Question

Here is a picture of a leaf.

Study the picture and label the different parts in the blank lines drawn as 1, 2, 3, and 4.

1. _____________
2. _____________
3. _____________
4. _____________

Answer 1

Petiole

1. Leaf arises from the node of a stem and is attached to the stem with a stalk known as a petiole.
2. The petiole is the stalk that supports a leaf in a plant and attaches the leaf blade to the stem.

Leaf-blade or Lamina

1. Leaves are subdivided into different parts and structures including, veins and lamina.
2. The flat green part of a leaf is called a leaf blade or lamina.
3. Midrib, veins are arranged on the flat green lamina part of the leaf.

Midrib

1. The midrib is the thick central vein that runs along the centre of the lamina.
2. Midrib supports the leaf and helps the leaf to maintain an upright position
3. Midrib also contains xylem and phloem for the transport of water, food, and nutrients.

Veins

1. Small fine lines present on the leaf blade or lamina, are called its vein.
2. A leaf has numerous amount of veins throughout its structure for the transportation of water into the leaf and transportation of sugars from the leaf to the rest of the plant.

Final answer:

1. Petiole
2. Lamina
3. Midrib
4. Veins