Question

°External structure (part of a leaf in detail).​

Answer 1

Answer:

Structure Of A Leaf - Internal & External. Margin: This is the outer edging of the leaf. ... Lateral Veins: These veins are one of the most important parts of the leaf, they transport the food and water the leaf needs to all it's necessary places. Petiole: This part attaches the leaf to the actual plant stalk.

Explanation:

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Answer 2

Answer:

The external structure of a leaf consists of the below structures:

External structure of a leaf

Petiole:

Petiole is also known as leaf stalk

Petiole is the thin stalk that attaches the leaf to the main stem or branch

Lamina:  

Lamina is also known as leaf blade

It is the large broad green surface of the leaf

It gives a large surface for light absorption

Midrib:

Midrib is also known as main vein of the leaf

It is the large central thick vein of the leaf that runs through the leaf blade from its base to its apex.

Leaf margin:

Leaf margin is also known as leaf edges.

Leaf margins are thin which reduce the distance of diffusion of gases between the atmosphere and innermost leaf cells.

Leaf apex:  

Leaf apex is also known as leaf tip.

It is the terminal part of the leaf

Veins:

Leaf veins branch from the midrib of the leaf

Leaf veins contain vascular tissue of the leaf (xylem and phloem)

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