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Science M.C.Q

our environment · Gujarat Board (GSEB) STD 10 (GSEB - English Medium). 33 questions.

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M.C.Q

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33 questions · timed · auto-graded

MCQ 11 Mark
Select the mismatched pair in the following and correct it.
  • A
    Parasite$-$Consumers which obtain liquid food nutrients from host organisms.
  • B
    Agro$-$ecosystem$-$A man$-$made ecosystem
  • C
    $UV$ radiation$-$Causes skin cancer in human beings.
  • ✓
    Ecosystem$-$Physical components of environment.
Answer
Correct option: D.
Ecosystem$-$Physical components of environment.
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MCQ 21 Mark
Which is the correct statement regarding food chain?
  • A
    All consumers are not producers.
  • B
    More energy is available at lower trophic levels.
  • C
    One organism may be involved in more than one food chain.
  • ✓
    All of the given
Answer
Correct option: D.
All of the given
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MCQ 31 Mark
Statement $X :$ Decomposers satisfy their energy requirement directly from producers. Statement $Y :$ The amount of available energy in an ecosystem depends on the rate of photosynthesis carried out by the producers. Which option is correct for statements $X$ and $Y?$
  • A
    $X$ and $Y$ both correct.
  • B
    $X$ and $Y$ both incorrect.
  • C
    $X$ correct and $Y$ incorrect.
  • ✓
    $X$ incorrect and $Y$ correct.
Answer
Correct option: D.
$X$ incorrect and $Y$ correct.
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MCQ 41 Mark
By whom the number of organisms are limited at trophic level of food chain?
  • ✓
    Less availability of energy at higher tropic level
  • B
    Sufficient food supply
  • C
    Polluted air
  • D
    Water
Answer
Correct option: A.
Less availability of energy at higher tropic level
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MCQ 51 Mark
Which of the following groups have only non$-$biodegradable components ? $1$. wood, paper, leather $2.$ polythene, detergent, $\text{PVC 3}$. plastic, detergent, glass $4$. plastic, grass, animal dung
  • A
    $3$
  • B
    $4$
  • C
    $1$ and $3$
  • ✓
    $2$ and $3$
Answer
Correct option: D.
$2$ and $3$
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MCQ 61 Mark
Which organism is more affected by biological magnification problem arising due to entry of $\text{DDT}$ in pond ecosystem?
  • ✓
    Man
  • B
    Birds habitat near the pond
  • C
    Fishes in pond
  • D
    Aquatic plants in pond
Answer
Correct option: A.
Man
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MCQ 71 Mark
Usually green plants are at first level in an ecosystem because$ ...$
  • A
    they are widely spread on this earth.
  • B
    they are fixed at one place in soil.
  • ✓
    they synthesise food with the help of sunlight.
  • D
    herbivores are more than carnivores.
Answer
Correct option: C.
they synthesise food with the help of sunlight.
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MCQ 81 Mark
Statement $X :$ Reduction in number of prey altimately results in reduction of the number of predator. Statement $Y :$ Ozone layer absorbs harmful ultraviolet radiations. Which option is correct for statements $X$ and $Y?$
  • ✓
    $X$ and $Y$ both correct.
  • B
    $X$ and $Y$ both incorrect.
  • C
    $X $correct and $Y$ incorrect.
  • D
    $X$ incorrect and $Y$ correct.
Answer
Correct option: A.
$X$ and $Y$ both correct.
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MCQ 91 Mark
When frog uses grasshopper as food, then energy flow occurs from $...$
  • A
    producer to decomposer.
  • B
    producer to primary consumer.
  • ✓
    primary consumer to secondary consumer.
  • D
    primary carnivores to higher carnivores.
Answer
Correct option: C.
primary consumer to secondary consumer.
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MCQ 101 Mark
Which of the following are environment friendly practices?
  • A
    Carrying cloth-bags to purchases in while shopping
  • B
    Switching off unnecessary lights and fans.
  • C
    Use reusuable razors, nappies and pens.
  • ✓
    All of the given.
Answer
Correct option: D.
All of the given.
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MCQ 111 Mark
Find correct sequence for food chain $....$
  • A
    producers $\rightarrow$ decomposers $\rightarrow$ herbivores
  • ✓
    producers $\rightarrow$ herbivores $\rightarrow$ carnivores
  • C
    decomposers $\rightarrow$ producers $\rightarrow$ herbivores
  • D
    producers $\rightarrow$ herbivores $\rightarrow$ decomposers $\rightarrow$ carnivores $\rightarrow$ omnivores
Answer
Correct option: B.
producers $\rightarrow$ herbivores $\rightarrow$ carnivores
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MCQ 121 Mark
In which category does the human beings fall in an ecosystem?
  • A
    Herbivores
  • B
    Carnivores
  • C
    Decomposers
  • ✓
    Omnivores
Answer
Correct option: D.
Omnivores
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MCQ 131 Mark
Which of the following constitute a food chain?
  • A
    Grass, wheat and mango
  • ✓
    Grass, goat and human
  • C
    Goat, cow and elephant
  • D
    Grass, fish and goat
Answer
Correct option: B.
Grass, goat and human
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MCQ 141 Mark
Which of following is wrong statement?
  • A
    All green plants and blue$-$green algae are producers.
  • ✓
    Green plants derived their food from organic compounds.
  • C
    Producers synthesise their food by using inorganic elements.
  • D
    Green plants transformed solar energy into chemical energy.
Answer
Correct option: B.
Green plants derived their food from organic compounds.
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MCQ 151 Mark
In the food chain comprising of a frog, snake, grass, grasshopper, which organisms is at third trophic level in it?
  • A
    Snake
  • ✓
    Frog
  • C
    Grass
  • D
    Grasshopper
Answer
Correct option: B.
Frog
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MCQ 161 Mark
In food chain, organisms which synthesise carbohydrates by the conversion of radiant energy are called $....$
  • ✓
    primary producers
  • B
    primary consumers
  • C
    primary carnivores
  • D
    primary decomposers
Answer
Correct option: A.
primary producers
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MCQ 171 Mark
What is formed by interdependent organisms to each other for their nutrition?
  • A
    Biosphere
  • ✓
    Food chain
  • C
    Ecosystem
  • D
    Environment
Answer
Correct option: B.
Food chain
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MCQ 181 Mark
What is being form due to entry of harmful chemical in food chain?
  • A
    Bioequilibrium
  • B
    Eutrophication
  • ✓
    Biological magnification
  • D
    Biological regulation
Answer
Correct option: C.
Biological magnification
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MCQ 191 Mark
Ecosystem is an interacting system made up of $...$
  • ✓
    organisms and their physical surroundings.
  • B
    producers and consumers.
  • C
    producers and their physical surroundings.
  • D
    consumers and their physical surroundings.
Answer
Correct option: A.
organisms and their physical surroundings.
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MCQ 201 Mark
Which of the following is an example of non$-$biodegradable waste?
  • A
    Fruits
  • B
    Vegetables
  • C
    Paper
  • ✓
    Polythene
Answer
Correct option: D.
Polythene
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MCQ 211 Mark
Which of the following is an example of biodegradable waste?
  • ✓
    Vegetables or fruits
  • B
    Glass
  • C
    Plastic
  • D
    Metal
Answer
Correct option: A.
Vegetables or fruits
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MCQ 221 Mark
Which of the following statement is wrong in case of food chain?
  • ✓
    Decomposers can derive their food from all other nutritional substances except producers.
  • B
    The one which are not producers are consumers.
  • C
    More energy is available at lower trophic levels.
  • D
    One organism may be associated with more than one food chain.
Answer
Correct option: A.
Decomposers can derive their food from all other nutritional substances except producers.
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MCQ 231 Mark
Which of the following animal has lowest concentration of pesticides?
  • A
    Snake
  • ✓
    Rat
  • C
    Kite
  • D
    Peacock
Answer
Correct option: B.
Rat
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MCQ 241 Mark
In an ecosystem third trophic level is always occupied by which animals?
  • A
    Herbivores
  • ✓
    Carnivores
  • C
    Producer
  • D
    Decomposers
Answer
Correct option: B.
Carnivores
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MCQ 251 Mark
What is the role of decomposers in an ecosystem?
  • A
    Converts inorganic elements in simple form
  • ✓
    Converts organic compound in inorganic elements
  • C
    Converts inorganic elements in organic compounds
  • D
    Both $B$ and $C$
Answer
Correct option: B.
Converts organic compound in inorganic elements
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MCQ 261 Mark
Which trophic level, lowest energy available in an ecosystem?
  • A
    Producer
  • B
    Herbivores
  • ✓
    Carnivores
  • D
    Decomposers
Answer
Correct option: C.
Carnivores
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MCQ 271 Mark
Which trophic level has highest energy in an ecosystem?
  • ✓
    Producers
  • B
    Herbivores
  • C
    Primary carnivores
  • D
    Higher carnivores
Answer
Correct option: A.
Producers
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MCQ 281 Mark
An ecosystem has producers, herbivores and carnivores but without which of following it is not complete?
  • A
    Secondary carnivores
  • B
    Higher carnivores
  • C
    Omnivores
  • ✓
    Decomposers
Answer
Correct option: D.
Decomposers
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MCQ 291 Mark
Which of the following problem is a result of man$-$made activities?
  • A
    Breaking food chain due to deforestation
  • B
    Global warming
  • C
    Depletion of ozone layer
  • ✓
    All of the given
Answer
Correct option: D.
All of the given
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MCQ 301 Mark
A rat is in which category of consumer animals?
  • A
    Herbivores
  • B
    Carnivores
  • ✓
    Omnivores
  • D
    Decomposer
Answer
Correct option: C.
Omnivores
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MCQ 311 Mark
In an ecosystem$……….$
  • A
    unidirectional flow of both energy and nutrients.
  • B
    cyclic flow of both energy and nutrients.
  • C
    cyclic flow of energy and unidirectional flow of nutrients.
  • ✓
    unidirectional flow of energy and cyclic flow of nutrients.
Answer
Correct option: D.
unidirectional flow of energy and cyclic flow of nutrients.
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MCQ 321 Mark
Animals that fed on both producer as well as consumer trophic level are called$.....$
  • A
    herbivores
  • B
    carnivores
  • ✓
    omnivores
  • D
    decomposers
Answer
Correct option: C.
omnivores
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MCQ 331 Mark
Which process is significant in a primary producers for to sustain an ecosystem?
  • A
    Biological magnification
  • ✓
    Photosynthesis
  • C
    Respiration
  • D
    Water absorption
Answer
Correct option: B.
Photosynthesis
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