Que- 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
Answer- South
Explanation- 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.
Que- Nitrogen fixing blue green algae is
a. Clostridium
b. Rhizobium
c. Nostoc
d. Nitrosomonas
Answer- Nostoc
Explanation- Nitrogen fixing blue green algae is Nostoc.
Que- Area X represents
a. coal
b. solar
c. nuclear
d. oil
Answer- coal
Explanation- Area X represents coal.
Que- A renewable source of energy is
a. Petroleum
b. Coal
c. Nuclear fuel
d. Trees
Answer- Trees
Explanation- A renewable source of energy is trees.
Que- The slow rate of decomposition of fallen logs in nature is due to their
a. poor nitrogen content
b. low moisture content
c. low cellulose content
d. anaerobic environment around them
Answer- low moisture content
Explanation- The microorganisms breakdown the complex compounds of dead protoplasm of producers and consumers absorb some of the decomposition products and release simple substances. The slow rate of decomposition of fallen logs in nature is due to their low moisture content The cellulose is in high amount in fallen logs.
Que- A high Biological Oxygen Demand (BOD) indicates that:
a. water is pure
b. absence of microbial action
c. Low level of microbial pollution
d. High level of microbial pollution
Answer- High level of microbial pollution
Explanation- A high BOD indicates the presence of a large number of microorganisms, which suggests a high level of pollution.
Que- Thorn-forests are found in the _______ regions.
a. semi-arid
b. high rain fall areas
c. low temperature
d. frozen areas
Answer- semi-arid
Explanation- This type of vegetation is found in the north-western part of the country including semi-arid areas of Gujarat,Rajasthan, Madhya Pradesh, Chhattisgarh, Uttar Pradesh and Haryana. Acacias, palms, euphorbias and cacti are the main plant species.
Que- Green plants are absent in deep sea. Why?
a. Light is absent
b. High pressure
c. Low temperature
d. Great depth
Answer- Light is absent
Explanation- Green plants are not found beyond a certain depth in the ocean because light can not penetrate deep into the ocean so, no producers are found in that zone as in the absence of sunlight green plants will not be able to produce food by photosynthesis.
Que- Euro II standard refers to _________
a. Lowering sulfur content in fuel
b. Increasing sulfur content in fuel
c. Lowering carbon content in fuel
d. increasing carbon content in fuel
Answer- Lowering carbon content in fuel
Explanation- Euro II standard refers to lowering carbon content in fuel.
Que- Particulate pollutants are
a. are small solid particles and liquid droplets
b. liquid droplets in atmosphere
c. are small solid particles released into the atmosphere
d. all of these
Answer- are small solid particles and liquid droplets
Explanation- Particulate matter contains microscopic solids or liquid droplets that are so small that they can be inhaled and cause serious health problems. Some particles less than 10 micrometers in diameter can get deep into your lungs and some may even get into your bloodstream.
Que- Which of the following gases has role an important in maintaining atmospheric temperature?
a. Nitrogen
b. Oxygen
c. Argon
d. Carbon dioxide
Answer- Carbon dioxide
Explanation- Carbon dioxide is an important greenhouse gas that helps to trap heat in our atmosphere. Without it, our planet would be inhospitably cold. However, a gradual increase in CO 2 concentrations in Earth's atmosphere is helping to drive global warming, threatening to disrupt our planet's climate as average global temperatures gradually rise.
Que- Harmful trace metals in fly ash:
a. antimony
b. cadmium
c. arsenic
d. all of the above
Answer- all of the above
Explanation- Depending upon the source and composition of the coal being burned, the components of fly ash vary considerably, but all fly ash includes substantial amounts of silicon dioxide (SiO2) (both amorphous and crystalline), aluminium oxide (Al2O3) and calcium oxide (CaO), the main mineral compounds in coal-bearing rock strata.
Que- The term Ecosystem was coined by
a. Odum
b. Clements
c. Arthur G Tansley
d. Elton
Answer- Arthur G Tansley
Explanation- The term ecosystem was first used in 1935 in a publication by British ecologist Arthur Tansley. Tansley devised the concept to draw attention to the importance of transfers of materials between organisms and their environment.
Que- _________ ecosystems are maintained artificially by man.
a. Man-made
b. Marine
c. Artificial
d. Brackish
Answer- Man-made
Explanation- Artificial ecosystems are maintained artificially by man. A pond constructed as a part of wastewater treatment plant is an example of artificial ecosystem. In these types of ecosystem, the only source of power is solar energy.
Que- Environmental education should be in _______ approach.
a. interdependent
b. interpreting
c. interdisciplinary
d. balanced
Answer- interdisciplinary
Explanation- Environmental education should be in interdisciplinary approach.
Que- A high density of elephant population in an area can result in
a. mutualism
b. Intraspecific competition
c. Interspecific competition
d. Predation on one another
Answer- Intraspecific competition
Explanation- A high density of elephant population in an area can result in intraspecific competition.
Que- The most important human activity, leading to the extinction of wildlife, is
a. Pollution of wildlife, is
b. Hunting for valuable wildlife products
c. Introduction of alien species
d. Alternation and destruction of the natural habitats
Answer- Alternation and destruction of the natural habitats
Explanation- Habitat loss and fragmentation is the most important cause driving animals and plants to extinction.
Que- The process of successful establishment of the species in a new area is called
a. sere
b. climax
c. invasion
d. ecesis
Answer- ecesis
Explanation- The process of successful establishment of the species in a new area is called ecesis.
Que- The order of basic processes involved in succession is
a. Nudation->Invasion-> competition and co action->reaction>stabilization
b. Nudation->stabilization-> competition and co action->Invasion>reaction
c. Invasion-> Nudation->competition and co action->Reaction>stabilization
d. Invasion->stabilization-> competition and co action->Reaction>nudation
Answer- Nudation->Invasion-> competition and co action->reaction>stabilization
Explanation- Nudation->Invasion-> competition and co action->reaction>stabilization
Que- What is meant by ex-situ conservation?
a. Conservation of a species by protecting its habitat along with all other species living there
b. Conservation of forest eco system
c. Conservation of a species outside its natural habitat
d. Conservation of plants
Answer- Conservation of a species outside its natural habitat
Explanation- Conservation of a species outside its natural habitat.
Que- Earth summit of Rio de Janeiro (1992) resulted in
a. Compilation of Red list
b. Establishment of biosphere reserves
c. Conservation of biodiversity
d. IUCN
Answer- Conservation of biodiversity
Explanation- The Earth Summit of Rio de Janeiro, also known as the United Nations Conference on Environment and Development (UNCED), was held in Rio de Janeiro from 3 to 14 June 1992. It resulted in the Convention on Biodiversity, a multilateral treaty.
Que- Photosynthesis is found in
a. Producers
b. Decomposers
c. Consumers
d. Scavengers
Answer- Producers
Explanation- In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.
Que- Organisms which depend on Producers for nutrition are called
a. Autotrophs
b. Saprophytes
c. Consumers
d. Xerophytes
Answer- Consumers
Explanation- Organisms are characterized into two broad categories based upon how they obtain their energy and nutrients: autotrophs and heterotrophs. Autotrophs are known as producers because they are able to make their own food from raw materials and energy. Examples include plants, algae, and some types of bacteria. Organisms which depend on Producers for nutrition are called heterotrophs or consumers.
Que- Phytoplankton are
a. Producers of forest
b. Producers of lakes
c. Consumers of Ocean
d. Omnivores
Answer- Producers of lakes
Explanation- Phytoplankton are producers of lakes.
Que- Two objects, A and B, have the same mass but the specific heat of A is larger than B. If both objects absorb equal amounts of energy,
a. A will become warmer than B
b. B will become warmer than A
c. Both A and B will warm at the same rate
d. A will get warmer, but B will get colder
Answer- B will become warmer than A
Explanation- B will become warmer than A.