Q. No.How many of the given features will be true for brown algae:
I. Presence of xanthophylls
II. A gelatinous coating of algin on cell wall
III. A centrally placed vacuole in plastids
IV. Ribbon shaped biflagellate zoospores
1.
1
2.
2
3.
3
4.
4
II. A gelatinous coating of algin on cell wall
III. A centrally placed vacuole in plastids
IV. Ribbon shaped biflagellate zoospores
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Artificial systems of classification give equal weightage to vegetative and sexual characteristics which is not acceptable because:
1. Only the sexually characters are genetically determined
2. Vegetative characters are more easily affected by environment
3. Sexual characters are not easily observable in living beings
4. Vegetative reproduction is equally common as sexual reproduction
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Which of the following is not an example of red algae?
1. Polysiphonia
2. Porphyra
3. Gracilaria
4. Laminaria
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What is the function of the gemmae produced by some liverworts?
1. a water gathering structure
2. a light gathering structure
3. a sexual structure
4. an asexual structure
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The life cycle of Ectocarpus, Polysiphonia and kelps is:
1.Diplontic
2.Haplontic
3.Aplantic
4.Haplo-diplontic
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Bryophytes are attached to the substratum by rhizoids that are:
| 1. | Unicellular | 2. | Multicellular |
| 3. | Acellular | 4. | Unicellular or multicellular |
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Sexual reproduction takes place through flagellated gametes that are similar in size in:
1. Ulothrix
2. Spirogyra
3. Volvox
4. Fucus
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Ecologically important first colonizers of rocks are:
| 1. | Lichens | 2. | Algae |
| 3. | Gymnosperms | 4. | Angiosperms |
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Which of the following classes of algae store food that is chemically very similar to amylopectin and glycogen?
| 1. | Chlorophyceae | 2. | Phaeophyceae |
| 3. | Rhodophyceae | 4. | All algae |
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The cell wall polysaccharides of some red algae are the source of:
1. a sugar substitute
2. a source of salt
3. glucose for the study of photosynthesis
4. agar for growing bacteria and other organisms
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