CBSE Questions for Class 10 Biology Our Environment Quiz 1 - MCQExams.com

Match the following:
List 1List 2
(a)Fourth trophic level(i)Snake
(b)Second trophic level(ii)Vulture
(c)First trophic level(iii)Rabbit
(d)Third trophic level(iv)Grass
  • (a) - (iii), (b) - (ii),  (c) - (i), (d) - (iv)
  • (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
  • (a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)
  • (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)
Ozone hole means
  • Hole in the stratosphere
  • Same concentration of ozone
  • Decrease in the concentration of ozone
  • Increase in the concentration of ozone
Food chain starts with
  • Nitrogen fixation
  • Excretion
  • Photosynthesis
  • Respiration
The first link in any food chain is always a green plant, because
  • They are widely distributed.
  • They are firmly fixed to the soil.
  • They alone have a capacity to fix atmospheric $$CO_2$$ in the presence of sunlight.
  • All of the above.
The transfer of energy from one organism to another organism in a natural community establishes:
  • Food chain
  • Biological magnification
  • Natural selection
  • All of the above
The consumers are
  • All plants
  • All animals
  • All microbes
  • None of the above
Energy and nutrients enter a community by 
  • Primary consumer
  • Producer
  • Decomposer
  • Sunlight
Which of the following belongs to the category of primary consumers?
  • Snakes
  • Water insects
  • Eagle 
  • Cattle
In an ecosystem
  • Cycling of energy and nutrients is a coupled process.
  • Cycling of energy is an independent process.
  • Movement of energy is unidirectional.
  • Movement of energy is bidirectional.
Ecosystem is defined as:
  • Relation between plants and animals
  • Relation between biotic and abiotic components
  • Relation between producers and decomposers
  • Relation between producers and consumers 
In an ecosystem, primary consumers are:
  • Carnivores
  • Herbivores
  • Decomposers
  • Producers
Each ecosystem consists of ........... main components.
  • Three
  • Two
  • Four
  • Five
UV radiation increases the chances of ________ .
  • skin cancer
  • lung cancer
  • both $$A$$ and $$B$$
  • none of the above
_____ are the cause of depletion of the atmospheric ozone layer.
  • Chlorofluorocarbons
  • $$CO_2$$
  • $$SO_2$$
  • none of the above
Which of the following is a biotic factor?
  • Light
  • Air
  • Parasite
  • Temperature
Plastic is one of the most harmful ______ waste.
  • Biodegradable 
  • Non-biodegradable
  • Biotic
  • Abiotic
Driving force for an ecosystem is the
  • Biomass
  • Producers
  • Food
  • Energy
Each step or level of the food chain forms a ________.
  • Food web 
  • Trophic level
  • Tropic level
  • Geographic level
Which is not a natural ecosystem?
  • Desert
  • Aquarium
  • Forest
  • All of the above
UNEP stands for
  • United Nations Ecotype Programme
  • United Nations Ecological Programme
  • United Nations Education Programme
  • United Nations Environment Programme
In a food chain, the herbivores are represented by 
  • Producers
  • Primary consumers
  • Secondary consumers
  • Decomposers
The ecosystem consists of only plants and animals.
  • True
  • False
_____________ feed on dead and decaying matter.
  • Autotrophs
  • Herbivores
  • Decomposers
  • Carnivores
The interlocking pattern of various food chains is referred as food web.
  • True
  • False
Trophic levels in a food chain are formed by:
  • Producers
  • Consumers
  • Decomposers
  • All of the above
Select the correct statement concerning food chains.
  • Removal of 80% tigers from an area resulted in greatly increased growth of vegetation.
  • Removal of most of the carnivores resulted in an increased population of vultures.
  • The length of food chains is generally limited to 3-5 trophic levels due to energy loss.
  • The length of food chains may vary from 2 to 8 throphic levels.
In a polluted environment, the maximum concentration of a pollutant will be found in:
  • Primary producers
  • Tertiary consumers
  • Secondary Consumers
  • Primary consumers
The term 'biomagnification' refers to the:
  • Growth of organism due to food consumption.
  • Increase in population size
  • Increase in biodiversity
  • Increase in the concentration of non-degradable pollutants as they pass through the food chain.
  • Decrease in population size
Formation of ozone hole is maximum over:
  • India
  • Antarctica
  • Europe
  • Africa
The presence of which of the following gases in air checks the ultraviolet rays from sunlight?
  • SO$$_{2}$$
  • CO$$_{2}$$
  • NO
  • O$$_{3}$$
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