Question

Answer in one word:

Thick vein in the middle of the lamina.

Answer 1

Lamina:

1. The broad flat part of the leaf containing the green pigment called chlorophyll is called the lamina.
2. The thick veins present in the middle of the lamina extends from the petiole to the leaf apex and is called the midrib.
3. Midvein or midrib branches further to produce veins on the lamina and they contain conducting tissues for transporting food, water and minerals.

Final Answer: Thick vein in the middle of the lamina is the midrib.