Explain an activity to show that stem conducts water and other substances.

Hint: The transportation of water and salts in the upward direction via xylem and food in an upward and downward direction via the phloem, this process is known as conduction. Conduction of water and nutrient minerals occurs by stem from their site of absorption in the roots to the leaves by vascular tissues present in the xylem. The measure of the capability of water to pass electrical flow is known as the conductivity of water.

Complete answer:
An activity to show that stem conducts water and other substances is given below:
1) Take a glass and put some water in it.
2) Put a few drops of red ink in the water.
3) Cut the stem from the base of an herb plant.
4) Place the stem in the glass.
5) Results are observed, some parts of the stem become red and they indicate that water is being conducted through the stem.

Additional Information: A stem is a part that connects the roots to the leaves, stores food, provides support, and holds the flowers, leaves, and buds.
It conducts water and other substances to the leaves, which are further converted into useful products by the process of photosynthesis. Then, these products are transported from the leaves to other plant parts including roots.
A transport system throughout the plant body is formed by the vascular bundles in roots, stem, and leave veins that form a continuous system of tubes.
The plants that store water in the stems are succulent. Such as Cactus.

Note: The transportation of water and salts in the upward direction via xylem and food in an upward and downward direction via the phloem, this process is known as conduction. A transport system throughout the plant body is formed by the vascular bundles in roots, stem, and leave veins which form a continuous system of tubes. It conducts water and other substances to the leaves, which are further converted into useful products by the process of photosynthesis. Then, these products are transferred from the leaves to other plant parts including roots.