Question

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

Answer 1

Hint:Photosynthesis is defined as the transformation of photonic energy into chemical energy. Photosynthesis occurs in the green parts of the plant. \[{C_4}\] and \[{C_3}\] are the cycles of photosynthesis which occur in the \[{C_4}\] and\[{C_3}\] 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 \[{C_3}\] 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 \[{C_3}\] plants at a drawback in drought and high-temperature environments.
>Plants which evolved \[{C_4}\] cycle of photosynthesis to decrease these losses in hot, dry environments.
>In \[{C_4}\] 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 \[C{O_2}\] generated during photorespiration is recycled through PEP carboxylase.

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