Q. No.Which one of the following shows isogamy with non-flagellated gametes?
1. Sargassum
2. Ectocarpus
3. Ulothrix
4. Spirogyra
1. Sargassum
2. Ectocarpus
3. Ulothrix
4. Spirogyra
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An alga which can be employed as food for human beings :
1. Ulothrix
2. Chlorella
3. Spirogyra
4. Polysiphonia
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Which of the following is responsible for peat formation?
1. Marchantia
2. Riccia
3. Funaria
4. Sphagnum
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Male gametophyte with least number of cells is present in:
1. Pteris
2. Funaria
3. Lilium
4. Pinus
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Which one of the following statements is wrong?
1. Agar-agar is obtained from Gelidium and Gracilaria
2. Chlorella and Spirulina are used as space food
3. Mannitol is stored food in Rhodophyceae
4. Algin and carragen are products of algae
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Select the correct statement:
1. The leaves of gymnosperms are not well adapted to extremes of climate
2. Gymnosperms are both homosporous and heterosporous
3. Salvinia, Ginkgo and Pinus all are gymnosperms
4. Sequoia is one of the tallest trees
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In bryophytes and pteridophytes, transport of male gametes requires:
1. Water
2. Wind
3. Insects
4. Birds
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Conifers are adapted to tolerate extreme environmental conditions because of
| 1. presence of vessels | 2. broad hardy leaves |
| 3. superficial stomata | 4. thick cuticle |
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Which one of the following statements is wrong?
1. Laminaria and Sargassum are used as food.
2. Algae increase the level of dissolved oxygen in the immediate environment.
3. Algin is obtained from red algae, and carrageenan from brown algae.
4. Agar-agar is obtained from Gelidium and Gracilaria.
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