A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :

1. 15

2. 05

3. zero

4. 10

Subtopic:  Population Characters: Density |
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NEET 2023 - Target Batch - Aryan Raj Singh
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A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations. A and B are twenty years apart. Select the correct interpretation about them: 
 
Interpretations

1. 'A' is more recent and shows a slight reduction in the growth rate
2. 'B' is an earlier pyramid and shows stabilised growth rate
3. 'B' is more recent showing that the population is very young
4. 'A' is the earlier pyramid and no change has occurred in the growth rate

Subtopic:  Population Characters: Density | Population Characters: Age Structure & Migration |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology