B. Answer the following questions in brief:
1. State any two uses of fire in the Old Stone Age.
2. How do skeletal studies helps to identify gender differences.
3. Mention the advantages of a map.
4. What is Saptarishi Mandal?
5. Name the main factors responsible for green revolution in India.
Answers
Answer:
1 : Use no 1 - they used fire to keep themselves warm at night . Use no 2 - They used fire to roast meat . Use no 3 - They used fire to see at night
2 : The biological sex of an adult can be determined with 95% accuracy by measuring the hip bone alone . 83% accuracy by the skull and 80% accuracy by the long bones.
3 : Maps are easier to use and easy to carry around , they can show earth's entire surface or just a small part and can even show a small locality in a great detail.
4 : The saptarishi are the seven rishis who are extolled at many places in the Vedas and in Hindu literature.
5 : The green revolution thereby was intended to over food shortages in India by increasing the yields of agricultural produce with the help of better irrigation system , pesticides , fertilizers , agricultural machinery etc.