Chapter 13: Our Home: Earth, a Unique Life Sustaining Planet - Solutions

VIGYAN
Our Home Earth: Solutions Chapter 13: Our Home: Earth, a Unique Life Sustaining Planet - Solutions *Gyanpoints* Question 1 What is one major reason Mars cannot currently support life like Earth? (i) It has too many volcanoes. (ii) It is too close to the Sun. (iii) It lacks a thick atmosphere and liquid water. (iv) Its magnetic field is too strong. Answer: (iii) It lacks a thick atmosphere and liquid water. Explanation: Mars' atmosphere is 100 times thinner than Earth and cannot hold heat or protect from radiation. Atmospheric Pressure Ratio: P Mars ≈ 0.01 × P Earth (Mars has ~1% of Earth's atmospheric density) Question 2 Which of these is an example of geodiversity? (i) Variety of bird chirping in a forest. (ii) Different landforms like mountains, valleys, and deserts. (iii) Changing weather during monsoons. (iv) Number of different types of fish in a pond. Answer: (ii) Different landforms like mountains, valleys, and deserts. Question 3 If t…