Assertion : Cyclic pathway of photosynthesis | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The cyclic pathway of photosynthesis is considered the most primitive form of photosynthesis,which first appeared in ancient eubacterial species (

Vedclass · Accepted Answer

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

Vedclass · Answer

(A) The cyclic pathway of photosynthesis is considered the most primitive form of photosynthesis,which first appeared in ancient eubacterial species (like purple and green sulfur bacteria) that did not evolve oxygen.Non-cyclic photophosphorylation ($Z$-scheme) involves the photolysis of water,which releases $O_2$ as a byproduct.As non-cyclic photosynthesis evolved,oxygen began to accumulate in the atmosphere,leading to the oxygenation of the Earth's atmosphere.Both the Assertion and Reason are correct,and the evolution of the non-cyclic pathway is the reason for the accumulation of atmospheric oxygen,which distinguishes it from the primitive cyclic pathway.

Assertion : Cyclic pathway of photosynthesis first appeared in some eubacterial species.
Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.

Similar Questions

The principal section of a glass prism is an isosceles triangle $ABC$ with $AB=AC$. The face $AC$ is silvered. $A$ ray of light is incident normally on the face $AB$ and after two reflections,it emerges from the base $BC$ perpendicular to the base. Angle $BAC$ of the prism is (in $^{\circ}$)

Acid hydrolysis of $X$ yields two different organic compounds. Which one of the following is $X$?

$A$ ring of radius $4a$ is rigidly fixed in a vertical position on a table. $A$ small disc of mass $m$ and radius $a$ is released as shown in the figure. When the disc rolls down,without slipping,to the lowest point of the ring,then its speed will be

Enzymes are

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Assertion : Cyclic pathway of photosynthesis first appeared in some eubacterial species.Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.