The phenomenon which converts light energy into chemical energy is:

Provide the full names for the following abbreviations:
$(1)$ $PGA$
$(2)$ $OAA$

If $CO_2$ is released during respiration,why does the concentration of $CO_2$ in the atmosphere remain relatively constant?

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.

The detectable end product of photosynthesis is

Which of the following categories of photosynthetic plants has the lowest transpiration ratio $(TR)$?