DENDROLOGY

TREE PHYSIOLOGY

PHOTOSYNTHESIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
When it is cold and wet outside, photosynthesis may not be able to take place. What is the limiting factor?
A
Temperature
B
Rainfall
C
Carbon Dioxide
D
None of the above
Explanation: 

Detailed explanation-1: -At lower temperatures, the number of molecular collisions between the substrate and the enzymes limits the pace of photosynthesis. A temperature range of 25° to 35° C is required for photosynthesis to be carried out efficiently.

Detailed explanation-2: -Light Intensity Since photosynthesis cannot begin without light, it is the first limiting factor. Plants use chlorophyll, usually found in their leaves, to absorb sunlight. The light energy from the sun is what fuels the reactions that transform carbon dioxide and water into glucose and oxygen.

Detailed explanation-3: -Low temperature depresses the rate of photosynthesis both directly and indirectly, either by influencing the activity of photosynthetic enzymes involved in the Calvin cycle, such as Rubisco (Yamori et al., 2010), or by reducing stomatal conductance (Allen et al., 2002).

Detailed explanation-4: -As with any other enzyme-controlled reaction, the rate of photosynthesis is affected by temperature. At low temperatures, the rate of photosynthesis is limited by the number of molecular collisions between enzymes and substrates. At high temperatures, enzymes are denatured .

Detailed explanation-5: -Temperature is a limiting factor for photosynthesis.

There is 1 question to complete.