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A prokaryoticv autotrophic nitrogen-fixing symbiont is found in
Cycas
Cicer
Pisum
Alnus
A.
Cycas
The coralloid root of cycas is symbiotically associated with nitrogen fixing blue -green algae, Anabaena Cycadae and Nostoc punctiforme. These blue-green algae (Cyanobacteria) are prokaryotic, photosynthetic and autotrophic.
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An alga which can be employed as food for human being is
Ulothrix
Chlorella
Spirogyra
Polysiphonia
B.
Chlorella
Chlorella is an attractive potential food source new-a -days: because it is high in protein and other essential nutrients. When dried, it contains about 45% protein, 20% fat, 20% carbohydrates 5% fibre and 10% minerals along with vitamins. It mainly used as a food supplement for astronauts.
Examine the figure A, B, C, and D. In which one of the four options, all the items A, B, C and D are correct.
|
A |
B |
C |
D |
|
Chara |
Marchantia |
Fucus |
Pinus |
|
A |
B |
C |
D |
|
Equisetum |
Ginkgo |
Selaginella |
Lycopodium |
|
A |
B |
C |
D |
|
Selaginella |
Equisetum |
Salvinia |
Ginkgo |
|
A |
B |
C |
D |
|
Funaria |
Adiantum |
Salvinia |
Riccia |
C.
|
A |
B |
C |
D |
|
Selaginella |
Equisetum |
Salvinia |
Ginkgo |
A -Selaginella
B- Equisetum
C- Salvinia
D- Ginkgo
Flagellated male gametes are present in all the three of which one of the following sets?
Anthoceros, Funaria and Spirogyra
Zygnema, Saprolegnia and Hydrilla
Fucus, Marsilea and Calotropis
Riccia, Dryopteris and Cycas
D.
Riccia, Dryopteris and Cycas
Flagellated male gametes are present in Riccia, Dryopteris and Cycas.
Gymnosperms are also called soft wood spermatophytes because they lack
cambium
phloem fibres
thick-walled tracheids
xylem fibres
D.
xylem fibres
Gymnosperms lack xylem fibres. Large amount of parenchymatous cells are present with secondary xylem tracheids. So, these are also known as softwood spermatophytes.
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