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Our Home: Earth, a Unique Life Sustaining Planet — Practice

15 questions 15 min Recall + understand

  1. Q1. While there are perhaps billions of planets in the universe, life as we know it today exists and thrives on

  2. Q2. If the Earth were the size of an apple, the Earth's crust would be as thin as

  3. Q3. In order of increasing distance from the Sun, the third and fourth planets of our solar system are

  4. Q4. The range of distances from the Sun over which water can remain in liquid form on a planet is called the

  5. Q5. The habitable zone around a star is also sometimes called the

  6. Q6. Venus is the hottest planet in our solar system because

  7. Q7. When seen from space the Earth looks blue because

  8. Q8. The ozone layer in the Earth's atmosphere acts like a shield by blocking

  9. Q9. It is believed that the origin of Earth's magnetic field is

  10. Q10. All the water on Earth — in ponds, lakes, rivers, springs, seas, oceans and groundwater — together forms the

  11. Q11. The solid parts of the Earth, including rocks, soils and minerals, are known as the

  12. Q12. All living beings, along with the places where they live (land, water and air), make up the

  13. Q13. Reproduction is the process that ensures

  14. Q14. When a new plant grows from a leaf, stem or root planted in soil, this kind of reproduction is called

  15. Q15. In flowering plants, when the male and female gametes combine, the process is called

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