1902. The most abundant gas emitted from volcanoes is:

A. Nitrogen
B. Sulfur dioxide
C. Helium
D. Carbon dioxide
✅ The correct answer is option E.
Volcanoes also give off greenhouse gases. The most abundant gas released from volcanic eruptions is water vapour. Other emitted gases include carbon dioxide (CO2), sulfur dioxide (SO2), hydrogen sulfide (H2S), carbon monoxide (CO), hydrogen chloride (HCl), and hydrogen fluoride (HF).

1903. The main atmospheric layer near the surface of earth is

A. troposphere
B. mesophere
C. ionosphere
D. stratosphere
✅ The correct answer is option A.
The atmosphere has 4 layers: the troposphere that we live in near the surface of the earth; the stratosphere that houses the ozone layer; the mesosphere, a colder and lower density layer with about 0.1% of the atmosphere; and the thermosphere, the top layer, where the air is hot but very thin.

1904. Ecology deals with the study of:

A. Living beings
B. Living and non living components
C. Reciprocal relationship between living and non living components
D. Environment
✅ The correct answer is option C.
Ecology is the study of the relationships between living organisms, including humans, and their physical environment; it seeks to understand the vital connections between plants and animals and the world around them.

1905. Green revolution is associated with _________

A. sericulture
B. agriculture
C. fish culture
D. silviculture
✅ The correct answer is option B.
The Green Revolution in India refers to a period of time when agriculture in India changed to an industrial system due to the adoption of modern methods and technology such as high yielding variety (HYV) seeds, tractors, pump sets, etc. Green revolution was started by Dr. M.S. Swaminathan.

1906. Autotrophs are ______________

A. Consumers
B. Herbivores
C. Saprophytes
D. Producers
✅ The correct answer is option D.
An autotroph or primary producer is an organism that produces complex organic compounds using carbon from simple substances such as carbon dioxide, generally using energy from light or inorganic chemical reactions.

1907. Which of the following helps to explain why even though northern latitudes experience 24 hours of sunlight on June 22, they are not warmer than latitudes further south?

A. Solar energy is spread over a larger area in northern latitudes
B. Some of the sun’s energy is reflected by snow and ice in the northern latitudes
C. Increased cloud cover reflects solar energy in the northern latitudes
D. Solar energy is used to melt frozen soil in the northern latitudes
✅ The correct answer is option E.
All of the above

1909. At middle latitudes, the base of an altostratus or altocumulus cloud would generally be found between:

A. 200 and 6,500 feet
B. 6,500 and 23,000 feet
C. 23,000 and 43,000 feet
D. Above 43,000 feet
✅ The correct answer is option B.
At middle latitudes, the base of an altostratus or altocumulus cloud would generally be found between: 6,500 and 23,000 feet.