Given below are two statements:
Statement I: Decomposition is a process in which the detritus is degraded into simpler substances by microbes.
Statement II: Decomposition is faster if the detritus is rich in lignin and chitin.
In the light of the above statements, choose the correct answer from the options given below: 
1. Statement I is correct incorrect but statement II is correct
2. Both statement I and II are correct
3. Both statement I and statement II are incorrect
4. Statement I is correct but statement II is incorrect 
Subtopic:  Decomposition |
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Which one of the following will accelerate phosphorus cycle?
1. Rain fall and storms
2. Burning of fossil fuels
3. Volcanic activity
4. Weathering of rocks

Subtopic:  Mineral Cycling & Ecosystem Services |
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Detritivores breakdown detritus into smaller particles. This process is called:
1. Decomposition
2. Catabolism
3. Fragmentation
4. Humification
Subtopic:  Decomposition |
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Identify the correct set of statements with regard to properties of humus 
(a) Highly resistant to microbial action 
(b) Dark-colored amorphous substance 
(c) End product of detritus food chain 
(d) Reservoir of nutrients 
(e) Undergoes decomposition very fast 
Choose the correct answer fro the options given below:
1. (a), (b) and (d) only 
2. (a),(b) and (e) only 
3. (a) and (b) only 
4. (b) , (c) and (a)

Subtopic:  Decomposition |
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Which of the following are not correct regarding decomposition  of wastes ? 
(a) Low temperature inhibits decomposition
(b) Warm and moist enviornment favours the process 
(c) The process is anaerobic 
(d) It is slower if detritus is rich in proteins and carbohydrates 
(e) Detritus is fegraded into simpler inorganic substance by fungal and bacterial enzymes 
Choose the correct answer from the options given below: 
1. (b) and (c) only 
2. (c) (a) and (d) only 
3. (c) and (d) only
4. (c) (d) and (e) only  
 

Subtopic:  Decomposition |
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Given below are two statements: 
Statement - I: Pyramid of energy is always upright and is the most efficient 
Statement-II: Pyramid of biomass in sea is generally inverted 
In the light of the above statements, choose the most appropriate answer from the options given below: 
1. Statements-I is correct but statement-II is incorrect 
2. Statements-I is incorrect but statement-II is correct 
3. Both statement-I and statements-II are correct 
4. Both statement-I and statement-II are incorrect 

Subtopic:  Ecological Pyramids |
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The pioneer species in a hydrarch succession are :
1. Free-floating angiosperms
2. Submerged rooted plants
3. Phytoplanktons
4. Filamentous algae
Subtopic:  Ecological Succession |
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The species that come to appear in bare area are called : 
1. Pioneer species
2. Invasive species
3. Competitive species
4. Species of seral community
Subtopic:  Ecological Succession |
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All successions irrespective of the habitat proceed to which type of climax community ?
1. Xeric
2. Mesic
3. Hydrophytic
4. Edaphic
Subtopic:  Ecological Succession |
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The amount of nutrients, such as carbon, nitrogen, phosphorus, calcium, etc. present in the soil at any given time, is referred to as the -

1. Nutrient status of soil

2. Standing state

3. Standing crop

4. Mineral state.

Subtopic:  Mineral Cycling & Ecosystem Services |
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