259454
Azolla is used as a biofertilizer because it
1 multiplies very fast to produce massive biomass
2 has association of nitrogen-fixing Rhizobium
3 has association of nitrogen - fixing cyanobacteria
4 has association of mycorrhiza
Explanation:
Biofertilizers are microbe-containing compounds that help to promote plant and tree growth by increasing the supply of vital nutrients to plants. The main sources of biofertilizers are bacteria, fungi and cyanobacteria. Azolla is water fern which is also used as a biofertilizer. Symbiotic cyanobacteria Anabaena azollae is responsible for nitrogen-fixation which increases the fertility of the soil and in turn enhances the yield. Azolla pinnata, is used as an excellent fertilizer in rice field.
Rajasthan PMT-2010
Plant kingdom
259455
Which of these does not show heterospory?
1 Pinus
2 Selaginella
3 Dryopteris and moss
4 sunflower
Explanation:
The Dryopteris and Moss form monoecious gametophytes as all spores are uniform. The heterospory is the production of two different types of spores by the sporophytes of land plants. They are mostly found in some pteridophytes and all seed plants, i.e. Gymnosperms and Angiosperms, whereas the Bryophytes are not heterosporous.
AMU-2011
Plant kingdom
259456
The present day higher green plants are believed to have evolved from
1 ferns
2 green algae
3 liverworts
4 mosses
Explanation:
The present day higher green plants are believed to have evolved from ferns. They are believed to be originated during the late Palaeozoic era (about 250 million years ago).
AMU-1999
Plant kingdom
259457
Telome theory of Zimmerman (1930) applies only to:
1 bryophytes
2 pteridophytes
3 tracheophytes
4 all plants
Explanation:
The 'Telome theory' was proposed by Zimmerman (1930), he explained the origin of the megaphyll as well as of reproductive branches in vascular plants i.e. pteridophytes. The complex structures such as leaves (megaphylls) roots, reproductive organs, and other vascular plants evolved by the modification of terminal branches (telomes) of stems.
VMMC-2006
Plant kingdom
259458
Seed habit is developed first time in :
1 some ferns
2 some pinus
3 some monocots
4 some dicots
Explanation:
Seed habit was developed first time in some ferns. It is one of the most important aspects of evolution of land plants. The origin and evolution of seed habit started in late Devonian times. The earlier seed plants or plants with seed-like structures were found to have existed in the Devonian seed ferns Lyginopteris, an archetypal Pteridosperm.
259454
Azolla is used as a biofertilizer because it
1 multiplies very fast to produce massive biomass
2 has association of nitrogen-fixing Rhizobium
3 has association of nitrogen - fixing cyanobacteria
4 has association of mycorrhiza
Explanation:
Biofertilizers are microbe-containing compounds that help to promote plant and tree growth by increasing the supply of vital nutrients to plants. The main sources of biofertilizers are bacteria, fungi and cyanobacteria. Azolla is water fern which is also used as a biofertilizer. Symbiotic cyanobacteria Anabaena azollae is responsible for nitrogen-fixation which increases the fertility of the soil and in turn enhances the yield. Azolla pinnata, is used as an excellent fertilizer in rice field.
Rajasthan PMT-2010
Plant kingdom
259455
Which of these does not show heterospory?
1 Pinus
2 Selaginella
3 Dryopteris and moss
4 sunflower
Explanation:
The Dryopteris and Moss form monoecious gametophytes as all spores are uniform. The heterospory is the production of two different types of spores by the sporophytes of land plants. They are mostly found in some pteridophytes and all seed plants, i.e. Gymnosperms and Angiosperms, whereas the Bryophytes are not heterosporous.
AMU-2011
Plant kingdom
259456
The present day higher green plants are believed to have evolved from
1 ferns
2 green algae
3 liverworts
4 mosses
Explanation:
The present day higher green plants are believed to have evolved from ferns. They are believed to be originated during the late Palaeozoic era (about 250 million years ago).
AMU-1999
Plant kingdom
259457
Telome theory of Zimmerman (1930) applies only to:
1 bryophytes
2 pteridophytes
3 tracheophytes
4 all plants
Explanation:
The 'Telome theory' was proposed by Zimmerman (1930), he explained the origin of the megaphyll as well as of reproductive branches in vascular plants i.e. pteridophytes. The complex structures such as leaves (megaphylls) roots, reproductive organs, and other vascular plants evolved by the modification of terminal branches (telomes) of stems.
VMMC-2006
Plant kingdom
259458
Seed habit is developed first time in :
1 some ferns
2 some pinus
3 some monocots
4 some dicots
Explanation:
Seed habit was developed first time in some ferns. It is one of the most important aspects of evolution of land plants. The origin and evolution of seed habit started in late Devonian times. The earlier seed plants or plants with seed-like structures were found to have existed in the Devonian seed ferns Lyginopteris, an archetypal Pteridosperm.
259454
Azolla is used as a biofertilizer because it
1 multiplies very fast to produce massive biomass
2 has association of nitrogen-fixing Rhizobium
3 has association of nitrogen - fixing cyanobacteria
4 has association of mycorrhiza
Explanation:
Biofertilizers are microbe-containing compounds that help to promote plant and tree growth by increasing the supply of vital nutrients to plants. The main sources of biofertilizers are bacteria, fungi and cyanobacteria. Azolla is water fern which is also used as a biofertilizer. Symbiotic cyanobacteria Anabaena azollae is responsible for nitrogen-fixation which increases the fertility of the soil and in turn enhances the yield. Azolla pinnata, is used as an excellent fertilizer in rice field.
Rajasthan PMT-2010
Plant kingdom
259455
Which of these does not show heterospory?
1 Pinus
2 Selaginella
3 Dryopteris and moss
4 sunflower
Explanation:
The Dryopteris and Moss form monoecious gametophytes as all spores are uniform. The heterospory is the production of two different types of spores by the sporophytes of land plants. They are mostly found in some pteridophytes and all seed plants, i.e. Gymnosperms and Angiosperms, whereas the Bryophytes are not heterosporous.
AMU-2011
Plant kingdom
259456
The present day higher green plants are believed to have evolved from
1 ferns
2 green algae
3 liverworts
4 mosses
Explanation:
The present day higher green plants are believed to have evolved from ferns. They are believed to be originated during the late Palaeozoic era (about 250 million years ago).
AMU-1999
Plant kingdom
259457
Telome theory of Zimmerman (1930) applies only to:
1 bryophytes
2 pteridophytes
3 tracheophytes
4 all plants
Explanation:
The 'Telome theory' was proposed by Zimmerman (1930), he explained the origin of the megaphyll as well as of reproductive branches in vascular plants i.e. pteridophytes. The complex structures such as leaves (megaphylls) roots, reproductive organs, and other vascular plants evolved by the modification of terminal branches (telomes) of stems.
VMMC-2006
Plant kingdom
259458
Seed habit is developed first time in :
1 some ferns
2 some pinus
3 some monocots
4 some dicots
Explanation:
Seed habit was developed first time in some ferns. It is one of the most important aspects of evolution of land plants. The origin and evolution of seed habit started in late Devonian times. The earlier seed plants or plants with seed-like structures were found to have existed in the Devonian seed ferns Lyginopteris, an archetypal Pteridosperm.
259454
Azolla is used as a biofertilizer because it
1 multiplies very fast to produce massive biomass
2 has association of nitrogen-fixing Rhizobium
3 has association of nitrogen - fixing cyanobacteria
4 has association of mycorrhiza
Explanation:
Biofertilizers are microbe-containing compounds that help to promote plant and tree growth by increasing the supply of vital nutrients to plants. The main sources of biofertilizers are bacteria, fungi and cyanobacteria. Azolla is water fern which is also used as a biofertilizer. Symbiotic cyanobacteria Anabaena azollae is responsible for nitrogen-fixation which increases the fertility of the soil and in turn enhances the yield. Azolla pinnata, is used as an excellent fertilizer in rice field.
Rajasthan PMT-2010
Plant kingdom
259455
Which of these does not show heterospory?
1 Pinus
2 Selaginella
3 Dryopteris and moss
4 sunflower
Explanation:
The Dryopteris and Moss form monoecious gametophytes as all spores are uniform. The heterospory is the production of two different types of spores by the sporophytes of land plants. They are mostly found in some pteridophytes and all seed plants, i.e. Gymnosperms and Angiosperms, whereas the Bryophytes are not heterosporous.
AMU-2011
Plant kingdom
259456
The present day higher green plants are believed to have evolved from
1 ferns
2 green algae
3 liverworts
4 mosses
Explanation:
The present day higher green plants are believed to have evolved from ferns. They are believed to be originated during the late Palaeozoic era (about 250 million years ago).
AMU-1999
Plant kingdom
259457
Telome theory of Zimmerman (1930) applies only to:
1 bryophytes
2 pteridophytes
3 tracheophytes
4 all plants
Explanation:
The 'Telome theory' was proposed by Zimmerman (1930), he explained the origin of the megaphyll as well as of reproductive branches in vascular plants i.e. pteridophytes. The complex structures such as leaves (megaphylls) roots, reproductive organs, and other vascular plants evolved by the modification of terminal branches (telomes) of stems.
VMMC-2006
Plant kingdom
259458
Seed habit is developed first time in :
1 some ferns
2 some pinus
3 some monocots
4 some dicots
Explanation:
Seed habit was developed first time in some ferns. It is one of the most important aspects of evolution of land plants. The origin and evolution of seed habit started in late Devonian times. The earlier seed plants or plants with seed-like structures were found to have existed in the Devonian seed ferns Lyginopteris, an archetypal Pteridosperm.
259454
Azolla is used as a biofertilizer because it
1 multiplies very fast to produce massive biomass
2 has association of nitrogen-fixing Rhizobium
3 has association of nitrogen - fixing cyanobacteria
4 has association of mycorrhiza
Explanation:
Biofertilizers are microbe-containing compounds that help to promote plant and tree growth by increasing the supply of vital nutrients to plants. The main sources of biofertilizers are bacteria, fungi and cyanobacteria. Azolla is water fern which is also used as a biofertilizer. Symbiotic cyanobacteria Anabaena azollae is responsible for nitrogen-fixation which increases the fertility of the soil and in turn enhances the yield. Azolla pinnata, is used as an excellent fertilizer in rice field.
Rajasthan PMT-2010
Plant kingdom
259455
Which of these does not show heterospory?
1 Pinus
2 Selaginella
3 Dryopteris and moss
4 sunflower
Explanation:
The Dryopteris and Moss form monoecious gametophytes as all spores are uniform. The heterospory is the production of two different types of spores by the sporophytes of land plants. They are mostly found in some pteridophytes and all seed plants, i.e. Gymnosperms and Angiosperms, whereas the Bryophytes are not heterosporous.
AMU-2011
Plant kingdom
259456
The present day higher green plants are believed to have evolved from
1 ferns
2 green algae
3 liverworts
4 mosses
Explanation:
The present day higher green plants are believed to have evolved from ferns. They are believed to be originated during the late Palaeozoic era (about 250 million years ago).
AMU-1999
Plant kingdom
259457
Telome theory of Zimmerman (1930) applies only to:
1 bryophytes
2 pteridophytes
3 tracheophytes
4 all plants
Explanation:
The 'Telome theory' was proposed by Zimmerman (1930), he explained the origin of the megaphyll as well as of reproductive branches in vascular plants i.e. pteridophytes. The complex structures such as leaves (megaphylls) roots, reproductive organs, and other vascular plants evolved by the modification of terminal branches (telomes) of stems.
VMMC-2006
Plant kingdom
259458
Seed habit is developed first time in :
1 some ferns
2 some pinus
3 some monocots
4 some dicots
Explanation:
Seed habit was developed first time in some ferns. It is one of the most important aspects of evolution of land plants. The origin and evolution of seed habit started in late Devonian times. The earlier seed plants or plants with seed-like structures were found to have existed in the Devonian seed ferns Lyginopteris, an archetypal Pteridosperm.
