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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Natural reservoir of phosphorus is :    
1. Animal bones
2. Rock
3. Fossils
4.Sea water

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 87%
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Secondary productivity is rate of formation of new organic matter by:  
1. Parasite
2. Consumer
3. Decomposer
4. Producer

Subtopic:  Ecosystem Productivity |
 89%
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If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain?                                                                        
plant → mice → snake → peacock
1. 0.02 J
2. 0.002 J
3. 0.2 J
4. 0.0002 J

Subtopic:  Ecological Pyramids |
 71%

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Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.                                                            

Options :

A

B

C

D

1.

Rock minerals

Detritus

Litter fall

Producers

2.

Litter

Producers

Rock minerals 

Detritus

3.

Detritus 

Rock minerals

Producer

Litter fall

4.

Producers

Litter fall

Rock minerals 

Detritus

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 81%
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