Photosynthesis occurs in
(a)Leaves
(b)Leaf cells
(c)Plants
(d)Chloroplasts

Hint: Photosynthesis is a vital process for almost all organisms on earth except the chemosynthetic bacteria. Along with plants, algae and cyanobacteria can carry out Photosynthesis.

Complete answer:
Photosynthesis occurs in the leaves of the green plants with the help of the green pigments named chlorophyll. In the presence of these pigments, the leaves take up sunlight and carbon dioxide from the atmosphere. In the reaction between the carbon dioxide and water taken from the soil by the roots, the end product gives sugar and oxygen that are essential for the survival of other organisms.


Additional Information: In this process, the sunlight energy absorbed by the leaves with the help of chlorophyll transforms into chemical energy. This reaction is the life energy of all the other organisms living on earth as most of them depend on plants for food and oxygen released by the plants is vital for all living organisms. Without this process, the only organisms that can live are chemosynthetic bacteria.
In plants, the chlorophyll pigments are present in the chloroplast cells which are found mainly in the green leaves of the plants. The photosynthetic process includes two reactions- light and dark. The light reaction occurs in presence of sunlight to produce ATP. This process occurs in steps like absorption of light, splitting of water, the release of oxygen, and the formation of ATP and NADPH. On the other hand, the dark or light-independent reaction occurs in the stroma of chloroplasts, and two cycles named Calvin and ${ C }_{ 4 }$ are involved in this.
So, the correct answer is ‘Leaves’.

Note: Here, all answers are more or less correct. Photosynthesis occurs in the leaf cells of green plants hence both leaves and leaf cells are the correct answer. Plants are the most common organisms to carry out this process, especially green ones. The dark or light-independent reactions of photosynthesis occur in the stroma of the Chloroplast cells of green plants where chlorophyll is found.