Tag: zoology

Questions Related to zoology

Which one of the following microorganisms forms a symbiotic association with plants and helps them in their nutrition?

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  1. Glomus

  2. Azotobacter

  3. Klebsielfa

  4. Azospirillium

Show answer
Correct Option: A
Explanation:

Several fungi are known to form symbiotic associations with plants, i.e., mycorrhiza. The most common fungal partners of mycorrhiza are Glomus species.

Study the following statements and select the correct ones.


(i) Methanogens are archaebacteria that produce methane in marshy areas.
(ii) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen.
(iii) Many members of the genus Glomus form mycorrhiza.

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  1. (i) and (ii)

  2. (i) and (iii)

  3. (ii) and (iii)

  4. (i), (ii) and (iii)

Show answer
Correct Option: C
Explanation:
1. Methanogens are archaebacteria belong to the domain of archaea, commonly found in wet, marshy areas,  They produce methane gas.
2. Nostoc is the filamentous blue-green alga. They form gelatin body which contains trichomes.
3. Glomus and it's all species form symbiotic relationships (mycorrhizas) with plant roots. 
So the correct answer is option D.

Which of the following statements is/are correct ?

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  1. In paddy fields, cyanobacteria serve as an important biofertiliser.

  2. Vermicompost consists of organic matter prepared by the action of earthworms on human or animal waste.

  3. The important examples of cyanobacteria as biofertilisers are Anabaena, Nostoc and Oscoilatoria.

  4. All of these

Show answer
Correct Option: B

Which of the following options includes biofertilisers ?

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  1. Cowdung manure and farmyard waste

  2. A quick growing crop ploughed back into the field

  3. Nostoc, Oscillatoria

  4. All of these

Show answer
Correct Option: A

Which was the first photosynthetic organism?

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  1. Green algae

  2. Red algae

  3. Cyanobacteria

  4. Brown algae

Show answer
Correct Option: C
Explanation:

Photosynthesis is the process by which light energy from the sun is used to synthesise sugars from carbon dioxide, releasing oxygen as a waste product. In primitive days, cyanobacteria were only the primary producers because the redox structure of oceans favoured them to fix nitrogen and also they had the capacity to use water as the source of electrons in photosynthesis. They made the atmosphere oxygen rich and allowed the appearance of aerobic organisms. 

Thus, the correct answer is option C.

Which one of the followings is not the characteristic feature of cyanobacteria?

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  1. They are always multicellular.

  2. They form colonies.

  3. They form blooms in polluted water bodies.

  4. They can fix atmospheric nitrogen.

Show answer
Correct Option: A
Explanation:

Cyanobacteria are unicellular prokaryotes that photosynthesise. They form huge colonies that appear as algal bloom in polluted waters. They can fix nitrogen from the atmosphere by means of specialised structures called as heterocysts.

Cow dung is appropriately used as

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

  1. Manure

  2. Perfume

  3. Medicine

  4. Building material

Show answer
Correct Option: A
Explanation:

Cow dung is available in plenty in India. It is used as manure or pattings for fuel. The cow dung solution has antifungal and insecticide properties. The application of cow dung also improves soil salinity and alkalinity. The presence of this manure helps in better nitrogen fixation through rhizobia.

So, the correct answer is option A.

During rainy seasons, the ground becomes slippery due to dense growth of

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  1. Lichens

  2. Bacteria

  3. Green algae

  4. Cyanobacteria

Show answer
Correct Option: D
Explanation:

Blue green algae or cyanobacteria synthesize a gelatinous mass around themselves, enclosing multiple filaments. This causes the surface area on which they thrive to be slippery

So, the correct answer is 'cyanobacteria'

Cyanobacteria is a

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  1. Virus which affect bacteria

  2. Bacteria which used cyanide as nutrition

  3. Algae which has blue-green pigment

  4. Colourful fungi

Show answer
Correct Option: C
Explanation:

Cyanobacteria are algae, which contains phycocyanin pigment and because of this pigment they are of blue-green colour and known as blue green algae.

Biofertilizers

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  1. Kill pests

  2. Prevent pest growth

  3. Retain soil fertility

  4. All of the above

Show answer
Correct Option: C
Explanation:

Biofertilizers are used because they increase soil fertility, crop productivity, and production. Use of biofertilizers is both economical as well as environment-friendly. They remain symbiotically associated with the roots while some are free living. They solubilize the undissolved minerals.

So, the correct answer is option C.