SEBA Class 7 Science Chapter 6 Climate Change And Its Impact

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SEBA Class 7 Science Chapter 6 Climate Change And Its Impact

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Climate Change And Its Impact

Chapter: 6

PART – I

EXERCISES

1. Darken the circle for correct answer.

(i) Which gas is the main cause of global warming?

(a) Oxygen.

(b) Carbon dioxide.

(c) Hydrogen.

(d) Nitrogen.

Ans: (b) Carbon dioxide.

(ii) Which of the following is not a greenhouse gas?

(a) Carbon dioxide.

(b) Methane.

(c) Nitrous oxide.

(d) Oxygen.

Ans: (d) Oxygen.

(iii) Climate change mainly refers to:

(a) Daily weather changes.

(b) Weekly weather changes.

(c) Long-term changes in temperature and rainfall.

(d) Change of climate with seasons.

Ans: (c) Long-term changes in temperature and rainfall.

(iv) Planting more trees helps in-

(a) Increasing global warming.

(c) Increasing ozone hole.

(b) Reducing oxygen.

(d) Reducing carbon dioxide.

Ans: (d) Reducing carbon dioxide.

(v) Melting of glaciers due to climate change causes:

(a) Earthquake.

(b) Volcano.

(c) Floods and sea level rise.

(d) Landslide.

Ans: (c) Floods and sea level rise.

2. Fill in the blanks.

(a) The gradual increase in Earth’s average temperature is called __________.

Ans: Global Warming.

(b) __________ is the main greenhouse gas released from vehicles.

Ans: Carbon dioxide.

(c) The process of cutting down forests is called ___________.

Ans: Deforestation.

(d) Planting trees increases in the atmosphere.

Ans: Oxygen.

(e) Deforestation increases the amount of __________ in the atmosphere.

Ans: Carbon dioxide.

3. True or False:

(a) Climate change only affects humans, not animals. (True/False)

Ans: False.

(b) Burning fossil fuels adds greenhouse gases to the atmosphere. (True/False)

Ans: True.

(c) Deforestation helps in reducing global warming. (True/False)

Ans: False.

(d) Global warming has no connection with sea level rise. (True/False)

Ans: False.

(e) Planting trees is one solution to reduce climate change. (True/False)

Ans: True.

4. Match the following:

Column A	Column B
(a) Methane	(i) Released by burning fossil fuels
(b) Sea level rise	(ii) Rise’s in Earth’s temperature
(c) Global Warming	(iii) Melting of glaciers
(d) Carbon Dioxide	(iv) Green house gas from cattle.

Ans: 

Column A	Column B
(a) Methane	(iv) Green house gas from cattle.
(b) Sea level rise	(iii) Melting of glaciers.
(c) Global Warming	(ii) Rise’s in Earth’s temperature.
(d) Carbon Dioxide	(i) Released by burning fossil fuels.

5. Name and describe briefly the different climatic zones of India.

Ans: India is divided into several climatic zones based on distinct weather patterns, temperature, and rainfall:

(i) Tropical wet: These areas receive heavy rainfall (exceeding 2000 mm per year) and remain humid and green throughout the year (e.g., Western Ghats, Kerala, Assam).

(ii) Tropical Wet and Dry: Characterized by distinct wet and dry seasons with moderate to heavy monsoon rainfall and very hot summers (e.g., Deccan Plateau, West Bengal).

(iii) Sub-Tropical Humid: These regions have very hot, humid summers and very cold, dry winters with moderate to heavy monsoon rain (e.g., Uttar Pradesh, Punjab).

(iv) Semi-arid: These areas have low rainfall (300-750 mm) with very hot summers and mild winters (e.g., Rajasthan, Gujarat).

(v) Arid or Dry Desert: This zone receives very little rainfall (less than 250 mm) and experiences extreme heat during the day, reaching up to 50 degrees Celsius (e.g., Thar Desert).

(vi) Montane (Alpines): This climate is cold most of the year due to high altitude, featuring cool summers and snow in the winter (e.g., Himalayan region).