Biosphere

Samacheer Book Back Questions And Answers For Geography Standard 9 Full Book “Biosphere”

I. Choose the correct answer:
1. The coldest biome on Earth is
a) Tundra
b) Taiga
c) Desert
d) Oceans

2. This is the smallest unit of biosphere.
a) Ecosystems
b) Biome
c) Environment
d) None of the above

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

4. To which climatic conditions are Xerophytic plants specifically adapted to?
a) Saline and sandy
b) Limited moisture availability
c) Cold temperature
d) Humid

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

Questions 6 – 8 are assertion type questions.
Directions:
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

6. Assertion: Heterotrophs do not produce their own food.
Reason: They depend on autotrophs for their nourishment.
Answer:
A is true; R is false

7. Assertion: Hotspots are the regions characterised by numerous endemic plants and animal species living in a vulnerable environment.
Reason: To manage and focus on conservation work more effectively, researchers identified hotspots.
Answer:
Both assertion (A) and reason (R) are true; R explains A

8. Assertion: The number of gorillas in Africa has plummeted by 60% in the past twenty years.
Reason: Non intervention of human beings in the forest areas.
Answer:
Both A and R are false

II. Fill In The Blanks:
1. An area where animals, plants and micro organisms live and interact with one another is known as _____
2. _____ are also called Heterotrophs.
3. _____ is a system of interlocking and independent food chains.
4. _____is an extensive large ecosystem.
5. The vegetative type commonly found in desert biomes is called _____.
6. _____is an aquatic biome that is found where fresh water and salt water mix.

Answers:
1. Habitat
2. Consumers
3. Food web
4. A biome
5. Xerophytes
6. Estuary