Question

Why hydathodes are also called as chalk glands?​

Answer 1

Answer:

• In ferns, guttation takes place through special openings called hydathodes.

• In ferns, water that exuded during guttation contains calcium salts.

• When exuded water evaporates off, a white crust remains on the surface.

• Hence, hydathodes are also called as 'chalk glands'.

Answer 2

Answer:

Hydathodes are responsible for secreting water and in the process of doing so, they also secrete a white coloured calcareous material dissolved in the water which gets deposited on the surface of the leaf and looks like chalk. Thus, hydathodes are also known as "chalk glands".

Explanation:

Hydathodes are small pores present on the surface of leaves of plants (majorly angiosperms) that secrete water from the interior of the leaf towards the exterior surface of the leaf by a process called guttation. This process is carried out to maintain balanced pressure inside the plant.