Both, hydrarch and xerarch successions lead to:  
1. Medium water conditions
2. Xeric conditions
3. Highly dry conditions
4. Excessive wet conditions

Subtopic:  Ecological Succession (OLD NCERT) |
 80%
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The breakdown of detritus into smaller particles by earthworm is a process called 
1. Humification
2. Fragmentation
3. Mineralisation
4. Catabolism

Subtopic:  Decomposition |
 86%
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Which one of the following is not a gaseous biogeochemical cycle in ecosystem ?  
1. Sulphur cycle
2. Phosphorus cycle
3. Nitrogen cycle
4. Carbon cycle

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 71%
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Identify the possible link "A" in the following food chain :    
Plant → insect - frog → "A" → Eagle
1. Rabbit
2. WoIf
3. Cobra
4. Parrot

Subtopic:  Energy Flow |
 90%

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Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels?                                                 

 
 

1.  Level PC is "insects" and level SC is "small insectivorous birds".
2.  Level PP is "phytoplanktons" in sea and "Whale" on top level TC
3.  Level PP is "pipal trees" and level SC is "sheep".
4.  Level PC is "rats" and level SC is "cats".

Subtopic:  Ecological Pyramids |
 53%

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Which one of the following is not a functional unit of an ecosystem 
1. Energy flow
2. Decomposition
3. Productivity
4. Stratification

Subtopic:  Components & Types of Ecosystems |
 83%
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The upright pyramid of number is absent in      
1. Pond
2. Forest
3. Lake
4. Grassland

Subtopic:  Ecological Pyramids |

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Identify the likely organisms (a), (b), (c) and (d) in the food web shown below:     

Options

(a)

(b)

(c)

(d)

1.

deer

rabbit

frog

rat

2.

dog

squirrel

bat

deer

3.

rat

dog

tortoise

crow

4.

squirrel

cat

rat

pigeon

Subtopic:  Energy Flow |
 90%

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The rate of formation of new organic matter by rabbits in grassland is called:

1. Net productivity 2. Secondary productivity
3. Net primary productivity 4. Gross primary productivity
Subtopic:  Ecosystem Productivity |
 82%
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The second stage of hydrosere is occupied by plants like :   
1. Azolla
2.Typha
3.Salix
4. Vallisneria

Subtopic:  Ecological Succession (OLD NCERT) |
 65%

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