Que- Which one of the following is the most stable ecosystem?
a. Forest
b. Mountain
c. Desert
d. Ocean
Answer- Ocean
Explanation- An ecosystem is said to be stable when it's structure and function remains constant for a long period of time. Among the given options, most stable ecosystem is ocean. The first reason for its stability is it's chemical composition which includes saline.
Que- The type of ecosystem with the highest mean plant productivity is
a. tropical rain forest
b. temperate grassland
c. desert
d. tundra
Answer- tropical rain forest
Explanation- 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.
Que- Carbon sequestration is a strategy used to control
a. pollution
b. population explosion
c. desertification
d. global warming
Answer- global warming
Explanation- 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.
Que- Wild life is continuously decreasing. What is the main reason of this?
a. Predation
b. Cutting down of forest
c. Destruction of habitat
d. Hunting
Answer- Destruction of habitat
Explanation- The reasons are deforestation, pollution, killing, over exploitation etc. The most important among them is deforestation or destruction of their natural habitat because it will affect the species (flora and fauna) of complete area and not only the few organisms.
Que- Water heats up ______ and cools off _____ than land.
a. More quickly, more quickly
b. More quickly, more slowly
c. More slowly, more quickly
d. More slowly, more slowly
Answer- More slowly, more slowly
Explanation- Water heats up more slowly and cools off more slowly than land.
Que- In July, at middle latitudes in the Northern Hemisphere, the day is ____ long and is ____ with each passing day.
a. Less than 12 hours; getting longer
b. Less than 12 hours; getting shorter
c. More than 12 hours; getting longer
d. More than 12 hours; getting shorter
Answer- More than 12 hours; getting shorter
Explanation- In July, at middle latitudes in the Northern Hemisphere, the day is more than 12 hours long and is getting shorter with each passing day.
Que- The effect of interspecific competition on niches is to make them
a. larger
b. smaller
c. more triangular
d. change location
Answer- smaller
Explanation- The effect of interspecific competition on niches is to make them smaller.
Que- The carrying capacity of a population is determined by its
a. population growth rate
b. natality
c. mortality
d. limiting resources
Answer- limiting resources
Explanation- The carrying capacity of a population is determined by its limiting resources.
Que- The order of succession in a lithosere or xerosere is
a. Foliose lichen stage->Crustose lichen stage->moss stage->herb stage>shrub stage->forest stage (climax community)
b. Crustose lichen stage->Foilose lichen stage->moss stage->herb stage>shrub stage->forest stage (climax community)
c. Moss stage ->Foilose lichen stage-> Crustose lichen stage ->herb stage->shrub stage->forest stage (climax community)
d. Crustose lichen stage->Foilose lichen stage->moss stage-> ->shrub stage-> herb stage->forest stage (climax community)
Answer- Crustose lichen stage->Foilose lichen stage->moss stage->herb stage>shrub stage->forest stage (climax community)
Explanation- Crustose lichen stage->Foilose lichen stage->moss stage->herb stage>shrub stage->forest stage (climax community).
Que- Which of the following green house gases trap more heat?
a. Methane
b. Nitrous oxide
c. Carbon dioxide
d. Trifluoro methyl sulphurpentafluoride
Answer- Trifluoro methyl sulphurpentafluoride
Explanation- Trifluoro methyl sulphurpentafluoride trap more heat.
Que- The most abundant gas in the stratosphere is:
a. Oxygen (O2)
b. Nitrogen (N2)
c. Carbon dioxide (CO2)
d. Ozone (O3)
Answer- Nitrogen (N2)
Explanation- The atmosphere contains many gases, most in small amounts, including some pollutants and greenhouse gases. The most abundant gas in the atmosphere is nitrogen, with oxygen second. Argon, an inert gas, is the third most abundant gas in the atmosphere.
Que- Acid rain mainly result from
a. Sulfur dioxide
b. Carbon dioxide
c. Carbon monoxide
d. Ammonia
Answer- Sulfur dioxide
Explanation- Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids. ... Nitrogen oxides can also be produced naturally by lightning strikes, and sulfur dioxide is produced by volcanic eruptions.
Que- Animals that feed only on plants are called
a. detritivores
b. herbivores
c. carnivores
d. omnivores
Answer- herbivores
Explanation- Animals that eat only plants are called herbivores (or primary consumers). Animals that eat other animals are called carnivores.
Que- The first trophic level in a food chain
a. Green Plants
b. Herbivores
c. Carnivores
d. Bacteria
Answer- Green Plants
Explanation- The first trophic level of the food chain is always occupied by green plants which are termed to be producers. This is because producers absorb sunlight, abiotic factor and fix it into food chain. This energy is transferred to organisms in other trophic levels of the food chain.
Que- Climate includes
a. Seasonal variation
b. General patterns of atmosphere conditions
c. Average weather of an area
d. All of these
Answer- All of these
Explanation- Climate change is any systematic change in the long-term statistics of climate variables such as temperature, precipitation, pressure, or wind sustained over several decades or longer.
Que- An example of nitrogen fixing bacteria in the soil
a. Rhizobium
b. Nostoc
c. Azotobacter
d. Nitrobacter
Answer- Azotobacter
Explanation- Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular slime. They are aerobic, free-living soil microbes which play an important role in the nitrogen cycle in nature, binding atmospheric nitrogen, which is inaccessible to plants, and releasing it in the form of ammonium ions into the soil (nitrogen fixation).
Que- In a food chain of grassland ecosystem the top consumers are
a. Herbivorous
b. Carnivorous
c. Bacteria
d. Either carnivorous or herbivorous
Answer- Carnivorous
Explanation- The main reason why in a food chain of the grassland ecosystem, the top consumers are carnivorous because they are not eaten by others.
Que- The algal booin often releases __________ in water
a. acidic
b. toxins
c. bacteria
d. virus
Answer- toxins
Explanation- A harmful algal bloom (HAB) contains organisms that can severely lower oxygen levels in natural waters, killing marine life. Some HABs are associated with algae-produced toxins.
Que- The first protected area in India is ____________
a. Silent valley
b. Corbett National Park
c. Bandipur sanctuary
d. Nagar-Hole
Answer- Corbett National Park
Explanation- The first wildlife reserve of India, Jim Corbett National Park or 'Corbett Tiger Reserve' is situated in the Nainital district of Uttarakhand. It covers 1318 sq km of area, in which 500 sq. km is the core area and rest part is the buffer zone.
Que- The most abundant greenhouse gas in the earth's atmosphere:
a. Carbon dioxide (CO2)
b. Nitrous oxide (N2O)
c. Water vapour (H2O)
d. Methane (CH4)
Answer- Water vapour (H2O)
Explanation- Water vapour (H2O) is the most abundant greenhouse gas in the earth's atmosphere.
Que- Frost forms when:
a. Objects on the ground cool below the dew point temperature.
b. The dew point is 32oF or below.
c. Water vapor changes into ice without first becoming a liquid.
d. All of the above
Answer- All of the above
Explanation- Frost forms when an outside surface cools past the dew point. The dew point is the point where the air gets so cold, the water vapour in the atmosphere turns into liquid.
Que- A narrow valley with steep sides is known as
a. Gorge
b. Canyon
c. Waterfall
d. Landslide
Answer- Gorge
Explanation- A narrow valley with steep sides is known as Gorge.
Que- The temperature to which air must be cooled in order to become saturated is the:
a. Minimum temperature
b. Dew point temperature
c. Wet-bulb temperature
d. Freezing point
Answer- Dew point temperature
Explanation- The dew point is the temperature to which air must be cooled to become saturated without changing the pressure.
Que- The lowest temperature that can be attained by evaporating water into the air is known as the:
a. Heat index
b. Minimum temperature
c. Wet-bulb temperature
d. Frost point
Answer- Wet-bulb temperature
Explanation- The lowest temperature that can be attained by evaporating water into the air is the wet-bulb temperature.
Que- An example of an abiotic component
a. Plants
b. Soil
c. Animals
d. Bacteria
Answer- Soil
Explanation- Soil is often considered an abiotic factor since it is mostly made up of small particles of rock (sand and clay) mixed with decomposed plants and animals. Plants use their roots to get water and nutrients from the soil.