Transport System in Plants

Plants have a transport system that helps move essential substances throughout the plant. This system is made up of two main parts.

1. Xylem: The xylem transports water and minerals from the roots to all parts of the plant, especially the leaves and other aerial parts. This helps the plant stay hydrated and nourished.

2. Phloem: The phloem transports food, such as glucose (made in the leaves during photosynthesis), to other parts of the plant where it is used or stored. The food moves from the leaves to places like the roots, stems, and fruits.

• Although plants have a transport system, they do not have separate systems for digestion or excretion like animals. Instead, they produce their food through photosynthesis, which makes carbohydrates using carbon, hydrogen, and oxygen.
• Plants also need proteins made from carbon, hydrogen, oxygen, and nitrogen. While air contains nitrogen, plants cannot use it directly. This nitrogen must be "fixed" or converted into a form that plants can absorb.
• Nitrogen fixation happens naturally through biological processes (by bacteria) or atmospheric methods (like lightning). This is how plants get the nitrogen they need to grow and stay healthy.

Transport system in plants

1. Aim: To observe how water moves through the stem and leaves of a plant using a coloured solution.

2. Requirements: A pumpkin stem with 2-3 leaves, a sharp blade, a conical flask, water and 7-8 drops of ink (or food colouring).

3. Procedure

• Cut the pumpkin stem underwater using a sharp blade to avoid air bubbles entering the stem.
• Fill a conical flask with water and add 7-8 drops of ink or food colouring to it.
• Place the cut pumpkin stem vertically into the flask, ensuring that the cut end is submerged in the coloured water.
• Leave the setup for several hours and observe the changes in the stem and leaves.

4. Conclusion: After some time, the coloured water will move up the stem and can be seen in the leaves. This demonstrates the process of water transport in plants, where water and nutrients travel from the roots to the leaves through the xylem. The ink helps make this movement visible, showing how plants absorb and transport water.