Q. No.A species of red algae has been discovered near Bahamas at a depth of more than 260 m. This unusual feat is possible because this alga:
1.
lacks pigmentation and functions heterotrophically as parasite on other plants
2.
has significant amount of phycoerythrin in addition to chlorophyll a and d
3.
unlike other red algae has flagellated gametes
4.
it has large number of root like rhizoids enabling it to attach to a deep substratum
The earliest land plants lacked true roots. What may have enabled them the most to colonize land?
| 1. | Symbiotic associations with fungi |
| 2. | Prostrate thalloid body |
| 3. | Motile antherozoids capable of reaching the egg through water |
| 4. | Parasitic and saprophytic modes of nutrition |
Charophytes are the only living algae that share distinctive derived traits with land plants that other algae don’t. All the following will be examples of such derived traits except:
1. Rings of cellulose-synthesizing proteins
2. Structure of flagellated sperms
3. Formation of a phragmoplast
4. Presence of chlorophyll a and b
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Seed plants are source of some very important medicines for humans. Identify the pair where the drug in Column I is not correctly matched with its source seed plant in Column II:
|
|
COLUMN I |
COLUMN II |
|
1. |
Digitalin |
Foxglove |
|
2. |
Quinine |
Cinchona |
|
3. |
Taxol |
Belladonna plant |
|
4. |
Vinblastine |
Periwinkle |
In the given diagram of the green alga Chara, the parts labeled A and B respectively are called :
1. Nucule and Globule
2. Globule and Nucule
3. Antheridium and Archegonium
4. Archegonium and Antheridium
In the life cycle of a moss, the sporphytic generation is represented by all the following except:
| 1. | Oospore | 2. | Spore |
| 3. | Sporogonium | 4. | Spore mother cell |
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Identify the incorrectly matched row:
|
|
Character |
Gymnosperm |
Angiosperm |
|
1. |
Xylem |
Tracheids only |
Mainly vessels |
|
2. |
Pollination agency |
Water only |
Various |
|
3. |
Female gametophyte |
Relatively large with distinct Archegonia |
8-nucleate embryo sac |
|
4. |
Endosperm |
Haploid |
Triploid |
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The structure in phanerogams that is homologous to the megasporangium of cryptogams is known as:
1. Embryo sac
2. Pollen sac
3. Nucellus of the ovule
4. Carpel
Sphagnum can be distinguished from mosses by all the following characteristics except:
1. The stem has no rhizoids
2. Leaves have green and hyaline cells
3. The sex organs do not limit the indefinite growth of the main axis
4. The capsule is borne on seta
Aplanogametes [gametes that do not have flagella] are the special features of:
1. Spirogyra and Zygnema
2. Spirogyra and Vaucheria
3. Ulothrix and Zygnema
4. Chlamydomanas and Ulothrix
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