1546: Consider the following statements:
1. The Earth's magnetic field has reversed every few hundred thousand years.
2. When the Earth was created more than 4000 million years ago, there was 54% oxygen and no carbon dioxide.
3. When living organisms originated, they modified the early atmosphere of the Earth.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
1547: Inflation tends to reduce the share of labour in the GNP (Gross National Product) because
(a) Wages lag behind prices
(b) Prices lag behind wages
(c) Profits lag behind prices
(d) Profits lag behind wages
1548: Which one of the following areas of India produces largest amount of cotton ?
(a) North-western India and Gangetic West Bengal
(b) North-western and Western India
(c) Western and Southern India
(d) Plains of Northern India
1549: Which one of the following types of erosion is responsible for the formation of Chambal Ravines ?
(a) Splash
(b) Sheet
(c) Rill
(d) Gully
1550: Which one of the following is the best description of the term 'ecosystem'?
(a) A community of organisms interacting with one another.
(b) That part of the Earth which is inhabited by living organisms.
(c) A community of organisms together with the environment in which they live
(d) The flora and fauna of a geographical area