Q. No.Gymnosperms are also called soft wood spermatophytes because they lack :
1. Cambium
2. Phloem fibres
3. Thick-walled tracheids
4. Xylem fibres
1. Cambium
2. Phloem fibres
3. Thick-walled tracheids
4. Xylem fibres
Which one of the following is a correct statement?
1. Pteridophyte gametophyte has a protonemal and leafy stage
2. In gymnosperms, female gametophyte is free-living
3. Antheridiophores and archegoniophores are present in pteridophytes
4. Origin of seed habit can be traced in pteridophytes
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Isogamous condition with non-flagellated gametes is found in:
1. Spirogyra
2. Volvox
3. Fucus
4. Chlamydomonas
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Read the following statements (A-E) and answer the question which follows them.
(A) In liverworts, mosses, and ferns gametophytes are free-living
(B) Gymnosperms and some ferns are heterosporous
(C) Sexual reproduction in Fucus, Volvox and Albugo is oogamous
(D) The sporophyte in liverworts is more elaborate than that in mosses
(E) Both, Pinus and Marchantia, are dioecious
How many of the above statements are correct?
| 1. Two | 2. Three |
| 3. Four | 4. One |
Which one of the following shows isogamy with non-flagellated gametes?
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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