Q. No.Which of the following is not true for the green alga Spirogyra?
1. Unbranched, filamentous and commonly found in stagnant fresh water bodies.
2. The filament is composed of large number of long, cylindrical cells placed one above the other in a single row.
3. The cells are characterised by long spiral ribbon-shaped chloroplasts with several pyrenoids.
4. There are multiple small vacuoles in each cell.
1. Unbranched, filamentous and commonly found in stagnant fresh water bodies.
2. The filament is composed of large number of long, cylindrical cells placed one above the other in a single row.
3. The cells are characterised by long spiral ribbon-shaped chloroplasts with several pyrenoids.
4. There are multiple small vacuoles in each cell.
An important feature of bryophytes is that the embryonic development of the zygote takes place in the:
| 1. Sporangium | 2. Archegonium |
| 3. Protonema | 4. Antheridium |
In contrast to conifers, gnetophytes produce:
1. Simple pollen strobili and simple seed strobili
2. Simple pollen strobili and compound seed strobili
3. Compound pollen strobili and simple seed strobili
4. Compound pollen strobili and compound seed strobili
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
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
Identify the incorrect statement regarding gymnosperms in general:
1. They are heterosporous
2. Megaspore mother cell is differentiated from a cell in the nucellus
3. Multicellular female gametophyte is retained on the megasporangium
4. The male gametophyte has a large number of cells
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Consider the following two statements:
I. In Selaginella and Salvia, development of zygotes into young embryos takes place within the female gametophyte.
II. Selaginella and Salvia are homosporous pteridophytes
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is true but II is false
4. I is false but II is true
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Gracilaria and Gelidium, that are source of Agar, belong to:
| 1. | Chlorophyceae | 2. | Rhodophyceae |
| 3. | Phaeophyceae | 4. | Fungi |
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Prothallus is a:
| 1. | Multicellular, free-living, mostly photosynthetic thalloid gametophyte in pteridophytes |
| 2. | Multicellular, free-living, mostly photosynthetic thalloid sporophyte in pteridophytes |
| 3. | Multicellular, free-living, non photosynthetic thalloid gametophyte in pteridophytes |
| 4. | Multicellular, free-living, mostly photosynthetic well differentiated sporophyte in pteridophytes |
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Identify the incorrect statement regarding red algae:
1. Major pigments are chlorophyll a, c and phycocyanin
2. Stored food is floridean starch
3. Cellulosic cell wall with pectin and polysulfate esters
4. Absent flagellar insertions
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