PLANT PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Above average precipitation
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Changing the daylight hours from 14 hrs to 10 hrs
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Changing the CO2 concentration from 380 ppm to 410 ppm
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All of these choices
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Detailed explanation-1: -If the temperature and light intensity is too high or low, there is an immediate decline in the rate of photosynthesis.
Detailed explanation-2: -There are several limiting factors which can reduce the rate of photosynthesis, eg temperature, light intensity and carbon dioxide concentration.
Detailed explanation-3: -At low light intensities, above the light compensation point (LCP), photosynthetic rate increases proportionally to the light intensity and reaches a maximum. However, as light intensity is increased further, chlorophyll can get damaged and as a result the rate of photosynthesis decreases.
Detailed explanation-4: -With too little light, photosynthesis cannot occur either and the plant suffers without the production of sugars.
Detailed explanation-5: -At high intensities, the temperature of the plant increases which leads to increased transpiration in the plant. This leads to the closing of the stomata which leads to a reduced CO2 intake. Thus, leading to a reduction and finally stoppage of photosynthesis. Therefore, excessive light inhibits photosynthesis.