In bacterial photosynthesis,which of the following is present?

$I.$ 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.

The most vital process for the existence of life on earth is

$CO_2$ is formed in all of the following except:

Under conditions of constant illumination,the compensation period for a whole aquarium would be of infinite length when:

Match the following.

Column-$I$	Column-$II$
$(p)$ Grana region of chloroplast	$(i)$ Krebs cycle
$(q)$ Stroma region of chloroplast	$(ii)$ Light reaction
$(r)$ Cytoplasm	$(iii)$ Dark reaction
$(s)$ Matrix of mitochondria	$(iv)$ Glycolysis