Question

15.State the functions of the following:
a) Petiole
b) Veins of the leaf
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Answer 1

petiole - In botany, the petiole is the stalk that attaches the leaf blade to the stem, and is able to twist the leaf to face the sun. This gives a characteristic foliage arrangement to the plant. Outgrowths appearing on each side of the petiole in some species are called stipules.

Veins of the leaf - Veins are composed of xylem and phloem cells embedded in parenchyma, sometimes sclerenchyma, and surrounded by bundle sheath cells. The vein xylem transports water from the petiole throughout the lamina mesophyll, and the phloem transports sugars out of the leaf to the rest of the plant.

Answer 2

Answer:

a) The petiole is the pipeline through which the products of photosynthesis are moved from individual leaves to the rest of a plant. During this process, necessary chemicals and nutrients from other parts of the plant (such as nutrients absorbed through the roots) are transported to individual leaves.

b) vein (vascular bundle) - Veins provide support for the leaf and transport both water and minerals (via xylem) and food energy (via phloem) through the leaf and on to the rest of the plant.

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