40°C. Above 40°C there is decrease in photosynthesis process.

Similarly low temperature also stop photosynthesis.

The temperature mainly affect the activity of enzymes.


3. Carbon dioxide

Carbon dioxide present in atmosphere ( 0.032 ). The rate of photosynthesis increase by increasing the amount of carbon dioxide in atmosphere.

Very high amount of carbon dioxide become toxic plants and stop it inhibit photosynthesis.


4. Water

Less than 1% of water absorbed by plant is used in photosynthesis however the rate of photosynthesis is slower if plant not gets proper amount of water.

Under water deficient condition the stomatal apparatus remain closed to reduce the loss of water by transpiration as a consequence the entry of carbon dioxide is also stop into the leaves.


THANK YOU so much 

Dewanshu rai 

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