A. How is natural rubber obtained? Why is it so important?
B. Compare the geographical conditions for growing of rice and wheat.
C. What are the advantages and disadvantages of subsistence farming?
D. Describe the positive results of the Green Revolution.
Answers
Answer:
Q D Ans: Green revolution
Explanation:
Is carbon dioxide is nice air to breath
Answer:
A ans Hevea Brasiliensis: ↑ It is a tree native to the Amazon. It is economically very important because the latex collected from the tree is the primary source of natural rubber. Vulcanization: ↑ Process of treating rubber with sulfur and heat, to harden it while keeping its elasticity.
B ans Temperature of Rice and wheat - Rice grows in the temperature of 20-degree centigrade to 27- degree centigrade and Wheat is needed 15.5-degree centigrade. Rain-fall of Rice and Wheat - Rice requires abundant rainfall. Minimum 115 cm rainfall is required for paddy and Wheat requires 38 cm to 80 cm rainfall.
C ans Another disadvantage of subsistence farming is that the farmers cannot take advantage of an increased demand for their produce. The reason is that they can only produce so much and therefore even if the demand for their product increases, they cannot take advantage of it. Their output is constantly low.
D ans GR has been able to save the lives of millions of people and exponentially increase the yield of food crops. It improved the economic lot of farmers, and their standard of living greatly improved. It reduced the import of food grains. The revolution increased the use of fertilizers
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