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प्रश्न
Girth of a maize plant does not increase over a period of time. Justify.
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उत्तर
- Maize plant belongs to class monocotyledonae.
- In monocotyledonous plants, vascular bundles are closed type.
- Thus, cambium is absent between xylem and phloem, due to which secondary growth does not occur in these plants.
- Increase in girth of a stem occurs by secondary growth. Thus, the girth of a maize plant does not increase over a period of time.
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संबंधित प्रश्न
Complete the following table.
| Groups of algae | Chlorophyceae | Phaeophyceae | Rhodophyceae |
| 1. Stored food | Starch | ||
| 2. Cell Wall | Cellulose and algin | ||
| 3. Major pigments | Chl- a, d and Phycoerythrin |
Differentiate between Dicotyledonae and Monocotyledonae based on the following characters:
- Type of roots
- Venation in the leaves
- Symmetry of flower
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We observe that land becomes barren soon after monsoon. But in the next monsoon it flourishes again with varieties we observed in season earlier. How you think it takes place?
Fern is a vascular plant. Yet it is not considered a Phanerogams. Why?
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Chlamydomonas is microscopic whereas Sargassum is macroscopic; both are algae. Which characters of these plants includes them in one group?
Draw a neat labelled diagram.
Spirogyra
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Identify the plant group on the basis of the following feature:
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Plant body undifferentiated into root, stem, and leaves
