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प्रश्न
What are tracheary elements? Describe their functions.
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उत्तर
Tracheary elements are the elongated cells of xylem tissue. They are of two types:
(i) Vessels: These are long tube-like structures that are formed by a row of cells placed end to end. The transverse walls between the vessel elements are completely dissolved forming water pipes.
(ii) Tracheids: These are elongated cells with tapering ends. Since their end walls have closed ends, water has to pass from cell to cell via pits.
Both these elements are involved in the conduction of water.
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संबंधित प्रश्न
How many types of elements together make up the xylem tissue? Name them.
What are the functions of the stomata?
Draw a well labelled diagram of parenchyma and collenchyma.
Distinguish between xylem and phloem.
What is simple tissue? Classify and explain its different types with suitable diagram.
What do you know about complex tissue? Classify and explain its different types in plants with suitable diagrams.
Study the diagram given below and then answer the question that follows:
Name the parts labelled 1, 2, 3 and 4.
Name the tissue associated with the following:
Movement of food in the plant body
Match the column (A) with the column (B)
| (A) | (B) | ||
| (a) | Parenchyma | (i) | Thin walled, packing cells |
| (b) | Photosynthesis | (ii) | Carbon fixation |
| (c) | Aerenchyma | (iii) | Localized thickenings |
| (d) | Collenchyma | (iv) | Buoyancy |
| (e) | Permanent tissue | (v) | Sclerenchyma |
Match the followings and choose the correct option from below
| Column I | Column II |
| A. Meristem | i. Photosynthesis, storage |
| B. Parenchyma | ii. Mechanical support |
| C. Collenchyma | iii. Actively dividing cells |
| D. Sclerenchyma | iv. Stomata |
| E. Epidermal tissue | v. Sclereids |
