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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Match the following and select the correct option :  
(a) Earthworm                       (i) Pioneer species
(b) Succession                      (ii) Detrivore
(c) Ecosystem service           (iii) Natality
(d) Population growth            (iv) Pollination

     a       b       c      d
1. (i)      (ii)    (iii)    (iv)
2. (iv)     (i)    (iii)    (ii)
3. (iii)     (ii)   (iv)    (i)
4. (ii)      (i)    (iv)    (iii)

Subtopic:  Ecological Succession (OLD NCERT) |
 91%
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