Ecotone is

1. a polluted area

2. the bottom of a lake

3. a zone of transition between two communities

4. a zone of developing community

Subtopic:  Introduction to Ecology |
 83%
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Biosphere is

1. a component in the ecosystem
2. composed of the plants present in the soil
3. life in the outer space
4. composed of all living organisms present on earth which interact with the physical environment

Subtopic:  Introduction to the Chapter |
 92%
From NCERT
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Ecological niche is

1. the surface area of the ocean
2. an ecologically adapted zone
3. the physical position and functional role of a species within the community
4. formed of all plants and animals living at the bottom of a lake

Subtopic:  Introduction to the Chapter |
 93%
From NCERT
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If a population of 50 Paramecium present in a pool increases to 150 after an hour, what would be the growth rate of the population?

1. 50 per hour

2. 200 per hour

3. 5 per hour

4. 100 per hour

Subtopic:  Population: Logistic Growth Model |
 67%
From NCERT
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What would be the percent growth or birth rate per individual per hour for the same population mentioned in the previous question (Question 10)?

1. 100

2. 200

3. 50

4. 150

Subtopic:  Population: Logistic Growth Model |
 53%
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A population has more young individuals compared to older individuals. What would be the status of the population after some years?

1. It will decline

2. It will stabilize

3. It will increase

4. It will first decline and then stabilize

Subtopic:  Population Characters: Density |
 82%
From NCERT
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What parameters are used for tiger census in our country's national parks and sanctuaries?

1. Pug marks only

2. Pug marks and fecal pellets

3. Fecal pellets only

4. Actual headcounts

Subtopic:  Population Attributes |
 94%
From NCERT
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Which of the following would necessarily decrease the density of a population in a given habitat?

1. Natality> mortality

2. Immigration> emigration

3. Mortality and emigration

4. Natality and immigration

Subtopic:  Population Characters: Density |
 91%
From NCERT
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A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?

1. 128

2. 24

3. 64

4. 32

Subtopic:  Population: Exponential Growth Model |
 74%
From NCERT
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In 2005, for each of the 14 million people present in a country, 0.028 were born and 0.008 died during the year. Using exponential equation, the number of people present in 2015 is predicted as

1. 25 millions

2. 17 millions

3. 20 millions

4. 18 millions

 57%
From NCERT
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