Q. No.Which of the following Greek root word means "naked" and hence gives name to plants like cycas and pines?
| 1. | angeion | 2. | sperm |
| 3. | gymnos | 4. | gynos |
Subtopic: Gymnosperms |
93%
From NCERT
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In gymnosperms, the ovules are:
| 1. | not enclosed by any ovary wall before and after fertilization |
| 2. | not enclosed by any ovary wall only before fertilization |
| 3. | not enclosed by any ovary wall only after fertilization |
| 4. | enclosed by an ovary wall before and after fertilization |
Subtopic: Gymnosperms |
87%
From NCERT
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The giant Redwood tree (Sequoia sempervirens) is a/an
| 1. | Angiosperm | 2. | Free fern |
| 3. | Pteridophyte | 4. | Gymnosperm |
Subtopic: Gymnosperms |
85%
From NCERT
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Coralloid roots in Cycas are associated with nitrogen fixing:
| 1. | Rhizobium | 2. | Frankia |
| 3. | Azospirillum | 4. | Cyanobacteria |
Subtopic: Gymnosperms |
84%
From NCERT
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All the following regarding Pinus are correct except:
1. Obligate association with mycorrhiza
2. Unbranched stems
3. Male and female strobili on the same plant
4. Leaves in fascicles
Subtopic: Gymnosperms |
74%
From NCERT
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Cycas does not have:
1. I and II only
2. I and IV only
3. II and IV only
4. I and III only
| I. | Coralloid roots |
| II. | Branched stems |
| III. | Pinnate persistent leaves |
| IV. | Male cones and megasporophylls borne on same plant |
2. I and IV only
3. II and IV only
4. I and III only
Subtopic: Gymnosperms |
79%
From NCERT
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Identify the incorrect statement:
| 1. | The gymnosperms are heterosporous. |
| 2. | Spores in gymnosperms are produced within sporangia. |
| 3. | Sporangia in gymnosperms are borne on sporophylls which are arranged spirally along an axis to form lax or compact strobili or cones. |
| 4. | Male strobili in gymnosperms are called macrosporangiate. |
Subtopic: Gymnosperms |
88%
From NCERT
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The terms that can be applied to all gymnosperms include:
| 1. | Naked seeds, Homosporous, Dominant independent sporophyte |
| 2. | Seeds enclosed in ovary wall, Heterosporous, Dominant independent sporophyte |
| 3. | Naked seeds, Heterosporous, Dominant independent sporophyte |
| 4. | Naked seeds, Heterosporous, Dominant independent gametophyte |
Subtopic: Gymnosperms |
61%
From NCERT
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Female sex organs of gymnosperms are called:
| 1. | Archegonia | 2. | Female strobili |
| 3. | Megasporangium | 4. | Megasporophyll |
Subtopic: Gymnosperms |
From NCERT
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Plants of this group are diploid and well adapted to extreme conditions. They grow bearing sporophylls in compact structures called cones. The group in reference is
| 1. | Monocots | 2. | Dicots |
| 3. | Pteridophytes | 4. | Gymnosperms |
Subtopic: Gymnosperms |
74%
From NCERT
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