Most food chains are composed of 

1. 1 or 2 species

2. 3 or 4 species

3. 9 or 10 species

4. More than 16 species

Subtopic:  Energy Flow |
 76%
From NCERT
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The phosphorus cycle is unusual in that it is entirely:

1. Within aquatic ecosystems

2. Within terrestrial ecosystems

3. Sedimentary

4. Gaseous

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 73%
From NCERT
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Most primary productivity in the surface water of lakes and oceans is by:
1. Floating plants
2. Red and brown algae
3. Zooplankton
4. Phytoplankton

Subtopic:  Energy Flow |
 72%
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During ecological succession

(1) the gradual and predictable change in species composition occurs in a given area

(2) the establishment of a new biotic community is very fast in its primary phase

(3) the numbers and types of animals remain constant

(4) the changes lead to a community that is in near equilibrium with the environment and is called pioneer community

Subtopic:  Ecological Succession (OLD NCERT) |
 71%
From NCERT
NEET - 2015
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Which ecosystem has the maximum biomass?

(1) Forest ecosystem 

(2) Grassland ecosystem 

(3) Pond ecosystem 

(4) Lake ecosystem 

Subtopic:  Components & Types of Ecosystems |
 72%
NEET - 2017
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Th primary producers of the deep-sea hydrothermal vent ecosystem are

(1) green algae

(2) chemosynthetic bacteria

(3) blue-green algae

(4) coral reefs

Subtopic:  Energy Flow |
 59%
NEET - 2016
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Which one of the following is a characteristic feature of cropland ecosystem?

(1) Least genetic diversity

(2) The absence of weeds

(3) Ecological succession

(4) The absence of soil organisms

Subtopic:  Components & Types of Ecosystems |
 54%
NEET - 2016
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Which of the following would appear as the pioneer organisms on bare rocks?
(1) Liverworts

(2) Mosses

(3) Green algae

(4) Lichens

Subtopic:  Ecological Succession (OLD NCERT) |
 88%
From NCERT
NEET - 2016
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The term ecosystem was coined by

(1) AG Tansley                 

(2) E Haeckel

(3) E Warming                 

(4) EP Odum

Subtopic:  Introduction |
 65%
NEET - 2016
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In which of the following both pairs have the correct combination?

1. Gaseous nutrient cycle
Sedimentary nutrient cycle 
Carbon and nitrogen
Sulphur and phosphorus
2.  Gaseous nutrient cycle
Sedimentary nutrient cycle 
Carbon and sulphur
Nitrogen and phosphorus
3. Gaseous nutrient cycle
Sedimentary nutrient cycle
Nitrogen and sulphur
Carbon and phosphorus
4. Gaseous nutrient cycle
Sedimentary nutrient cycle
Sulphur and phosphorus
Carbon and nitrogen 
Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 87%
From NCERT
NEET - 2015
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