| 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 | 
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | Organism | 2. | Population | 
| 3. | Species | 4. | Biological community | 
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 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). | 
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 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. | 
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology