Q. No.During secondary growth in the stem:-
1. The amount of secondary xylem produced is more than the secondary phloem as the
cambium is generally more active on the inner side than the outer.
2. the amount of secondary phloem produced is more than the secondary xylem as the cambium is generally more active on the inner side than the outer.
3. the amount of secondary xylem produced is more than the secondary phloem as the cambium is generally more active on the outer side than the inner.
4. the amount of secondary phloem produced is more than the secondary xylem as the cambium is generally more active on the outer side than the inner.
cambium is generally more active on the inner side than the outer.
In temperate region plants, the wood with fewer xylary elements and narrow vessels, is termed as:-
1. Spring wood
2. Autumn wood
3. Sap wood
4. Heart wood
The term 'bark' includes:
I. Phellogen
II. Phellem
III. Phelloderm
IV. Secondary phloem
1. I, II and III only
2. I, II and IV only
3. II, III and IV only
4. I, II, III and IV only
Identify the incorrect statement:
1. The presence of vessels is a characteristic of angiosperms
2. In roots the primary xylem is exarch
3. Gymnosperms lack albuminous cells and sieve cells
4. Bast fibers are generally absent in primary phloem
Parts of grasses removed by the grazing herbivores are regenerated due to the activity of:
1. Apical meristem
2. Intercalary meristem
3. Interfascicular cambium
4. Fascicular vascular cambium
The vascular bundle shown in the diagram is most likely to be seen in:
1. Monocot stem
2. Dicot stem
3. Monocot root
4. Dicot root
The main function of the plant tissue shown below is:
1. Storage of nutrients
2. Providing buoyancy to submerged plants
3. Mechanical support to growing parts of a plant
4. Increase in the length of the plant
Consider the following statements:
In a monocot stem-
| I: | Hypodermis is collenchymatous. |
| II: | Vascular bundle are collateral and closed. |
| III: | Trichomes are usually absent. |
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III
Consider the following statements about dicot leaf:
| I: | The epidermis which covers both the upper surface (adaxial epidermis) and lower surface (abaxial epidermis) of the leaf has a conspicuous cuticle. |
| II: | More stomata present on upper surface. |
| III: | Mesophyll is differentiated into palisade and spongy parenchyma. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
Consider the following statements:
With respect to secondary growth in dicot root-
| I: | The vascular cambium is completely secondary in origin. |
| II: | The primary phloem bundles are gradually crushed and not seen in older roots. |
| III: | Phellogen gives rise to secondary tissue on the outside and forms the phellem. |
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III
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