CBSE Questions for Class 10 Biology Our Environment Quiz 8 - MCQExams.com

The trophic level of lion in a forest ecosystem is:
  • $$T_3$$
  • $$T_4$$
  • $$T_2$$
  • $$T_1$$
Living beings like plants and animals are called abiotic components of a habitat.
  • True
  • False
Which of the following is non-essential in an ecosystem:-
  • $$CO_2$$
  • Grass
  • Fungi
  • None of the above
The study of food chains and food webs is observed in the phenomenon known as
  • biological chain
  • ecosystem
  • biological magnification
  • energy flow
Assertion: Ozone is destroyed by CFCs in the upper stratosphere.
Reason: Ozone hole increases the amount of UV radiation reaching the earth.
  • Assertion and reason are correct , but the reasons is not the explanation for the assertion
  • Assertion is false, but the reason is correct
  • Assertion and reason are incorrect, Assertion and reason are both correct
  • And the reason is the correct explanation for the assertion
Find incorrect statement for non-biodegradable pollutants.
  • The non-biodegradable pollutants are decomposed by microbes.
  • They are degraded slowly.
  • They are often harmful.
  • DDT, BHC, plastics, broken glass are examples of non-biodegradable pollutants.
Earth is protected from UV-radiations by:
  • ozone layer
  • nitrogen layer
  • carbon dioxide
  • oxygen layer
Read the following statements and choose the correct set of option w.r.t. ecosystem.
I. Various ecosystems are interconnected by the flow of energy and the transfer of materials.
II. It is a self-sustained and self-regulated segment of nature.
III. Energy flow is always cyclic while the flow of nutrients is unidirectional.
IV. Density of the ecosystem is governed by the degree of biogeochemical cycling and the amount of nutrients.
  • I, II and IV are correct
  • I, II and III are correct
  • Only III is are correct
  • III and IV are correct
The producers derive energy either from sunlight or
  • Organic compounds
  • Inorganic compounds
  • Grass
  • Nutrient cycle
Which organisms are dependent on the producers for their food ?
  • Autotrophic organisms
  • Heterotrophic organisms
  • Primary producers
  • Both a and c
Example of biotic factors includes:
  • Water
  • Sunlight
  • Oxygen
  • Grass
Various steps in a food chain represent:
  • Food web
  • Trophic level
  • Ecosystem
  • Biomagnification
Green plants belong to:
  • Second trophic level 
  • First trophic level 
  • Third trophic level 
  • Fourth trophic level
Choose the set that represents only the biotic components of a habitat. 
  • Tiger, Deer. Grass, Soil
  • Rocks, Soil, Plants, Air
  • Sand, Turtle, Crab, Rocks
  • Aquatic plant, Fish, Frog, Insect
Write true or false for the following statement.
The green plants capture about 10% of the energy of sunlight that falls on their leaves and convert it into food energy.
  • True
  • False
In Ozone, number of Oxygen atoms are:
  • 3
  • 2
  • 1
  • 4
 The vast surface of the earth presents a huge variety of conditions prevailing in different parts.
Choose the correct option for the given statement.
  • True
  • False
  • Ambiguous
  • Data insufficient
What are the biotic factors in this image?
Africa's Elephants Are Two Different Species, and Both Are Endangered - EcoWatch
  • Elephant, clods and air
  • Elephant, soil and air
  • Elephant and plants
  • Elephant and sunlight
Which of the following do not undergo composting?
  • Colored paper
  • Kitchen waste
  • Plant wastes
  • Dung
Which of the following chemicals is/are depleting ozone layer?
  • CFC's and compounds of chlorine fume or halogen gas
  • Carbon dioxide and carbon monoxide
  • Hydrofluorocarbons
  • Both A and C
Consider the following statements:
(a) Wastes are of two types, biodegradable and non-biodegradable.
(b) Biodegradable wastes should be separated and kept in blue colour bins for garbage collectors.
(c) Ozone is formed in stratosphere by action of ultraviolet radiations on oxygen.
Which of the above statements are correct?
  • (a) and (b)
  • (b) and (c)
  • (a) and (c)
  • None of the above
Which one is not dangerous?
  • Bio-pollutants
  • Ozone layer
  • Nuclear blast
  • Deforestation
Which of the following does not belong to the group formed by the others?
Match the columns and find out the correct combination.
III
aDDTi$$CO_2$$
bPeroxyacetyl nitrates
iiSmog
cAcid rainiiiBiological magnification
dGlobal warmingiv$$SO_2$$
  • a- iv, b- iii, c- ii, d- i
  • a- i, b- iii, c- ii, d- iv
  • a- ii, b- iii, c- iv, d- i
  • a- iii, b- ii, c- iv, d- i
Concentration of DDT is highest in: 
  • Primary consumer
  • Producers
  • Top consumer
  • Decomposers
If the primary producers are absent from any ecosystem, which of the following will occur?
  • Herbivores will not be able to survive.
  • Carnivores will not be able to survive.
  • Both herbivores and carnivores will not be able to survive because of the absence of food.
  • No change will take place.
Which of these animals can occupy more than one trophic levels in the same ecosystem at the same time?
  • Goat
  • Frog
  • Birds
  • Lion
Which of the following is correct about a food chain and a food web?
  • A food chain is a series of organisms feeding on one another, a food web consists of a number of interlinked food chains.
  • A food chain is each step or level of a trophic level, a food web consists of a number of interlinked food chains.
  • A food chain is a series of animals feeding on each other, a food web consists of a number of interlinked trophic levels.
  • A food chain consists of a number of interlinked food webs, a food web consists of a series of organisms feeding on one another.
Each successive trophic level has
  • Less total energy
  • More total energy
  • Increased total energy
  • Non-estimated energy contents
Which of the following limits the number of trophic levels in an ecosystem?
  • The number of species
  • The population size
  • The loss of potential energy
  • The number of individuals
  • The hours of sunshine
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