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Q. No.Heterospory in pteridophytes is an evolutionary advancement. Which statement regarding heterospory is INCORRECT?
1. Heterosporous pteridophytes produce two types of spores - microspores and megaspores
2. Selaginella and Salvinia are examples of heterosporous pteridophytes
3. Heterospory leads to development of separate male and female gametophytes
4. All pteridophytes including Lycopodium and Equisetum exhibit heterospory
1. Heterosporous pteridophytes produce two types of spores - microspores and megaspores
2. Selaginella and Salvinia are examples of heterosporous pteridophytes
3. Heterospory leads to development of separate male and female gametophytes
4. All pteridophytes including Lycopodium and Equisetum exhibit heterospory
Subtopic: Pteridophytes |
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Cycas and Pinus both belong to Gymnosperms but differ significantly. Which comparison is CORRECT?
1. Cycas ovules are borne on megasporophylls in compact cones; Pinus has loosely arranged megasporophylls
2. Cycas has unbranched stems with pinnate leaves; Pinus has branched stems with needle-like leaves in fascicles
3. Cycas has tap root system; Pinus has adventitious root system with coralloid roots
4. Cycas produces compact cones; Pinus produces loose palm-like leaves with circinate vernation
1. Cycas ovules are borne on megasporophylls in compact cones; Pinus has loosely arranged megasporophylls
2. Cycas has unbranched stems with pinnate leaves; Pinus has branched stems with needle-like leaves in fascicles
3. Cycas has tap root system; Pinus has adventitious root system with coralloid roots
4. Cycas produces compact cones; Pinus produces loose palm-like leaves with circinate vernation
Subtopic: Gymnosperms |
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Which of the following evolutionary transitions are correctly represented?
I. Transition from isogamy → anisogamy → oogamy in algae shows increasing sexual specialisation.
II. Development of heterospory in Selaginella marks beginning of precursor of seed habit.
III. Dependence on external water for fertilisation decreases from bryophytes → angiosperms.
IV. Sporophyte dominance decreases as we move from algae to angiosperms.
For the question posted above, select the correct option as your answer
1. I, II and III only
2. II and IV only
3. I and III only
4. I, II, III and IV
I. Transition from isogamy → anisogamy → oogamy in algae shows increasing sexual specialisation.
II. Development of heterospory in Selaginella marks beginning of precursor of seed habit.
III. Dependence on external water for fertilisation decreases from bryophytes → angiosperms.
IV. Sporophyte dominance decreases as we move from algae to angiosperms.
For the question posted above, select the correct option as your answer
1. I, II and III only
2. II and IV only
3. I and III only
4. I, II, III and IV
Subtopic: Algae |
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Algae are classified into different classes mainly on the basis of:
| 1. | Pigments, stored food, cell wall |
| 2. | Habitat, reproduction, size structure |
| 3. | Morphology, anatomy, life cycle |
| 4. | Nutrition, growth pattern, shape |
Subtopic: Algae |
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The plant body in bryophytes is:
| 1. | Sporophyte attached to gametophyte |
| 2. | Gametophyte which is dominant |
| 3. | Sporophyte which is independent |
| 4. | Gametophyte attached to sporophyte |
Subtopic: Bryophytes |
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Gymnosperms are characterised by:
| 1. | Naked seeds not enclosed in fruits |
| 2. | Covered seeds within ovary walls |
| 3. | Seeds developing into fruit structures |
| 4. | Spores produced in seed cones |
Subtopic: Gymnosperms |
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Bryophytes are restricted to moist habitats mainly because they:
| 1. | Their gametes require water for movement and fusion |
| 2. | Their sporophytes cannot survive under sunlight |
| 3. | Their leaves lack any pigment for photosynthesis |
| 4. | Their spores fail to germinate on dry substrates |
Subtopic: Bryophytes |
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Pteridophytes differ from bryophytes mainly in:
| 1. | Possessing gametophytes with vascular tissues |
| 2. | Appearing only in submerged aquatic habitats |
| 3. | Producing zygotes which disperse actively |
| 4. | Having a dominant sporophyte independent of gametophyte |
Subtopic: Pteridophytes |
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Gymnosperms survive well in extreme cold because they:
| 1. | Produce flowers that remain closed in winter |
| 2. | Possess needle-like leaves with thick cuticles |
| 3. | Show deciduous habit during cold season |
| 4. | Lack any significant vascular tissue differentiation |
Subtopic: Gymnosperms |
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The hallmark of angiosperms is the:
| 1. | Fusion of anther lobes to form a single sac |
| 2. | Lack of roots in early embryogenesis |
| 3. | Presence of double fertilisation producing endosperm |
| 4. | Absence of integuments around ovules |
Subtopic: Angiosperm |
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Level 1: 80%+
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