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Question: \[{C_4}\]plants are photosynthetically more efficient than \[{C_3}\] plant because A) \[C{O_2}\] e...

C4{C_4}plants are photosynthetically more efficient than C3{C_3} plant because
A) CO2C{O_2} efflux is not prevented
B) They are able to avoid photorespiration
C) CO2C{O_2} compensation point is more
D) CO2C{O_2} generated during photorespiration is recycled through PEP carboxylase

Explanation

Solution

Photosynthesis is defined as the transformation of photonic energy into chemical energy. Photosynthesis occurs in the green parts of the plant. C4{C_4} and C3{C_3} are the cycles of photosynthesis which occur in the C4{C_4} andC3{C_3} plants respectively.

Complete Answer:

In photosynthesis, plants use light, carbon dioxide, and water to convert into sugars by using the enzyme Rubisco which is the primary photosynthetic enzyme.
Mainly the species of plant uses C3{C_3} photosynthesis, in which the first carbon compound which is formed in the photosynthesis cycle contains three carbon atoms. In this cycle, carbon dioxide enters a plant by its stomata.
Stomata having the microscopic pores on plants leave.
The enzyme Rubisco changes carbon into sugar by the Calvin-Benson cycle.
There is two key problems which slow down photosynthesis:
Rubisco aims to change carbon dioxide, but also change oxygen molecules. It makes a toxic two-carbon compound. Rubisco used the energy for photorespiration to remove the toxic carbon compound which was rather used to photosynthesize.
When stomata are receptive to let carbon dioxide in, they conjointly let water vapor out, leaving C3{C_3} plants at a drawback in drought and high-temperature environments.
Plants which evolved C4{C_4} cycle of photosynthesis to decrease these losses in hot, dry environments.
In C4{C_4} photosynthesis, a four-carbon compound is produced and carbon dioxide concentrates in 'bundle sheath' cells around Rubisco. These bundle sheaths help to deliver the carbon dioxide directly to >Rubisco which effectively removes its contact with oxygen and the need for photorespiration.

So, the correct answer CO2C{O_2} generated during photorespiration is recycled through PEP carboxylase.

Note: C4{C_4} plants avoid photorespiration because they have the enzyme called PEP during the first step of carbon fixation.