CBSE Questions for Class 10 Biology Our Environment Quiz 5 - MCQExams.com

In the given food web, an insecticide is sprayed to kill the caterpillars. In which organisms will the highest level of insecticide accumulate after a period of time?
315932_2422986cf39d49d4b89fb3db1d8af81d.png
  • Foxes
  • Hawks
  • Mice
  • Sparrows
In a food chain, lions occupy which trophic level?
  • First
  • Second
  • Third
  • Both B and C
The Great Barrier Reef along east coast of Australia is 
  • a population
  • a community
  • a biome
  • an ecosystem
Read the following statements.
I.  In a food chain, there is a multidirectional flow of energy from the sun to producers, consumers, and decomposers.
II. Shorter food chains provide more energy as compared to longer food chains.
III. In an ecosystem, no food chain is independent.
IV. The energy available at each successive trophic level increases.
Which of these statements are correct?
  • I and II
  • II and III
  • III and IV
  • I and IV
Which one of the following is the correct definition of an ecosystem?
  • A localized association of several plants and animals
  • Community of plants, animals, and microbes, interacting with each other and their environment
  • Community of plants and microbes, plus their environment
  • A community of only organisms interacting with one another
Which among the following is an abiotic component in an ecosystem. 
  • Water
  • Fungi
  • Bacteria
  • Chlorella
Which one of the following animals is an omnivore?
  • Goat
  • Rabbit
  • Dog
  • Wolf
Organisms of the same trophic level are_________.
  • Deer and honey bee
  • Cheetah and grasshopper
  • Snake and earthworm
  • Crow and cow
In an ecosystem
  • Primary producers are more than that of primary consumers
  • Secondary consumers are largest, because they are powerful
  • Primary consumers are out of number
  • Primary consumers are least dependent upon primary producers
The given figure shows four food chains with humans as a top consumers. Which two of these chains supply the maximum amount of energy to the human?
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  • P and Q
  • P and S
  • Q and R
  • Q and S
Ultraviolet radiation from sunlight causes the reaction that produces:
  • $$SO_2$$
  • CO
  • Ozone
  • Fluorides
The importance of an ecosystem lies in
  • Flow of energy
  • Cycling of nutrients
  • Both (A) and (B)
  • None of the above
The source of energy in an ecosystem is
  • Heat from the soil
  • Heat reflected by leaves
  • Burning of sugar
  • Sunlight received by leaves
Hawks and owls living in the same area compete for the same type of mouse for food. Which situation would lead to the greatest problem in the food supply?
  • An increase in the owl population
  • An increase in the mouse population
  • A decrease in the hawk population
  • A decrease in the owl population
First trophic level is represented by:
  • Herbivores
  • Carnivores
  • Insectivores
  • Autotrophs
Out of these, which group has biodegradable wastes?
  • DDT, Mercury, lead
  • Plastic, polyethene, DDT
  • Leather, paper, cloth
  • Synthetic fibres, aluminium cans, wood
A food web _________________________.
  • Increases the variety of food at each trophic level
  • Keeps a balance between organisms
  • Decreases the variety of food but increases the quantity of food at each trophic level
  • Increases the variety as well as the quantity of food at each trophic level
The schematic diagram given here shows a food chain. Which one does not show the direction of energy flow?

382795_0038f9b8be2d442c8b810ae70cb05ccc.png
  • 1
  • 2
  • 3
  • 4
Which of the following is the correct order of flow of energy?
  • Plants--> tigers--> microbes--> goats
  • Plants--> goats--> tigers--> microbes
  • Tiger--> plants--> microbes--> goats
  • Microbes--> tigers--> goats--> plants
Find the incorrect statement about the energy flow through an ecosystem?
  • Energy is conserved and stays in an ecosystem, to be used by organisms repeatedly.
  • Solar radiation is the original energy source for the vast majority of organisms on earth.
  • Energy flow is one-way, from autotrophs to progressively higher trophic levels.
  • Energy flow is inefficient; a lot is lost in each transfer from one organism to another.
  • All solar radiation used in photosynthesis will eventually be lost as heat.
Which of these are positive influences of human beings on the ecosystem?
A. Declaring areas as wildlife sanctuaries
B. Increasing biodegradable packing materials that can be recycled
C. Removing pollutants from toxic industrial smoke
D. Using the natural resources intensively
  • A, B
  • B, C
  • A, B, C
  • B, C, D
Two components of the ecosystem are: 
  • Plants and animals
  • Trees and fungi
  • Living and non living
  • Frogs and man
An ecosystem is the biotic community which along with the physical environment forms an interacting system. It can be _________________.
  • Man-made
  • Temporary
  • Natural
  • All of these
A scorpion kills and then eats a spider. 
Based on its behaviour, which terms describe the scorpion?
  • Producer, Herbivore, Decomposer
  • Producer, Carnivore, Heterotroph
  • Predator, Carnivore, Consumer
  • Predator, Autotroph, Herbivore
There are more herbivores than carnivores in the food chain because____

1.  More herbivores are needed to support less number of carnivores
2. Much energy is lost in the transfer of energy from herbivores to carnivores
In this way, food chain stays in equilibrium
  • Option I is correct
  • Option II is correct
  • Option III is correct
  • All of these
Which of the following is true in an ecosystem ?
  • Animals can live without plants
  • Plants can live without animals
  • Animals can survive for long without plants
  • Plants can survive for long without animals
Depletion of ozone layer is noticed on 
  • America
  • Asia
  • Australia
  • All over the earth
Living things interact with ________ constantly.
  • Other organisms
  • Environment
  • Non-living things
  • All of the above
How can you define waste?
  • Unused materials
  • Collected materials
  • Unwanted or unusable materials
  • None of these
Living organisms do not have any effect on the abiotic components around them in an ecosystem.
  • True
  • False
  • Ambiguous
  • Data insufficient
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