1951. India is primary centre of domestication of

A. Sheep
B. Goat
C. Water Buffalo
D. Elephants
✅ The correct answer is option C.
Vavilov centers are regions where a high genetic diversity can be found, representing the natural relatives of domesticated crop plants or animals. These areas are also called the primary areas of domestication. India is a primary center of domestication of Water Buffalo.

1952. The type of ecosystem with the highest mean plant productivity is

A. tropical rain forest
B. temperate grassland
C. desert
D. tundra
✅ The correct answer is option A.
Aquatic environments, such as coral reefs, estuaries, swamps and marshes, and terrestrial environments, including tropical rainforests, tropical seasonal forests, temperate evergreen forests, and temperate deciduous forests have the highest levels of primary productivity.

1953. Carbon sequestration is a strategy used to control

A. pollution
B. population explosion
C. desertification
D. global warming
✅ The correct answer is option D.
Carbon sequestration describes long-term storage of carbon dioxide or other forms of carbon to either mitigate or defer global warming and avoid dangerous climate change. It has been proposed as a way to slow the atmospheric and marine accumulation of greenhouse gases, which are released by burning fossil fuels.

1954. Ozone hole was first discovered in

A. Africa
B. Antarctica
C. India
D. Europe
✅ The correct answer is option B.
The discovery of the annual depletion of ozone above the Antarctic was first announced in a paper by Joe Farman, Brian Gardiner and Jonathan Shanklin which appeared in Nature in May 1985. Later, NASA scientists re-analyzed their satellite data and found that the whole of the Antarctic was affected.

1955. BOD stands for

A. Biological Oxygen Decrease
B. Biotic Oxygen Demand
C. Biological Oxygen Demand
D. None of the above
✅ The correct answer is option C.
BOD stands for Biological Oxygen Demand. It is the amount of dissolved oxygen required by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.

1956. Two-thirds of the world’s known oil reserves are located in

A. Siberia
B. Gulf of mexico and caribbean
C. The middle east
D. Indonesia
✅ The correct answer is option C.
Addressing a major energy conference organised by the Royal Institute of International Affairs (Chatham House) in central London, he said about two-thirds of the world proven oil reserves are located in the Middle East.

1957. In the northern hemisphere, a solar panel should be placed on the side of the roof facing:

A. East
B. West
C. North
D. South
✅ The correct answer is option D.
The northern hemisphere, the general rule for solar panel placement is, solar panels should face true south (and in the southern, true north). Usually this is the best direction because solar panels will receive direct light throughout the day.

1958. According to the Stefan-Boltzmann law, the radiative energy emitted by one square meter of an object is equal to a constant multiplied by its temperature raised to the _______ power.

A. Negative third
B. Zeroeth
C. Fourth
D. Tenth
✅ The correct answer is option C.
According to the Stefan-Boltzmann law, the radiative energy emitted by one square meter of an object is equal to a constant multiplied by its temperature raised to the fourth power.

1959. Superbugs are

A. Synthetic bug
B. Bacteria
C. Radio nucleotide
D. Industries
✅ The correct answer is option B.
Superbugs are strains of bacteria that are resistant to several types of antibiotics. Each year these drug-resistant bacteria infect more than 2 million people nationwide and kill at least 23,000, according to the U.S. Centers for Disease Control and Prevention (CDC).

1960. In an oil trap formed by an anticline, __________ accumulates on top, __________ in the middle, and __________ at the bottom.

A. natural gas, oil, groundwater
B. ground water, oil, natural gas
C. oil, groundwater, natural gas
D. oil, natural gas, ground water
✅ The correct answer is option A.
In an oil trap formed by an anticline, natural gas accumulates on top, oil in the middle, and groundwater at the bottom.