Question

What is palisade parenchyma?

Answer 1

Hint: It is a mesophyll tissue found in dorsiventral leaves. This layer consists of cylindrical / rectangular cells that are densely packed. It is positioned in the lower epidermis, behind the palisade parenchyma. Cells of spongy parenchyma are poorly organized; there are also many intercellular spaces between cells. Cells have a circular or irregular shape.

Complete Answer:
Parenchyma is a form of simple permanent tissue that makes up a large portion of plant ground tissues, where other tissues are embedded, such as vascular tissues. They are non-vascular and composed of cells that are simple, living and undifferentiated, modified to perform different functions.

Based on their form, location and roles carried out, parenchyma cells can be classified. The principal tissues of parenchyma are: parenchyma, chlorenchyma, aerenchyma, prosenchyma, epidermal parenchyma, xylem parenchyma, and mesophyll parenchyma.
- Palisade parenchyma and spongy parenchyma are included in mesophyll parenchyma.
- The upper ground tissue found in the leaves of the plant is Palisade parenchyma.
- It is found just bottom of the upper epidermis of the dorsiventral leaves.
- It consists of cells with columnar forms. Without intercellular spaces, the cells are closely packed.
- Chloroplasts are particularly common in the tissue of the palisade parenchyma. Therefore, the dark green colour of the palisade parenchyma tissue appears.
- Palisade parenchyma cells do not have a respiratory cavity.

Note: Palisade cells are plant cells located just under the epidermis and cuticles in leaves. They are vertically elongated, a shape distinct from the spongy mesophyll cells underneath them in the leaf. In plant stems, the lower and second ground tissue is spongy parenchyma.