Answer : B
Earlier earth was considered to be at the center and all celestial bodies move around it. But later on Nicholas Copernicus proposed another model called ‘Heliocentric model’ where sun was placed at the center and all the celestial bodies including the earth revolve around it.
Answer : B
Answer : D
Answer : B
The Sun travelling at a speed of 250 km per second (9 lakh km/h) takes about 225 million years to complete one revolution around the Milky Way. This period is called a cosmic year.
Answer : A
Answer : D
There is a large gap in between the orbits of Mars and Jupiter. This gap is occupied by a broad belt containing about half a million pieces of rocks that were left over when the planets were formed and now revolve around the Sun. These are called asteroids. The biggest asteroid is Ceres – 946 km across. Every 50 million years, the Earth is hit by an asteroid nearing 10 km across. Asteroids can only be seen through large telescope.
Answer : D
Answer : A
The most popular argument regarding the origin of the universe is the Big Bang Theory. It is propounded by Abbe Georges Lemaitre in 1927, a Belgian astronomer.
Answer : C
About January 3rd the earth is closest to the sun, and it is said to be at Perihelion. Around July 4th the earth is farthest from the sun, and it is said to be at Aphelion
Answer : C
Answer : A
Succession often involves a progression from communities with lower species diversity—which may be less stable—to communities with higher species diversity—which may be more stable
Answer : A
Answer :C
Answer : C
These countries are Bolivia, Brazil, China, Colombia, Costa Rica, Democratic Republic of Congo, Ecuador, India, Indonesia, Kenya, Madagascar, Malaysia, Mexico, Peru, Philippines, South Africa and Venezuela. The LMMC Group, which holds more than 70% of all biodiversity, and 45% of the world’s population, is now well recognized as an important negotiating block in the UN and other international fora. Guatemala and Iran also joined
Answer : D
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