MCQs On Nitrogen Cycle
Instructions: You have 15min time to complete the test. You can modify your answer any number of times while the test is in progress. To submit the test, click the submit button. Once you have clicked the submit button, the answers can not be changed.
- 1.Nitrogen is absorbed by the plants in the form of
- A.
Ammonium
- B.
Nitrites
- C.
Nitrates
- D.
All
- 2.Which of the following statements is correct?
- A.
Atmosphere is the major reservoir for plants
- B.
Nitrogen is the most abundant nutrient for plants
- C.
Nitrogen cycle is a sedimentary cycle
- D.
All
- 3.Nitrogen fixation is the conversion of
- A.
Nitrogenase and hydrogenase
- B.
Nitrogenase and hexokinase
- C.
Nitrogenase and peptidase
- D.
Nitrogenase and hydrolyase
- 4.Symbiotic nitrogen-fixing cyanobacteria are not present in
- A.
Azolla
- B.
Gnetum
- C.
Anthoceros
- D.
Cycas
- 5.How many molecules of ATP are required to fix one molecule of nitrogen?
- A.
12
- B.
20
- C.
6
- D.
16
- 6.Ammonification is the formation of
- A.
Ammonia from nitrates by decomposers
- B.
Ammonia from nitrogen
- C.
Ammonia from amino acids
- D.
Ammonia from nitrates by nitrogen fixers
- 7.Conversion of nitrates to nitrogen is called
- A.
Ammonification
- B.
Nitrification
- C.
Nitrogen fixation
- D.
Denitrification
- 8.Conversion of nitrites to nitrates is called
- A.
Nitrosococcus
- B.
Clostridium
- C.
Nitrobacter
- D.
Nitrosomonas
- 9.Conversion of ammonia to nitrite and then to nitrates is called
- A.
Ammonification
- B.
Denitrification
- C.
Assimilation
- D.
Nitrification
- 10.Baval trees should be planted and used to prevent and control
- A.
Water pollution
- B.
Air pollution
- C.
Soil pollution
- D.
Noise Pollution
- 11.Depletion of ozone layer causes, Which of the following? 1. Cataract in eyes leading to blindness 2. Reduced productivity of forests 3. Lung infection
- A.
Only 1
- B.
Only 1 and 2
- C.
Only 2 and 3
- D.
1,2 and 3
- 12.The protocol which decided to completely phase out CFC is
- A.
Cartagena protocol
- B.
Stockholm Convention
- C.
Montreal protocol
- D.
Kyoto protocol
- 13.Which of the following is/are not Green House Gases? 1. Nitrous oxide 2. Ozone 3. Sulphur dioxide
- A.
Only 3
- B.
Only 1 and 2
- C.
Only 2 and 3
- D.
1,2 and 3
- 14.With reference to effect of green house gases, Which of the following is/are true? 1. Changes to plant growth and nutrition levels 2. Ozone depletion 3. Smog pollution Select the correct answer from the following codes
- A.
Only 1
- B.
Only 1 and 2
- C.
Only 2 and 3
- D.
1,2 and 3
- 15.With reference to sources of water pollution, which of the following is/are true? 1. Natural Sources 2. Domestic Sources 3. Agricultural Sources 4. Industrial Sources
- A.
Only 4
- B.
Only 2, 3 and 4
- C.
Only 3 and 4
- D.
1,2, 3 and 4
- 16.Which of the following chemicals cause water pollution? 1. Arsenic 2. Copper 3. Zinc Select the correct answer from the following codes
- A.
Only 1
- B.
Only 1 and 2
- C.
Only 2 and 3
- D.
1,2 and 3
- 17.Which of the following pairs are correctly matched? Pollutant Disease 1. Arsenic Skin Cancer 2. Lead Itai – Itai 3. Cadmium displexia
- A.
Only 1
- B.
Only 1 and 2
- C.
Only 2 and
- D.
1,2 and 3
- 18.Consider the following statements 1. The Biological Demand for oxygen is directly proportional to the quantity of discharge of waste in water bodies. 2. Increase in water temperature decreases dissolved oxygen in water which adversely affects aquatic life. Select the correct answer from the following codes
- A.
Only 1
- B.
Only 2
- C.
Both 1 and 2
- D.
Neither 1 nor 2
- 19.With reference to Eutrophication, Which of the following is/are true? 1. It is phenomenon of nutrient enrichment of a water body 2. It depletes the water of dissolved oxygen (DO). 3. Human activities are mainly responsible for the eutrophication Select the correct answer from the following codes
- A.
Only 1
- B.
Only 1 and 2
- C.
Only 2 and 3
- D.
1,2 and 3
- 20.The natural residence of every organism is known as:
- A.
Biome
- B.
Niche
- C.
Habit
- D.
Habitat
- 21.What is the name of the feature that allows organisms to survive in the conditions of its habitat?
- A.
Adjustment
- B.
Adaptation
- C.
Acclimatisation
- D.
Adaptative Variation
- 22.Shelford’s law of tolerance is named after:
- A.
James Shelford
- B.
Jacob Shelford
- C.
Ernest Shelford
- D.
None of these
- 23.Shelford’s law of tolerance suggests that organisms with a wide tolerance limit for environmental factors show:
- A.
Narrow distribution with low population
- B.
Wide distribution with high population
- C.
Wide distribution with high population
- D.
Narrow distribution with high population
- 24.Wide variety of living organisms is called:
- A.
Biodiversity
- B.
Population
- C.
Habitat
- D.
Diversity
- 25.Animal adopt a similar state like sleep to reduce their metabolic rate, it is called:
- A.
Migration
- B.
Transpiration
- C.
Hibernating
- D.
None of These
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