The plastids are found in meristematic tissues specially inside parenchyma cells of the plant.

The correct answer is option 'D' - Mesophyll.

Mesophyll is the tissue in a leaf where plastids are present. Let's understand this in detail:

Leaf Structure:
A leaf is a flattened organ that is attached to the stem of a plant. It is the primary site for photosynthesis, where the plant synthesizes food using sunlight, water, and carbon dioxide. The leaf structure consists of different layers and tissues that perform specific functions.

Mesophyll Tissue:
The mesophyll is the inner tissue of a leaf, located between the upper and lower epidermis. It is responsible for carrying out photosynthesis. The mesophyll tissue contains specialized cells called mesophyll cells, which are packed with chloroplasts.

Chloroplasts and Plastids:
Plastids are specialized organelles found in the cells of plants and algae. They are responsible for various functions, including photosynthesis, storage of pigments, and synthesis of essential molecules. Chloroplasts are a type of plastid that contain chlorophyll, a green pigment required for photosynthesis.

Presence of Plastids in Mesophyll Tissue:
The mesophyll tissue is specifically adapted for photosynthesis, and it contains a high concentration of chloroplasts. These chloroplasts are responsible for capturing sunlight and converting it into chemical energy through the process of photosynthesis. The green color of the mesophyll tissue is due to the abundance of chlorophyll pigments in the chloroplasts.

Function of Mesophyll Tissue:
The mesophyll tissue plays a crucial role in photosynthesis. It absorbs light energy and converts it into chemical energy to produce glucose, which serves as a source of energy for the plant. The mesophyll cells are arranged in a dense layer to maximize light absorption and facilitate efficient photosynthesis.

Conclusion:
In conclusion, plastids, specifically chloroplasts, are present in the mesophyll tissue of a leaf. The mesophyll tissue is responsible for carrying out photosynthesis and contains a high concentration of chloroplasts, which are essential for capturing sunlight and converting it into chemical energy.

Ya answer is D