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Q. No.Which of the following feature(s) should be shown by a stable community?
| 1. | Resistant to invasion of alien species |
| 2. | Resistant to occasional disturbances |
| 3. | Less variation in year-to-year productivity |
| 4. | All of these |
Subtopic: Â Importance of Biodiversity |
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Level 1: 80%+
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What analogy did Paul Ehrlich use to explain the importance of species diversity in ecosystems?
| 1. | An ecosystem as a large machine with each species as a gear |
| 2. | An airplane held together by rivets, where each rivet represents a species |
| 3. | A forest with each tree representing a different ecosystem function |
| 4. | A river where each drop of water symbolizes a different species |
Subtopic: Â Importance of Biodiversity |
 94%
Level 1: 80%+
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A keystone species is one that
| 1. | Is most abundant |
| 2. | Is the top carnivore only |
| 3. | Is rare but has large impact on community structure |
| 4. | Has highest reproductive rate |
Subtopic: Â Importance of Biodiversity |
 91%
Level 1: 80%+
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The largely tropical Amazonian rain forest in South America
1. Produce 20% of the total in the earth's atmosphere
2. Has 3000 species of birds
3. Has 378 species of fishes
4. Is home to 4000 species of plants
Subtopic: Â Importance of Biodiversity |
 90%
Level 1: 80%+
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Which of the following is a characteristic of a stable community?
| 1. | High variation in productivity from year to year |
| 2. | Susceptibility to invasions by alien species |
| 3. | Inability to recover from environmental changes |
| 4. | Resistance or resilience to occasional disturbances |
Subtopic: Â Importance of Biodiversity |
 86%
Level 1: 80%+
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The relationship between ecosystem stability and biodiversity is:
1. Inversely proportional
2. Directly proportional
3. No relationship
4. Random relationship
1. Inversely proportional
2. Directly proportional
3. No relationship
4. Random relationship
Subtopic: Â Importance of Biodiversity |
 85%
Level 1: 80%+
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What do you mean by bioprospecting?
| 1. | Biological analysis of living things to classify them |
| 2. | Exploring molecular, genetic and species-level diversity for products of economic importance |
| 3. | Exploring forests to identify diversity present there |
| 4. | It is branch of biology which deals with prospect of conservation |
Subtopic: Â Importance of Biodiversity |
 93%
Level 1: 80%+
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Read the following statement carefully.
'Amazon forest is estimated to produce, through photosynthesis, 20 percent of the total oxygen in the earth's atmosphere'.
This is _______ aspect for conserving biodiversity
1. Narrowly utilitarian
2. Broadly utilitarian
3. Economic aspect
4. Ethical
Subtopic: Â Importance of Biodiversity |
 83%
Level 1: 80%+
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Which consumptive use value of biodiversity provides materials like cotton and jute?
1. Food value
2. Medicine value
3. Fuel value
4. Fiber value
1. Food value
2. Medicine value
3. Fuel value
4. Fiber value
Subtopic: Â Importance of Biodiversity |
 85%
Level 1: 80%+
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