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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Vertical distribution of different species occupying different levels in a biotic community is

known as 

1. divergence

2. stratification

3. zonation

4. pyramid

Subtopic:  Introduction |
 92%
From NCERT
NEET - 2015
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Secondary succession takes place on/in

(1) bara rock

(2) degraded forest

(3) newly created pond

(4) newly cooled lava

Subtopic:  Ecological Succession (OLD NCERT) |
 84%
From NCERT
NEET - 2015
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The mass of living material at a tropic level at a particular time is called

1. Gross primary productivity

2. Standing state

3. Net primary productivity

4. standing crop

Subtopic:  Ecosystem Productivity |
 70%
From NCERT
NEET - 2015
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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.

Given below is a simplified model of phosphorus cycling in a terrestrial  ecosystem - NEETLab

A B C D
1. Rock minerals Detritus Litterfall Producers
2. Litterfall Producer Rock minerals Detritus
3. Detritus Rock minerals Producer Litterfall
4. Producer Litterfall Rock minerals Detritus
Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 81%
From NCERT
NEET - 2014
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Secondary productivity is rate of formation of new organic matter by

1. producer

2. parasite

3. consumer

4. decomposer

Subtopic:  Ecosystem Productivity |
 86%
From NCERT
NEET - 2013
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