Question

Hydathodes are present :

• A. on the upper surface of the leaf.
• B. on the lower surface of the leaf.
• C. at the tip of the veins of the leaf.
• D. at the base of the veins of the leaf.

Answer 1

The correct option is C

at the tip of the veins of the leaf.

The correct option is C.

Explanation for the correct option

1. Hydathodes are small water pores located in the leaves of plants.
2. These pores are involved in the loss of water from the plant body in the form of water droplets.
3. The major driving force for water loss from hydrophones is root pressure.
4. The water droplets are formed at the margin of a leaf. This means hydathodes are located at the tip of veins of the leaf, marginally.

Explanation for incorrect options

Option A:

1. The upper side of the leaf is also called the ventral side.
2. There are few stomata, and no hydathodes are found on the upper side of the leaf.

Option B:

1. The lower side of the leaf is called the dorsal side.
2. There are many stomata, and no hydathodes are found on the upper side of the leaf.

Option D:

1. Veins supply nutrients to the parts of a leaf.
2. The base of veins connects the midrib and has no hydathodes.

Hydathodes are found at the tip of the leaf.