Name: Human Excretory System
Uploaded: 2019-07-19
Duration: 2 min 16 s
Description: This video briefly introduces the Human Excretory System and the organs associated with the same. It defines the excretion process and highlights kidneys, ureters, urinary bladder, and urethra.

Question

Describe an activity to show phloem transports food produced by leaves.

Accepted Answer

Aim: To show that phloem transports food prepared by the leaves.

Materials required: A potted plant and a razor blade.

Procedure: Take a potted plant with a thick stem. Carefully remove the bark of the stem with the help of a razor blade. This is known as girdling of the stem. The girdling of the stem removes the phloem tissues of the stem. Leave the plant in sunlight for a few days and observe the girdled part carefully.

The below diagram shows the experimental setup of the given activity:

Observation: The part of the stem above the girdle shows swelling, while the lower portion dries up.

Reason: Girdling of stem removes the phloem tissues of the stem. As a result, the food prepared by the leaves could not be translocated below the girdled part of the stem. Therefore, the food gets collected above the girdled part, resulting in swollen stem. The portion below the girdled stem dries up due to the lack of food.

Conclusion: Phloem transports the food prepared by the leaves to the different parts of the plant.

Describe an activity to show phloem transports food produced by leaves.

Important Questions on Transportation in Animals and Plants

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