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Subject:

geography

Class:

class VII

Key Concepts

components of air, greenhouse effect, global warming, layers of atmosphere, weather and climate, temperature Air pressure, pressure belts, wind system, types of rain

essential questions

1.What would happen if atmospheric blanket was missing from earth?
2. If man colonizes on moon, how will he survive the absence of the atmospheric blanket present on earth?
3. Why are plants very important for the life on earth as it exist today?

Remembering:

  1. Which gas released in the atmosphere creates a greenhouse effect in trapping the heat: a) carbon di oxide  b) Oxygen c) Nitrogen  d) All of these
  2. Excess amount of Carbon dioxide is responsible for: a) global cooling  b) global warming  c) a and b  d) none
  3. Which is the most important layer of the atmosphere? a) Troposphere  b) Thermosphere c) Mesosphere  d) None
  4. Stratosphere contains a layer of which gas: a) Nitrogen  b) Ozone c) Helium d) None
  5. In which layer all weather phenomenon occurs? a) Troposphere  b) Stratosphere  c) Thermosphere  d) Mesosphere
  6. In which direction the wind blows constantly throughout the year in particular direction a) Permanent winds  b) Local winds  c) seasonal winds  d) a and b
  7. Which one of this is a local wind: a) sea breeze  b) monsoon winds  c) trade winds  d) none
  8. Which of the following gases protects us from harmful sun rays? a) carbon dioxide  b) Nitrogen  c) Ozone  d) all of these
  9. The incoming energy intercepted by the earth is termed as: a) solar energy  b) sun rays  c) radiation  d) Insolation
  10. The hot and dry local wind in Northern Plains of India: a) land breeze  b) Hot breeze  c) Loo d) Monsoon
  11. This gas ii important for survival of plants and they cannot take it via photosynthesis; a) Oxygen  b) carbondioxide  c) Argon  d) Nitrogen
  12. Troposphere average height is : a) 31Km  b) 33Km  c) 13 km  d) 23 km

understanding:

  1. What is the result when the air is heated: a) heavier  b) Lighter  c) colder d) warmer
  2. As we go up in the layers of the atmosphere what is the effect in the pressure: a) increase  b) decrease c) remains the same d) None
  3. Which of the following layers of the atmosphere is free from clouds? a) mesosphere, troposphere   b) troposphere, stratosphere  c) stratosphere, mesosphere

Application:

  1. Average weather condition of the place for a longer period of time is known as: a) temperature  b) Humidity  c) altitude  d) climate
  2. How does our body react to air pressure: a) It is not affected at all b) get squeezed  c) gets flattened  d) exerts a counter pressure

Analysis:

Evaluation:

  1. Assertion A: Insolation is dependent on the distance traveled by sun’s rays entering the earth. Reason R: Thus more distance traveled by the sun rays the heat decreases.

a) Both A and R are true and R is the correct explanation of A. b) Both A and R are true but R is not correct explanation of A. c) A is true but R is false  d) A is false but R is true.

2. Assertion A: The meteorites entering the earth’s atmosphere start burning in the mesosphere. Reason R: The thin layer of air which is present here brings friction thus heating up the meteorite to burn up.

a) Both A and R are true and R is the correct explanation of A. b) Both A and R are true but R is not correct explanation of A. c) A is true but R is false  d) A is false but R is true.

3. Assertion A: Convectional rainfall occurs when air warms up and condenses when it reaches  higher heights, rainfall happens. Reason R: These rains are happen near the equatorial region.

a) Both A and R are true and R is the correct explanation of A. b) Both A and R are true but R is not correct explanation of A. c) A is true but R is false  d) A is false but R is true.

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