Which aquatic fern is used to increase the yield in paddy crop? (a) Azolla (b) Salvinia (c) Marsilea (d) Isoetes

Which aquatic fern is used to increase the yield in
paddy crop?
(a) Azolla (b) Salvinia
(c) Marsilea (d) Isoetes
by

1 Answer

Answer :

(a) Azolla
by

Related questions

Which of the following fern is an excellent biofertilizer? (a) Marsilea (b) Pteridium (c) Azolla (d) Salvinia

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Last Answer : (c) Azolla

Which aquatic fern performs nitrogen fixation? (a) Azolla (b) Nostoc (c) Salvia (d) Salvinia

Description : Which aquatic fern performs nitrogen fixation? (a) Azolla (b) Nostoc (c) Salvia (d) Salvinia

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A water-fern, which is used as a green manure in rice fields, is (a) Salvinia (b) Mucor (c) Aspergillus (d) Azolla

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Ectophloic siphonostele is found in (a) Osmunda and Equisetum (b) Marsilea and Botrychium (c) Adiantum and Cucurbitaceae (d) Dicksonia and Maiden hair fern

Description : Ectophloic siphonostele is found in (a) Osmunda and Equisetum (b) Marsilea and Botrychium (c) Adiantum and Cucurbitaceae (d) Dicksonia and Maiden hair fern

Last Answer : (a) Osmunda and Equisetum

A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is (a) Tolypothrix (b) Chlorella (c) Nostoc (d) Anabaena.

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Azolla pinnata is a). a fern b). an algae c). a gymnosperm d). an angiosperm

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The biofertilizers are (a) Anabaena and Azolla (b) cow dung, manure and farmyard waste (c) quick growing crop ploughed under soil (d) none of these.

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Last Answer : (a) Anabaena and Azolla

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.Consider the following four statements whether they are correct or wrong. A. The sporophyte in liverworts is more elaborate than that in mosses. B. Salvinia is heterosporous. C. The life-cycle in all seed-bearing plants is diplontic. D. In Pinus, male and female cones are borne on different trees. The two wrong statements together are (a) A and C (b) A and D (c) B and C (d) A and B

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Last Answer : (b) A and D

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Examine the figures 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 (a) Chara Marchantia Fucus Pinus (b) Equisetum Ginkgo Selaginella Lycopodium (c) Selaginella Equisetum Salvinia Ginkgo (d) Funaria Adiantum Salvinia Riccia

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Last Answer : (c) Selaginella Equisetum Salvinia Ginkgo

Select the correct statement. (a) Sequoia is one of the tallest trees. (b) The leaves of gymnosperms are not well adapted to extremes of climate.(c) Gymnosperms are both homosporous and heterosporous. (d) Salvinia, Ginkgo and Pinus all are gymnosperms.

Description : Select the correct statement. (a) Sequoia is one of the tallest trees. (b) The leaves of gymnosperms are not well adapted to extremes of climate. (c) Gymnosperms are both homosporous and heterosporous. (d) Salvinia, Ginkgo and Pinus all are gymnosperms.

Last Answer : (a) Sequoia is one of the tallest trees.

Select the mismatch. (a) Cycas – Dioecious (b) Salvinia – Heterosporous (c) Equisetum – Homosporous (d) Pinus – Dioecious

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Last Answer : (d) Pinus – Dioecious

Which of the following statements is correct? (a) Ovules are not enclosed by ovary wall in gymnosperms. (b) Selaginella is heterosporous, while Salvinia is homosporous. (c) Horsetails are gymnosperms. (d) Stems are usually unbranched in both Cycas and Cedrus.

Description : Which of the following statements is correct? (a) Ovules are not enclosed by ovary wall in gymnosperms. (b) Selaginella is heterosporous, while Salvinia is homosporous. (c) Horsetails are gymnosperms. (d) Stems are usually unbranched in both Cycas and Cedrus.

Last Answer : (a) Ovules are not enclosed by ovary wall in gymnosperms.

Which one of the following is heterosporous? (a) Adiantum (b) Equisetum (c) Dryopteris (d) Salvinia

Description : Which one of the following is heterosporous? (a) Adiantum (b) Equisetum (c) Dryopteris (d) Salvinia

Last Answer : (d) Salvinia

Selaginella and Salvinia are considered to represent a significant step toward evolution of seed habit because (a) female gametophyte is free and gets dispersed like seeds (b) female gametophyte lacks archegonia (c) megaspores possess endosperm and embryo surrounded by seed coat (d) embryo develops in female gametophyte which is retained on parent sporophyte.

Description : Selaginella and Salvinia are considered to represent a significant step toward evolution of seed habit because (a) female gametophyte is free and gets dispersed like seeds (b) female gametophyte ... by seed coat (d) embryo develops in female gametophyte which is retained on parent sporophyte.

Last Answer : (b) female gametophyte lacks archegonia

The plant body is thalloid in (a) Sphagnum (b) Salvinia (c) Marchantia (d) Funaria.

Description : The plant body is thalloid in (a) Sphagnum (b) Salvinia (c) Marchantia (d) Funaria.

Last Answer : (c) Marchantia

Strobili cones are found in (a) Salvinia (b) Pteris (c) Marchantia (d) Equisetum.

Description : Strobili cones are found in (a) Salvinia (b) Pteris (c) Marchantia (d) Equisetum.

Last Answer : (d) Equisetum.

Select the mismatch (1) Cycas – Dioecious (2) Salvinia – Heterosporous (3) Equisetum – Homosporous (4) Pinus – Dioecious

Description : Select the mismatch (1) Cycas – Dioecious (2) Salvinia – Heterosporous (3) Equisetum – Homosporous (4) Pinus – Dioecious

Last Answer : (4) Pinus – Dioecious

Which of the following statement is correct ? (1) Ovules are not enclosed by ovary wall in gymnosperms (2) Selaginella is heterosporous, while Salvinia is homosporous (3) Horsetails are gymnosperms (4) Stems are usually unbranched in both Cycas and Cedrus

Description : Which of the following statement is correct ? (1) Ovules are not enclosed by ovary wall in gymnosperms (2) Selaginella is heterosporous, while Salvinia is homosporous (3) Horsetails are gymnosperms (4) Stems are usually unbranched in both Cycas and Cedrus

Last Answer : (1) Ovules are not enclosed by ovary wall in gymnosperms

Is it possible to purchase Azolla seeds?

Description : Is it possible to purchase Azolla seeds?

Last Answer : they use it in warm area to fertilize rice paddies. I guess it depends on where you live if it will grow. Also will spread and used for animals. This is in the fern family, does not have flowers.

Azolla increases soil fertility for – (1) maize cultivation (2) wheat cultivation (3) barley cultivation (4) rice cultivation

Description : Azolla increases soil fertility for – (1) maize cultivation (2) wheat cultivation (3) barley cultivation (4) rice cultivation

Last Answer : (4) rice cultivation Explanation: The nitrogen-fixing capability of Azolla has led to it being widely used as a biofertiliser for increasing the productivity of rice fields. When rice paddies ... can be inoculated with Azolla., which then quickly multiplies to cover the water, suppressing weeds.

The smallest flowering plant is - (1) Wolffia (2) Lemma (3) Azolla (4) Ficus

Description : The smallest flowering plant is - (1) Wolffia (2) Lemma (3) Azolla (4) Ficus

Last Answer : (1) Wolffia Explanation: Wolffia is a genus of 9 to 11 species which include the smallest flowering plants on Earth. Commonly called watermeal or duckweed, these aquatic plants resemble specks of ... together in pairs or form floating mats with related plants, such as Lemna and Spirodela species.

The second stage of hydrosere is occupied by plants like (a) Azolla (b) Typha (c) Salix (d) Vallisneria.

Description : The second stage of hydrosere is occupied by plants like (a) Azolla (b) Typha (c) Salix (d) Vallisneria.

Last Answer : (d) Vallisneria.

Farmers have reported over 50% higher yields of rice by using which of the following biofertilizer? (a) Cyanobacteria(b) legume-Rhizobium symbiosis (c) Mycorrhiza (d) Azolla pinnata

Description : Farmers have reported over 50% higher yields of rice by using which of the following biofertilizer? (a) Cyanobacteria (b) legume-Rhizobium symbiosis (c) Mycorrhiza (d) Azolla pinnata

Last Answer : (d) Azolla pinnata

Which of the following is the pair of biofertilizers? (a) Azolla and BGA (b) Nostoc and legume (c) Rhizobium and grasses (d) Salmonella and E.coli

Description : Which of the following is the pair of biofertilizers? (a) Azolla and BGA (b) Nostoc and legume (c) Rhizobium and grasses (d) Salmonella and E.coli

Last Answer : (a) Azolla and BGA

A nitrogen-fixing microbe associated with Azolla in rice fields is (a) Spirulina (b) Anabaena (c) Frankia (d) Tolypothrix.

Description : A nitrogen-fixing microbe associated with Azolla in rice fields is (a) Spirulina (b) Anabaena (c) Frankia (d) Tolypothrix.

Last Answer : (b) Anabaena

Which of the following is used as Biofertilizer? a) Rhizobium b) Blue-green algae c) Azolla d) All of these

Description : Which of the following is used as Biofertilizer? a) Rhizobium b) Blue-green algae c) Azolla d) All of these

Last Answer : d) All of these

Which of the following organisms is used as a biopesticide ? (l) Azolla (2) Anabaena (3) Rhizobium (4) Trichoderma

Description : Which of the following organisms is used as a biopesticide ? (l) Azolla (2) Anabaena (3) Rhizobium (4) Trichoderma

Last Answer : (4) Trichoderma