Question

Who stated that in photosynthesis light energy is converted into chemical energy?

Answer 1

Conversion of light energy into chemical energy is the important step of photosynthesis. This was proposed by the same scientist who proposed that the sun is the ultimate source of energy utilized by living organisms.

Complete answer:
R. Mayer stated that in photosynthesis light energy is converted into chemical energy. Photosynthesis is a process by which sugar molecules are produced using small molecules and light energy is used. It is also a type of redox reaction.
In photosynthesis, light energy is used for converting $CO_2$, water, and minerals into oxygen. In Photosynthesis electrons are transferred from water to $CO_2$ molecules, forming sugar molecules. In this process, the water is oxidized as it loses electrons and the $CO_2$ is reduced as it gains electrons. Hence photosynthesis is a reductive process.
The equation of photosynthesis is :
$6C{ O }_{ 2 }+6{ H }_{ 2 }O+light\rightarrow { C }_{ 6 }\underset { GLUCOSE }{ { H }_{ 12 } } { O }_{ 6 }\quad +\quad 6{ O }_{ 2 }$
Plants are called autotrophs because they can prepare their own food by using light energy.
The process of photosynthesis is a reductive, endergonic, and anabolic process.
So, in photosynthesis light energy is converted into chemical energy as stated by ‘R.Mayer’.

Note: In photosynthesis, light is absorbed by the pigment chlorophyll which is present in chloroplast. Specifically, the chlorophyll molecule which absorbs light is Chl a.Resonance energy transfer is the phenomena by which electrons are transferred from light-harvesting complexes chlorophyll molecule to reaction-center chlorophyll molecule.