Which of the following processes involves the conversion of light energy into chemical energy?

$I.$ Photosystem-$I$ is a photosynthetic pigment system located on the appressed part of grana and thylakoids.
$II.$ Photosystem-$II$ is a photosynthetic pigment system located on the non-appressed part of stroma only.
Identify whether the given statements are correct or incorrect and choose the correct option accordingly.

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.

Choose the correct option from the following:
$(i)$ The light reactions of photosynthesis occur in the thylakoid / stroma of the chloroplast.
(ii) The membrane-less organelle is the lysosome / ribosome.

Most abundant protein of the biological world is

Chemosynthesis and photosynthesis are alike in that both