Which of the following photosynthetic bacteria have both $PS-I$ and $PS-II$?

$I.$ In $C_{3}$-plants,the Calvin pathway takes place in mesophyll cells.
$II.$ In $C_{4}$-plants,the Calvin pathway takes place in the mesophyll cells.
Which of the following statements is true?

Which type of phosphorylation takes place in photosynthesis?

Choose the incorrect sentences for chloroplast.
$(1)$ The chloroplast membranous system consists of grana and the fluid stroma.
$(2)$ Pigments are present in the stroma.
$(3)$ In the stroma,enzymatic reactions incorporate $CO_2$ into the plant,leading to the synthesis of sugar.
$(4)$ Light is not required for the formation of sugar in the stroma.

The green part of the plant is primarily involved in which of the following processes?

Which of the following is true for photosynthesis?