Tag: biofertilizers

Questions Related to biofertilizers

What are used as green manure?

zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

  1. Melilotus parviflora

  2. Lens esculenta

  3. Crotalaria juncea

  4. All the above

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Correct Option: D
Explanation:

Green manures are fertilizers consisting of growing plants that are ploughed back into the soil.All the above are good examples of green manure.

Correct answer-D

Azolla is used as biofertilizer as it has

zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

  1. Rhizobium

  2. Cyanobacteria

  3. Mycorrhiza

  4. Large quantity of humus

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Correct Option: B

Sesbania rostrate is preferred as green manure over other species because.

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  1. It grows quickly

  2. It has extensive root system

  3. It possesses nodules on both stem and roots

  4. It possesses leaf nodules

Show answer
Correct Option: A
Explanation:

Sesbania rostrate is mainly used as green manure to improve the fertility of the soil due to its fast growth, high biomass production and the ability to convert atmospheric nitrogen into a usable form for plants.

Azolla pinnate is allowed to grow in rice fields because.

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  1. It does not disturb photosynthesis of Rice plants

  2. It provides food to fish

  3. It provides aeration to standing water

  4. It contains Anabaena

Show answer
Correct Option: D
Explanation:

Azolla free-floating freshwater fern that harbors nitrogen-fixing cyanobacterium Anabaena azollae by symbiosis relationship in its dorsal leaves. It is capable of fixing atmospheric carbon dioxide and nitrogen and is known as a potent nitrogen fixer.

This nitrogen-fixing capacity helps the plant benefit in a positive manner with the increase in yield and size and it served as the nitrogen requirement for rice.

The most potent biofertilizer for sugarcane is?

zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

  1. Azotobacier

  2. Acetobacrer

  3. Clostridium

  4. Rhizobium

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Correct Option: A

Neurospora is a very good taxon for.

zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

  1. Biofertilizer

  2. Biological control

  3. Genetically studies

  4. Antibiotics

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Correct Option: A

Which one of the following pairs serve as biofertilizers?

zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

  1. Albgo and Nostoc

  2. Frankia and Nostoc

  3. Pseudomonas and E.Coli

  4. Aspergillus's and Actinomycetes

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Correct Option: A

Consider the following statements.
Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to.
a. Resist drought and increase absorptive area
b. Tolerate extremes of pH.
c. Resist disease infestation
Of these statements.

zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

  1. $2$ and $3$ are correct

  2. $1$ and $2$ are correct

  3. $1$ and $3$ are correct

  4. $1, 2$ and $3$ are correct

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Correct Option: A

Which one of the following nutrients is not available in fertilizers?

zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

  1. Nitrogen

  2. Phosphorus

  3. Iron

  4. Potassium

Show answer
Correct Option: C
Explanation:

Fertilizers provide three main macronutrients: potassium, nitrogen and phosphorous which are consumed in larger quantities and are present in plant tissue, in quantities from 0.15% to 6.0% of a dry matter (DM) (0% moisture) basis. Iron is a micronutrient for plant growth which is not available in fertilizers.

So, the correct answer is option C.

Apogeotropic roots in Cycas look like corals of anthozoans (coelenterata) showing mutual association.

zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

  1. Cyanobacteria

  2. Bacteria

  3. Fungi

  4. Obligate parasite

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Correct Option: A
Explanation:

The apogeotropic or positively geotropic roots appear in Cycas sporophyte are called Corolloid roots or Corollorhiza. These roots looks like anthozoans or coelenterates. They contain Blue green algae or cyanobacteria like Nostoc and Anabaena, and perform symbiotic nitrogen fixation. They show mutual association with plant body.

So, the correct option is ‘Cyanobacteria’.