Plastids are organelles found in the cells of plants and algae. They are responsible for various functions such as photosynthesis, storage of food, and pigmentation. However, not all plant cells contain plastids. Let's understand which type of plant cell does not have plastids.

Sclerenchyma Cells

Sclerenchyma cells are a type of plant cell that provides mechanical support to the plant. They have a thick, lignified secondary cell wall that makes them rigid and inflexible. These cells are found in stems, roots, and leaves of the plant.

Plastids Absent in Sclerenchyma Cells

Plastids are absent in sclerenchyma cells. Since these cells do not have chloroplasts, they cannot perform photosynthesis. Instead, they function in providing mechanical support to the plant. Therefore, option B is the correct answer - plastids are absent in sclerenchyma cells.

Other Plant Cell Types

Parenchyma and collenchyma cells are two other types of plant cells. Parenchyma cells are the most common type of plant cell and are responsible for functions such as photosynthesis, storage of food, and gas exchange. They contain plastids, including chloroplasts. Collenchyma cells are also involved in providing mechanical support to the plant; however, they are more flexible than sclerenchyma cells. They also have plastids, although they are not involved in photosynthesis.

Conclusion

Plastids are organelles found in plant and algae cells that are involved in various functions. Sclerenchyma cells, which provide mechanical support to the plant, do not contain plastids. Parenchyma and collenchyma cells are two other types of plant cells that contain plastids.