Tag: zoology

Quizzes (289) Questions (5869)

Questions Related to zoology

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’.

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

Blue-green algae are included in which of the following kingdoms?

  1. Monera

  2. Animalia

  3. Fungi

  4. Both B and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The kingdom monera is comprised of the prokaryotic organisms. The blue-green algae are included under the kingdom monera. These are the primitive form of prokaryotic organisms. They are unicellular or multicellular forming filamentous structures. They do not have well-developed cellular components such as a nuclear membrane, nucleus, mitochondria, etc. 

Thus, the correct answer is option A.

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

Cynobacteria are:

  1. mosses which attack bacteria.

  2. bacteria which attack cynophyceace

  3. autotrophic organism with phycocyanin

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The cyanobacteria (also referred to as blue-green algae) have chlorophyll a similar to green plants and are photosynthetic autotrophs. The cyanobacteria are unicellular, colonial or filamentous, fresh-water marine or terrestrial algae. The colonies are generally surrounded by a gelatinous sheath. They often form blooms in polluted water bodies. Some of these organisms can fix atmospheric nitrogen in specialized cells called heterocysts, e.g, Nostoc and Anabaena.

So the correct option is "autotrophic organisms with phycocyanin".