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प्रश्न
What are the components of the transport system in highly organised plants?
उत्तर १
In highly organised plants, there are two different types of conducting tissues – xylem and phloem. Xylem conducts water and minerals obtained from the soil (via roots) to the rest of the plant. Phloem transports food materials from the leaves to different parts of the plant body.
उत्तर २
- The upward movement of water and mineral salts from the roots to the aerial parts of the plant, such as leaves, shoots, and flowers, against gravity occurs through the process called the ascent of sap. In xylem tissue, the vessels and tracheids in the roots, stems, and leaves are connected to form a continuous system of water-conducting channels that extend to all parts of the plant.
- Water, along with dissolved minerals from the root hairs, moves into the xylem vessels through the cells of the cortex, endodermis, and pericycle. The ascent of sap then occurs from the xylem of the roots to the xylem of the stems and leaves via vessels and tracheids. The evaporation of water from the leaf cells, known as transpiration, creates a suction that pulls water upwards from the roots towards the upper parts of the plant.
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संबंधित प्रश्न
Water absorption through roots can be increased by keeping the plants ______.
Why is transport of materials necessary in a plant or in an animal? Explain.
Does transpiration serve any useful function in the plants? Explain.
What substance/substances are transported in plants by:
xylem vessels and tracheids?
What is the other name of main vein?
What is the need of special tissues or organs for transport of substances in plants and animals?
The process of carrying food from the leaves to other parts of a plant is called:
Crossword Puzzle
ACROSS
1. Special tubes through which food material is carried inside the plants body.
3. Channel through which movement of water and minerals occurs.
4. Red coloured fluid inside blood vessels.
5. Loss of water in vapour from the leaves.
9. Four chambered organ located in the chest cavity.
10. Blood vessels which bring blood into the heart. DOWN
2. Red coloured pigment which is a carrier of oxygen.
6. Blood vessels which carry blood from the heart.
7. Blood cells which help in clotting of blood.
8. Process by which water passes into the root hair.
Match the following.
| 1. Symplastic pathway | (a) Leaf |
| 2. Transpiration | (b) Plasmodesmata |
| 3. Osmosis | (c) Pressure in xylem |
| 4. Root Pressure | (d) Pressure gradient |
The phloem is responsible for the translocation of food.
How do plants absorb water? Explain.
When any dry plant material is kept in water, they swell up. Name and define the phenomenon involved in this change.
Assertion: Resins and gums are stored in old xylem tissue in plants.
Reason: Resins and gums facilitate transport of water molecules.
Why is transpiration important for plants?
How do leaves of plants help in excretion?
We need to water the soil in plants on a regular basis but it ultimately reaches the leaves of the plant. Explain how this takes place.
Match the pairs:
| Group ‘A’ | Group ‘B’ |
| (1) Parasitic plant | (a) Mushroom |
| (2) Insectivorous plant | (b) Lichen |
| (3) Saprophytic plant | (c) Drosera |
| (4) Symbiotic plant | (c) Drosera |
