Tag: microbes in human welfare

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Questions Related to microbes in human welfare

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".

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

Azolla gives a good biofertilizer when mixed with

  1. Bone-meal

  2. Cowdung

  3. Blue-green algae

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

BGA and Azolla have known to be used for the rice cultivation and they are very good for increasing the crop yield and productivity as they supply the soil and the plant with enough nitrogen. They are known used together as the biofertilizers.


So, the correct option is 'Blue-green algae'

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

In the beginning there was no oxygen in earth's atmosphere. The activity of which organism is generally supposed to have made the earth's atmosphere aerobic or oxygen-rich?

  1. Monocotyledons

  2. Filamentous algae

  3. Cyanobacteria

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

Cyanobacteria also known as Cyanophyta, are a phylum of bacteria that obtain their energy through photosynthesis, and are the only photosynthetic prokaryotes able to produce oxygen. The name "cyanobacteria" comes from the color of the bacteria. Cyanobacteria, which are prokaryotes, are also called "blue-green algae", though the term "algae" in modern usage is restricted to eukaryotes. Phototrophic eukaryotes perform photosynthesis by plastids that may have their ancestry in cyanobacteria, acquired long ago via a process called endosymbiosis. These endosymbiotic cyanobacteria in eukaryotes may have evolved or differentiated into specialized organelles such as chloroplasts, etioplasts and leucoplasts. By producing and releasing oxygen (as a byproduct of photosynthesis), cyanobacteria are thought to have converted the early oxygen-poor, reducing atmosphere into an oxidizing one, causing the Great Oxygenation Event and the "rusting of the Earth", which dramatically changed the composition of the Earth's life forms and led to the near-extinction of anaerobic organisms.

So the correct option is 'cyanobacteria'.

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

Which of the following plants can act as a biofertilizer

  1. Nostoc

  2. Funaria

  3. Volvox

  4. Rhizopus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nostoc belongs to cyanobacteria genus, and it can be used as biofertilizer. It is also called the blue-green algae. Nostoc converts atmospheric nitrogen into ammonia, which can be further converted to a suitable form for plant growth. Biofertilizers enhance the quality of plants and soil.

So the correct answer is 'Nostoc'.

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

What is the photosynthetic product in blue-green algae?

  1. Normal starch

  2. Glycogen

  3. Cyanophycean starch resembling glycogen

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Blue-green algae, also called cyanobacteria, any of a large, heterogeneous group of prokaryotic, principally photosynthetic organisms. Cyanobacteria resemble the eukaryotic algae in many ways, including morphological characteristics and ecological niches, and were at one time treated as algae, hence the common name of blue-green algae. The process of photosynthesis goes on in cyanobacteria in the same manner as in plants. The storage food products in cyanobacteria are somewhat different from those of green plants. The storage product is usually a starch like substance similar to glycogen and is different from the starch produced in plants. This is known as Cyanophycean starch.

So, the correct answer is 'Cyanophycean starch resembling glycogen'.