Lak B Our Environment
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Lak B Our Environment

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50 Qs

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As a biologist, if you become very interested in the study of the interaction of organisms with each other and the environment your subspecialty would be

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As energy is passed from one trophic level to another, the amount of usable energy

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An example of a producer in the aquatic food web would be

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Free services provided to humans by ecosystems include

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Each step in a food chain is called a

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absorbs some of the ....... that radiates from the surface of Earth to space

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Why do scientists think that human-induced global warming will be more harmful to plants and animals than were past, natural climate fluctuations?

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The biological process by which carbon is returned to its reservoir is

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How do mountain ranges create deserts

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Individuals of any species at a place from

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The part of earth comprising water is called an

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The last chain of food is

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Trophic levels are formed by-

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In an ecosystem green plants are known as

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Sun gives radiation in the form of

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Sulphur dioxide affects

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For corrosion of metals, there should be

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The maximum energy is stored at following trophical level in any ecosystem

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In an ecosystem the function of the producers is to

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In order to maintain proper ecological balance

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Pyramid of energy in a forest ecosystem is

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The biotic and abiotic components interacting with each other in a pond form

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Ozone layer is essential because it absorbs most of the 

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Acid rain is due to

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Acid rain is the downpour of

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Which of the following does not affect ozone layer

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Which of the following does not form part of particulate matter?

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Select the most dangerous pollutant

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The presence of which of the following pollutants in the atmosphere has caused damage of Taj Mahal?

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Among the most dangerous non-biodegradable waste is

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The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about

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In an ecosystem, the 10% of energy is transferred from one trophic level to the next in the form of

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Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

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What will happen if deer is missing in the food chain given below?
$$Grass\rightarrow Deer\rightarrow Tiger

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The decomposers in an ecosystem

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Environment consists of

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City garbage can be used to produce

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Carnivores represent

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Which one is recyclable waste?

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Rag pickers remove

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Carcinogenic chemicals produced during recycling of plastics and polythene are

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Who coined the term ecosystem?

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In every food chain green plant are

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Which one is present in maximum number in an ecosystem?

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Organisation involved in formulating programmes for protecting environment is

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World environment day is celebrated on

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Habitat together with functions of species constitute is

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Plants are killed in winter by frost ____________________.

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It is said, the Tajmahal may be destroyed due to

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Carbon monoxide is a pollutant because

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Fill in the Blanks

29 Qs

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The contamination of air by adding gases, smoke and ash is called .......

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Burning of fossil fuels is the main cause of release of ______ dioxide gas in air.

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It is ....... to sleep in closed room with a coke fire burning.

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Excess presence of ....... and ....... gases may cause acid rain.

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The use of chemicals like CFCs has endangered the ....... layer.

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The waste we generate may be ....... or .......

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________ is defined as sum total of all conditions and influences that affect the life of organisms.

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Substances that are broken-down by biological processes are said to be _________.

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All the interacting organisms in an area together with the non-living constituents of the environment form an .......

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Gardens and crop fields are example of ______ecosystem.

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Organisms can be grouped as producers, consumers and _____ according to the manner in which they obtain their substance from the environment.

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The decomposers comprising microorganisms like Bacteria and ______.

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The materials which are locked up in dead complex organic substance are made available to plants in the form of simple inorganic substances by the .......

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Every food chain starts from _________.

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The flow of energy is always _______ in food chains.

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The interlocking pattern of various food chains is referred as Food _______.

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The disposal of the waste we generate is causing serious ....... problems.

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Total number of individuals of any species at a place is known as .......

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All the ecosystem taken together in a geographical area form a bigger unit is known as ________.

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The sequential process of one organism consuming the other forms a ______.

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The two important functions that food chains depicts are transfer of ....... and .......

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The plants trap ....... energy and convert it into ....... energy.

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The energy available at each successive trophic level is ....... of the previous level.

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In an ecological pyramid, the base represents ....... level.

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In nature, all green plants are ....... whereas animals are consumers.

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Nitrogen-fixing bacteria live in nodules on the roots of ....... plants.

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Nitrates and nitrites present in the soil are changed into ....... by micro-organisms.

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The increased nitrogen in rivers and lakes boosts the growth of ....... and other phytoplankton at the cost of other aquatic organisms.

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Decrease in ozone in stratosphere is linked to release of synthetic chemicals like .......

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True / False

25 Qs

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Waste are of two types, biodegradable and non-biodegradable.

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Non-biodegradable articles are the ones which cannot be decomposed.

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Ozone is formed in stratosphere by action of ultravoilet radiations on oxygen.

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Earth is kept warm due to green house flux.

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Rag pickers remove reusable or recyclable articles.

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Biodegradable wastes should be separated and kept in blue colour bins for garbage collectors.

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Food web ensures survival of all types of trophic levels.

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Blue green algae are producers.

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The reproduction and other activities of living organisms are affected by the abiotic components of ecosystem.

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All materials are not recycled in the environment.

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Specific enzymes are needed for the break-down of a particular substance.

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The materials like plastics are not acted upon by physical process.

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The energy flows from autotroph to the heterotrophs.

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Secondary consumers in a food chain are always carnivores.

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The interlocking pattern of various food chains is referred as food web.

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Carbon dioxide causes depletion of ozone layer thereby allowing more UV-radiations to reach the earth.

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Organisms can make organic compounds from inorganic substance by using the radiant energy of the sun in the presence of chlorophyll.

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Ecology is the scientific study of the interaction of organisms with each other and the environment.

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The abiotic components of the environment are the living factors.

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An ecosystem is made up of one type of community.

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In general, food webs consist of producers, consumers, and decomposers.

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The amount of usable energy remains constant as it is passed from one trophic level to another.

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The energy within an ecosystem is fixed and never changes.

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Human population and technology are having a destructive impact on the biosphere

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The oxides of nitrogen and sulfur, when mixed with water in the air, are the chief components of acid rain.

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