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[Old] Social science 3 Marks Each

Environmental Changes · Gujarat Board (GSEB) STD 8 (GSEB - English Medium). 4 questions.

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4 questions · timed · auto-graded

Question 13 Marks
See the map of India given on page no. $37$ of the textbook . Think and write about the weather at different places in India.
Answer
It can be seen from the map that winter season prevails over India .
  • It is very cold in North India, while eastern and western India have mild cold and south India experiences the least cold.
  • Maximum temperature of $39^o$ $C$ is recorded at Dibrugarh.
  • Overall the sky is clear except in some parts of northern mountainous regions and West Bengal and Odisha where the sky is totally covered by clouds.
  • Rain is likely to occur in these regions,while there may be rain or snow in the Himalayan region.
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Question 23 Marks
State the reasons for increase in the amount of methane gas in the atmosphere . How much methane is added due to each reason ?
Answer
Major reasons for increase in the amount of methane $CH_4$ are :
Sr No Reason Release of methane gas
  1.  
 Exhaling of animals and metabolism process 14 crore tonnes
  1.  
 Paddy cultivation 15 crore tones
  1.  
 Decomposition of bio-degradable waste 7 crore tonnes
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Question 33 Marks
List down the home appliances of daily use that add to global warming.
Answer
Home appliances of daily use that add to global warming are televisions, air conditioners , tubelights, bulbs computers, laptops, refrigerators, geysers, heaters all types of vehicles like cars, buses, scooters etc.all kinds of phones ,electric motors, pumps, etc.
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Question 43 Marks
What do you mean by “Greenhouse Effect “ ?
Answer
Countries with cold climate receive less heat from the sun .
  • This hampers growth of palnts and vegetables.
  • Thus, arrangements are made to conserve heat by having a roof of glass or cloth to allow sunrays to reach inside and sustain heat which is created due to production of carbon dioxide and water vapour.
  • This is known as “ Greenhouse effect” and this type of farming is called “Greenhouse Farming”.
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3 Marks Each - [Old] Social science STD 8 Questions - Vidyadip