In India, we find mangoes with different flavours, colours, fibre content, sugar content and even shelf-life. The large variation is on account of  

(1)  species diversity    

(2)  induced mutations    

(3)  genetic diversity    

(4)  hybridisation.

Subtopic:  Introduction & Types |
 72%
From NCERT
AIIMS - 2006
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What is PAR range?

(1) 200 nm - 800 nm          

(2) 400 nm - 700 nm

(3) 350 nm - 550 nm         

(4) 600 nm - 100 nm

Subtopic:  Energy Flow |
 83%
AIIMS - 2007
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The bacteria which attack dead animals are 
(1) first link of the food chain and are known as primary producers.

(2) Second link of the food chain and are herbivorous

(3) third link of the food chain and are tertiary consumers

(4) the end of food chain and are decomposers.

Subtopic:  Decomposition |
 82%
AIIMS - 2008
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Which of the following has highest diversity in India?

(1) Mango

(2) Dolphin

(3) Tiger

(4) Orchids

Subtopic:  Introduction & Types |
 87%
AIIMS - 2010
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Animals take phosphorous from 
(1) water 

(2) plants

(3) rock 

(4) soil.

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
From NCERT
AIIMS - 2010
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Most animals that live in deep oceanic waters are

(1) Tertiary consumers

(2) Detritivores

(3) Primary consumers

(4) Secondary consumers

Subtopic:  Decomposition |
 68%
AIIMS - 2016
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Keystone species deserve protection because these

(1) are capable of surviving in harsh environmental conditions

(2) indicate presence of certain minerals in the soil

(3) have become rare due to overexploitation

(4) play an important role in supporting other species.

Subtopic:  Ecological Succession (OLD NCERT) |
 74%
AIIMS - 2017
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Energy flow in an ecosystem is 

(1) unidirectional

(2) bidirectional

(3) multi-directional

(4) All the these 

Subtopic:  Energy Flow |
 93%
From NCERT
AIIMS - 2012
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In a stable ecosystem, which of the following limits the number of trophic levels?

(1) Biomass

(2) The number of nutrients

(3) Availability of nutrients

(4) Presence of contaminants that increase in concentration along the food chain

Subtopic:  Energy Flow |
 53%
AIIMS - 2010
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Most of the world's carbon is found:

1. As carbon dioxide in the atmosphere.

2. In living organisms.

3. As bicarbonate and carbonate ions dissolved in the oceans.

4. As carbonate minerals in sedimentary rock.

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 76%
From NCERT
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