Our Home: Earth, a Unique Life Sustaining Planet
Short Questions
1. Why is Earth called a life-supporting planet?
Answer: Earth is called a life-supporting planet because it has suitable temperature, air, water, and atmosphere which allow living organisms to survive.
2. What is the crust of the Earth?
Answer: The crust is the thin outermost layer of the Earth where all living organisms, mountains, rivers, and oceans exist.
3. How many planets are there in the solar system?
Answer: There are eight planets in the solar system that revolve around the Sun.
4. Why is Venus the hottest planet in the solar system?
Answer: Venus is the hottest planet because its thick atmosphere traps heat through the greenhouse effect.
5. What is the habitable zone?
Answer: The habitable zone is the region around a star where the temperature is suitable for liquid water to exist.
6. Why is Earth known as the Blue Planet?
Answer: Earth is known as the Blue Planet because most of its surface is covered with water and it appears blue from space.
7. What is the atmosphere?
Answer: The atmosphere is the layer of gases surrounding the Earth that supports life and protects the planet.
8. What is the role of the ozone layer?
Answer: The ozone layer protects life on Earth by blocking harmful ultraviolet rays from the Sun.
9. What is Earth’s magnetic field?
Answer: Earth’s magnetic field is a protective shield that deflects harmful charged particles coming from space.
10. What is the hydrosphere?
Answer: The hydrosphere includes all the water present on Earth such as oceans, rivers, lakes, glaciers, and groundwater.
11. What is the biosphere?
Answer: The biosphere is the part of Earth where all living organisms exist and interact with the environment.
12. How do plants make food?
Answer: Plants make their food through photosynthesis using sunlight, carbon dioxide, and water.
13. Why is reproduction important for living organisms?
Answer: Reproduction is important because it ensures the continuity and survival of living species.
14. What is asexual reproduction?
Answer: Asexual reproduction is the process in which a single parent produces offspring identical to itself.
15. What are the main threats to life on Earth?
Answer: The main threats to life on Earth are climate change, pollution, and loss of biodiversity.
Long Questions
1. Why is Earth considered a unique planet?
Answer: Earth is considered a unique planet because it supports life. It has suitable temperature, liquid water, and an atmosphere containing oxygen. These conditions allow plants, animals, and humans to survive and grow.
2. Why is Earth’s distance from the Sun important for life?
Answer: Earth is located at the right distance from the Sun where the temperature is neither too hot nor too cold. This allows water to remain in liquid form. Liquid water is essential for the survival of living organisms.
3. Why is the size of Earth important for supporting life?
Answer: Earth has the right size and gravity to hold its atmosphere. If Earth were smaller, the atmosphere would escape into space. If it were much larger, gravity would be too strong for living beings.
4. How does Earth’s magnetic field protect life?
Answer: Earth’s magnetic field acts like a protective shield around the planet. It deflects harmful particles coming from the Sun and outer space. This protection helps maintain the atmosphere and supports life.
5. Why are air, water, and sunlight essential for life?
Answer: Air provides oxygen needed for respiration in living organisms. Water supports many biological processes and helps regulate temperature. Sunlight helps plants produce food through photosynthesis.
6. How do soil, rocks, and minerals help living organisms?
Answer: Soil contains nutrients that help plants grow and produce food. Rocks break down to form minerals needed by living organisms. These resources also support agriculture and human life.
7. What is the biosphere and why is it important?
Answer: The biosphere is the part of Earth where all living organisms exist. It includes land, water, and air where life interacts with the environment. The biosphere maintains ecological balance and supports life.
8. What is sexual reproduction?
Answer: Sexual reproduction is a process in which two parents, male and female, produce reproductive cells called gametes. These gametes combine to form a new organism. The offspring inherits characteristics from both parents.
9. What is climate change and how does it affect life?
Answer: Climate change refers to long-term changes in Earth’s temperature and weather patterns. It occurs mainly due to greenhouse gases released by human activities. It can cause rising sea levels, extreme weather, and harm to ecosystems.
10. How can humans protect life on Earth?
Answer: Humans can protect life on Earth by reducing pollution and conserving natural resources. Using renewable energy and planting more trees also helps. These actions maintain environmental balance and protect biodiversity.
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