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Given below are two population pyramids, both of India, one for year 2000 and another for year 2020:

1. Pyramid A is of 2020 as it has a broader base
2. Pyramid B is of 2000 as it has more females in the younger age groups
3. Pyramid B is of 2020 as it has more females in the younger age groups
4. Pyramid A is of 2000 as it has a broader base
Subtopic:  Population Attributes |
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To evolve the desired traits, natural selection operates at the level of:
1. Organism 2. Population
3. Species 4. Biological community
Subtopic:  Population Attributes |
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Consider the given two statements:
Assertion (A): The tiger census in our national parks and tiger reserves is often based on pug marks and fecal pellets.
Reason (R): For ecological investigations, it is mandatory to know the absolute population densities in all instances.
 
1. Both (A) and (R) are True and (R) correctly explains (A).
2. (A) is True but (R) is False
3. (A) is False but (R) is True         
4. Both (A) and (R) are True but (R) does not correctly explain (A).
Subtopic:  Population Attributes |
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The population density of Siberian cranes at Bharatpur wetlands in a given year could be described as:
1. Low, because their numbers are typically fewer than 10.
2. High, because they congregate in large flocks.
3. Average, as they share resources with other wetland species.
4. Increasing, due to favourable habitat conditions.
Subtopic:  Population Attributes |
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Level 2: 60%+
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