9th Social Science - Book Back Answers - Geography Unit 5 - English Medium Guides

  

 

9th - Social Science - Book Back Answers - Geography Unit 5 - English Medium

Tamil Nadu Board 9th Standard Social Science - Geography Unit 5: Book Back Answers and Solutions

    This post covers the book back answers and solutions for Unit 5 – Geography from the Tamil Nadu State Board 9th Standard Social Science textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.

    We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.

    By going through this material, you’ll gain a strong understanding of Geography Unit 5 along with the corresponding book back questions and answers (PDF format).

Question Types Covered:

• 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following 
• 2 Mark Questions: Answer briefly 
• 3, 4, and 5 Mark Questions: Answer in detail

All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.

All the best, Class 9 students! Prepare well and aim for top scores. Thank you!

 Topic: Unit 5. BIOSPHERE

I. Choose the correct Answer

Question 1.
The coldest biome on Earth is __________
(a) Tundra
(b) Taiga
(c) Desert
(d) Oceans
Answer Key:
(a) Tundra
 
Question 2.
This is the smallest unit of biosphere __________
(a) Ecosystems
(b) Biome
(c) Environment
(d) None of the above
Answer Key:
(d) Ecosystems

Question 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
Answer Key:
(d) None of the above

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

Question 5.
Why is the usage of rain forest 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.
Answer Key:
d) because the soil is poor

II. Assertion (A), Reason (R) 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

Question 1.
A: Heterotrophs do not produce their own food.
R: They depend on autotrophs for their nourishment.
Answer Key:
(a) Both assertion (A) and reason(R) are true; R explains A

Question 2.
A: Hotspots are the regions characterized by numerous endemic plants and animal species
living in a vulnerable environment.
R: To manage and focus on conservation work more effectively, researchers identified hotspots.
Answer Key:
(a) Both assertion (A) and reason(R) are true; R explains A

III. Fill in the blanks

1. An area where animals, plants and micro organisms live and interact with one another is known _____
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 freshh water and salt water mix.

Answer Key:

1. Eco System
2. consumers
3. Food web
4. A Biome
5. Xerophytes
6. Estuary

IV. Distinguish Between  

Distinguish Between:

 

1. PRODUCERS	DECOMPOSERS
*Producers are self nourishing components of the ecosystem. Ex., Plants, algae, etc.,	* Decomposers are some organisms that are incapable of preparing their own food. * Ex., Fungi, mushrooms, etc.,
2. TERRESTRIAL BIOMES	AQUATIC BIOMES
*Terrestrial biomes are a group of living organisms that live on land. * Ex., Deer, elephant.	* Aquatic biomes are a group of living organisms that live in aquatic environments. * Fishes
3. TROPICAL VEGETATION	DESERT VEGETATION
* Annual rainfall in this vegetation is above 200 cms. * Ex., Rubber, ebony, bamboo, etc.,	* Annual rainfall in this vegetation is less than 50 cms. * Ex., Thorny scrubs and bushes, palms etc.,
4. SAVANNAS	TUNDRA
* This biome is generally hot and dry and experiences moderate to low rainfall. * The common animals found here are the lion, leopard, tiger, deer etc.,	*This region experiences long severe winter and short cold summer. * The common animals found here are polar beer, reindeer, snowy owl.

V. Answer the following briefly  

1. What is Biosphere?

• Biosphere is a life supporting layer that exists on the Earth's surface.
• It comprises the Lithosphere, Hydrosphere and Atmosphere.

 

2. What is an ecosystem?

• An ecosystem is a community where all living organisms and non living organisms interact with one another.

 

3. What does the term 'biodiversity mean?

• Biodiversity means a wide variety of living organisms which live in a habitat.

 

4. What is meant by loss of biodiversity?

• The extinction of species due to human and natural influences is called loss of biodiversity.

 

5. Mention the various terrestrial biomes.

• Tropical forest biomes. 
• Tropical savanna biomes.
• Desert biomes. 
• Temperate grassland biomes.
• Tundra biomes.

VI. Answer all the questions given under each caption

1. Explain the various components of ecosystem.

 

An ecosystem consists of three basic components. They are

• Abiotic components
• Biotic components.
• Energy components.

ABIOTIC COMPONENTS:

• It includes the non living, inorganic, physical and chemical factors in the environment. Ex., Land, air, water.

BIOTIC COMPONENTS:

• Biotic components include plants, animals, and microorganisms. It can be classified into three categories:
• Producers - Plants, algae.
• Consumers - Goat, lion.
• Decomposers - Fungus, mushrooms.

ENERGY COMPONENTS:

• All organisms in the biosphere use energy to work and convert one form of energy into another.
• The Sun is the ultimate source of energy for the biosphere as a whole.

 

2. Write a paragraph on the function of an ecosystem.

 

ENERGY FLOW:

• The functioning of an ecosystem depends on the pattern of the energy flow.
• It helps in the distribution and circulation of the organic and inorganic matter within an ecosystem.
• Energy flow generally takes place in an hierarchical order in various levels.

FOOD CHAIN:

• The chain of transformation of energy from one group of organisms to another through various trophic levels is called a food chain.

FOOD WEB:

• A system of interlocking and interdependent food chains is called a food web.

 

3. Explain about the aquatic biomes on Earth.

• Aquatic biomes are broadly classified as fresh water biomes and marine biomes.

FRESH WATER BIOMES:

• It comprises lakes, ponds, rivers, streams, wetlands etc.,
• Water lily, lotus, duck are the common plants found here.
• Trout, salmon, turtles, crocodiles etc., are the animals found here.
• Humans rely on freshwater biomes for drinking water, crop irrigation and industry.

MARINE BIOMES:

• They are the largest aquatic biomes on earth.
• It provides a wide range of habitats for marine plants and animals.
• Humans use aquatic biomes for water, food and leisure activities.