Write a short note on mesophyll.

Explanation

The tissue present between the upper and lower epidermis is called mesophyll. It is differentiated into:
(a) Palisade Parenchyma: It is found just below the upper epidermis. The cells are elongated.
These cells have more number of chloroplasts. The cells do not have intercellular spaces and they take part in photosynthesis.
(b) Spongy Parenchyma: It is found below the palisade parenchyma tissue. Cells are almost spherical or oval and are irregularly arranged. Cells have intercellular spaces. It helps in gaseous exchange.