Tag: carbon cycle

Questions Related to carbon cycle

The wormicide character of _____ destroys worms in water.

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Azotobacter

  2. Azolla

  3. Nostoc

  4. None of these

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Correct Option: A
Explanation:
The wormicide character that kills worms in water are Azotobactor.
Azotobactors are one of the Nitrogen-fixing bacteria. Hence they are used as bio-fertilisers for many plants. 
The size of Azotobactor varies from 1-20 μm in length and 1-2 μm. 
Azotobactors can be generally found in alkaline soil and aquatic regions. So, the correct answer is A.

The circulation of oxygen in various form through nature is called as

evs bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Respiration

  2. Circulation

  3. Oxygen cycle

  4. All of the above

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Correct Option: C

Which bacteria is responsible to fix nitrogen in leguminous plants?

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Azotobacter

  2. Rhizobium

  3. Clostridium

  4. Saccharomycese

Show answer
Correct Option: B
Explanation:

Some bacteria maintain the soil fertility and others enhance it. The fertility of the soil is proportional to the nitrogen content. Nitrogen is an important ingredient in the structure and function of the living beings. Nitrogen-fixing bacteria like Azotobacter, Clostridium live free in the soil and fix atmospheric nitrogen. Rhizobium like bacteria live symbiotically with root systems of leguminous plants and fix from the atmospheric nitrogen. Therefore, the correct answer is option B.

The microbial biofertilizers which can act both symbiotically and non-symbiotically to increases soil fertility are

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Azotobacter

  2. Rhizobium

  3. Clostridium

  4. `Nostoc and Anabaena

Show answer
Correct Option: A
Explanation:

Azotobacter can act both as symbiotically and non symbiotically to increase soil fertility. It Infuse the soil with antibiotic pesticides and inhabit the spread of soil borne diseases like pythium and phytophthora.

.......... oxygen is present in the atmosphere.

evs bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. 78%

  2. 21%

  3. 3%

  4. 1%

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Correct Option: B

Free living nitrogen fixing biofertilizer is

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Glomus

  2. Rhizobium

  3. Azotobacter

  4. Pseudomonas

Show answer
Correct Option: C
Explanation:

Azotobacter is a heterotrophic free living nitrogen fixing bacteria present in alkaline and neutral soils.

Some of the nutrient cycles are labelled as below. Sulphur
cycle (A), phosphorus cycle (B), carbon cycle (C) and
nitrogen cycle (D)
Of these, the sedimentary cycle is represented by

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. (A) only

  2. (B) only

  3. (C) only

  4. (A) and (B) only

  5. (C) and (D) only

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Correct Option: D

Who discovered oxygen?

evs bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Priestley

  2. Winogradsky

  3. Humphry

  4. None of the above

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Correct Option: A

Burning of fossil fuels affects

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Nitrogen cycle

  2. Carbon cycle

  3. Phosphorus cycle

  4. Water cycle

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Correct Option: B

The bacterium nitrobacter converts

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Nitrogen to nitrite

  2. Ammonia to nitrite

  3. Nitrite to nitrate

  4. Nitrate to nitrite

Show answer
Correct Option: C
Explanation:

Nitrification is a two step process of converting ammonia into nitrites and nitrites into nitrates. Bacteria converting ammonia into nitrites includes Nitrosomonas. Bacteria converting nitrites to nitrates includes Nitrobacter.

Thus, the correct answer is 'Nitrite to nitrate.'