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What is Population Growth (human)?
Grade Level:
Class 7
Space Technology, EVs, Climate Change, Biotechnology, HealthTech, Robotics, Chemistry, Physics
Definition
What is it?
Population growth means an increase in the number of people living in a particular area, like a city, state, or country, over a specific period. It happens when more people are born or move into an area than those who die or move out.
Simple Example
Quick Example
Imagine a small village in Rajasthan. If last year there were 500 people, and this year there are 520 people, then the village's population has grown by 20 people. This increase could be due to more babies being born or new families moving in for work.
Worked Example
Step-by-Step
Let's calculate the population growth of a city in Uttar Pradesh.
Step 1: Find the initial population. Suppose the city's population in 2020 was 10,00,000 people.
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Step 2: Find the final population. In 2023, the city's population became 10,50,000 people.
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Step 3: Calculate the change in population. Subtract the initial population from the final population: 10,50,000 - 10,00,000 = 50,000 people.
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Step 4: State the population growth. The city experienced a population growth of 50,000 people between 2020 and 2023.
Why It Matters
Understanding population growth helps scientists and engineers plan for the future, whether it's designing smarter cities with better transport (EVs, Robotics) or developing new healthcare solutions (HealthTech). It's crucial for urban planners, environmental scientists, and government policy makers to ensure resources are available for everyone.
Common Mistakes
MISTAKE: Thinking population growth only means more births. | CORRECTION: Population growth also includes people moving into an area (immigration) and subtracts people moving out (emigration) or dying.
MISTAKE: Confusing population growth with population size. | CORRECTION: Population size is the total number of people at one time, while population growth is how much that number changes over a period.
MISTAKE: Assuming population growth is always a positive number. | CORRECTION: If more people die or move out than are born or move in, the population can actually decrease, leading to negative growth or population decline.
Practice Questions
Try It Yourself
QUESTION: A town in Kerala had 25,000 people in 2015. By 2020, it had 28,000 people. What was the population growth? | ANSWER: 3,000 people
QUESTION: In a village, 100 babies were born and 50 people died in one year. 20 people moved into the village, and 10 people moved out. If the initial population was 1,000, what is the new population? | ANSWER: 1,060 people (1000 + 100 - 50 + 20 - 10 = 1060)
QUESTION: India's population was approximately 1.3 billion in 2015 and 1.4 billion in 2023. Calculate the population growth over these 8 years. If this growth rate continues, what challenges might India face in providing resources? | ANSWER: Growth = 0.1 billion (or 100 million) people. Challenges could include increased demand for food, water, housing, jobs, and infrastructure like roads and schools.
MCQ
Quick Quiz
Which of these factors contributes to population growth?
High death rate
More people moving out of a region
Low birth rate
More births than deaths
The Correct Answer Is:
D
Population growth occurs when the number of births exceeds the number of deaths, and when more people move into an area than move out. Options A, B, and C would lead to a decrease or slower growth.
Real World Connection
In the Real World
The Indian government uses population growth data collected by agencies like the Census of India to plan for future needs. For example, knowing how many more people will live in Mumbai helps city planners decide where to build new metro lines, schools, and hospitals, or how much water supply will be needed.
Key Vocabulary
Key Terms
BIRTH RATE: The number of live births per 1,000 people in a year | DEATH RATE: The number of deaths per 1,000 people in a year | IMMIGRATION: People moving into a country or region | EMIGRATION: People moving out of a country or region | POPULATION DENSITY: The number of people living per unit area
What's Next
What to Learn Next
Now that you understand population growth, you can explore 'Factors Affecting Population Change' to learn about the reasons behind these changes, like healthcare improvements or economic opportunities. This will help you see the bigger picture of how societies evolve.
