Converting nitrate to nitrogen gas by anaerobes like Pseudomonas is:

1.nitrogen fixation2.ammonification
3.denitrification4.eutrophication

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 71%
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The highest net primary productivity per square meter is of:

1.open ocean2.boreal forest
3.tropical rainforest4.temperate forest

Subtopic:  Ecosystem Productivity |
 75%
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A secondary consumer amongst the following is:

1.a carnivore2.a herbivore
3.a plant4.apex predator

Subtopic:  Energy Flow |
 82%
From NCERT
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The productivity in an aquatic ecosystem is least likely to be limited by:

1.nitrogen2.carbon
3.phosphorus4.iron

Subtopic:  Ecosystem Productivity |
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In an ecosystem which of the following can never by inverted?
1. pyramid of numbers
2. pyramid of energy
3. pyramid of biomass
4. all can be inverted

Subtopic:  Ecological Pyramids |
 89%
From NCERT
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In boreal forests soils contain large amounts of carbon but the primary production is low compared to other types of forests. This can be explained by:
1. high rates of herbivory
2. slow weathering of rocks
3. periodic fires in the forests
4. restricted decomposition

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The amount of water required for a crop plant to produce one kilogram of food is approximately:
1. 1 Kg
2. 10 Kg
3. 100 Kg
4. 1000 Kg

Subtopic:  Ecosystem Productivity |
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A herbivore eats 4,000 J of plant material. 2200 J is indigestible and is eliminated as feces. 1,600 J are used in cellular respiration. What is the approximate production efficiency of this animal?

1.1%2.5%
3.10%4.50%

Subtopic:  Ecosystem Productivity |
 52%
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In the Hubbard Brook experiment, when the part of the forest was cut down
1. water flowed through the system at a greater rate
2. nitrogen began to accumulate in the system
3. more phosphorus was lost in stream runoff
4. carbon dioxide is released into the environment

Subtopic:  Components & Types of Ecosystems |
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Choose the correct chronological order [lowest to highest] of the production efficiency of the given animals:

1.mammals, fish, insects2.insects, fish, mammals
3.fish, insects, mammals4.insects, mammals, fish

Subtopic:  Ecosystem Productivity |
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