Tag: biofertilizers

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Questions Related to biofertilizers

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

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

  1. It grows quickly

  2. It has extensive root system

  3. It possesses nodules on both stem and roots

  4. It possesses leaf nodules
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Azolla pinnate is allowed to grow in rice fields because.

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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.

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

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

  1. Nitrogen

  2. Phosphorus

  3. Iron

  4. Potassium
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Cyanobacteria

  2. Bacteria

  3. Fungi

  4. Obligate parasite
Reveal answer Fill a bubble to check yourself
A Correct answer
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’.