Biosphere Book Back Questions & Answers
Unit 5 > Social > Class 9 > Samacheer Kalvi - English Medium
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1. The coldest biome on Earth is
a) Tundra
b) Taiga
c) Desert
d) Oceans
Correct answer: a) Tundra
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2. This is the smallest unit of biosphere.
a) Ecosystems
b) Biome
c) Environment
d) None of the above
Correct answer: a) Ecosystems
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3. Nutrients are recycled in the atmosphere with the help of certain micro organisms, referred to as
a) Producers
b) Decomposers
c) Consumers
d) None of the above
Correct answer: b) Decomposers
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4. To which climatic conditions are Xerophytic plants specifically adapted to?
a) Saline and sandy
b) Limited moisture availability
c) Cold temperature
d) Humid
Correct answer: a) Saline and sandy
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5. Why is the usage of rainforest biomes for large scale agriculture unsustainable?
a) because it is too wet.
b) because the temperature is too warm.
c) because the soil is too thin.
d) because the soil is poor.
Correct answer: d) because the soil is poor.
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1. An area where animals, plants and micro organisms live and interact with one another is known as _________
Correct answer: Eco System
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2. ___________ are also called Heterotrophs.
Correct answer: consumers
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3. __________ is a system of interlocking and independent food chains.
Correct answer: Food web
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4. _______ is an extensive large ecosystem.
Correct answer: A Biome
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5. The vegetative type commonly found in desert biomes is called __________
Correct answer: Xerophytes
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6. __________ is an aquatic biome that is found where fresh water and salt water mix
Correct answer: Estuary
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1. (A): A: Heterotrophs do not produce their own food... (R): R: They depend on autotrophs for their nourishment.
a) Both assertion (A) and reason(R) are true; R explains A
b) Both assertion(A) and reason(R) are true; R does not explain A
c) A is true; R is false
d) Both A and R are false
Correct answer: a) Both assertion (A) and reason(R) are true; R explains A
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2. (A): A: Hotspots are the regions characterised by numerous endemic plants and animal species living in a vulnerable environment... (R): R: To manage and focus on conservation work more effectively, researchers identified hotspots.
a) Both assertion (A) and reason(R) are true; R explains A
b) Both assertion(A) and reason(R) are true; R does not explain A
c) A is true; R is false
d) Both A and R are false
Correct answer: a) Both assertion (A) and reason(R) are true; R explains A
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3. (A): A: The number of gorillas in Africa has plummeted by 60% in the past twenty years. ... (R): R: Non intervention of human beings in the forest areas
a) Both assertion (A) and reason(R) are true; R explains A
b) Both assertion(A) and reason(R) are true; R does not explain A
c) A is true; R is false
d) Both A and R are false
Correct answer: c) A is true; R is false
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1. World Wild Life Day
Correct answer: 3rd March
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2. International Day of Forest
Correct answer: 21st March
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3. World Water Day
Correct answer: 22nd March
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4. Earth Day
Correct answer: 22nd April
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5. World Environment Day June 5th
Correct answer: June 5th
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6. World Oceans Day
Correct answer: 8th June