Question

The thin, green, broad part of the leaf is called ___.

• A. leaf base
• B. lamina
• C. midrib
• D. petiole

Answer 1

The correct option is B

lamina

The correct option is (B):

Explanation of the correct option:

1. The broad flattened green part of the leaf containing the green pigment called chlorophyll is called the lamina.
2. Lamina contains the photosynthetic pigment called chlorophyll which can trap the solar energy to produce food (glucose) and oxygen.
3. There are minute pores inside the lamina called the stomata which helps with removal of excess water in the form of water vapor during transpiration.

Explanation of the incorrect options:

Option (A):

The leaf base is the swollen part of the petiole where it connects with the node of the stem.

Option (C):

1. The central thick vein present in the leaf lamina which extends from the petiole to the leaf apex is called the midrib.
2. Midrib contains the conducting tissues called xylem and phloem and the veins originate from it.
3. The midrib and its veins facilitate the transport of food, water and minerals.

Option (D):

1. Petiole is the stalk-like structure that connects the lamina of the leaf with the node of the stem.
2. It holds the leaf with the stem and facilitates the rotation of the leaf towards sunlight.

Final Answer: The thin, green, broad part of the leaf is called lamina.