Samacheer Kalvi 9th Social Science – Geography Unit 5 Book Back Answers:
Samacheer Kalvi 9th Standard New Social Science Book Back 1 Mark and 2 Mark Question & Answers PDF uploaded and available below. Class 9 New Syllabus 2021 to 2022 Book Back Question & Answer available for both English and Tamil Mediums. Class 9 Social Geography Book Unit 5 – Biosphere Answers/Solutions are provided on this page. 9th Std Social Science History Book portion consists of 11 units, Geography Book portion consists of 8 units, Civics book portion consists of 6 units, and Economics book portion consists of 5 units, All Social Book Back One, and Two Mark Solutions are given below.
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Samacheer Kalvi 9th Social Science Book Back Solutions PDF:
9th Social Subject 1 Mark and 2 Mark Solutions PDF available below. Click the Download option to download the book back 1 Mark & 2 Mark questions and answers. Take the printout and use it for exam purposes. Samacheer Kalvi 9th Geography Unit 5 Answers are given below.
Geography Book Back Answers
Unit 5 – Biosphere
I. Fill in the blanks.
1. An area where animals, plants and microorganisms 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
II. Choose the correct answer.
1. The coldest biome on Earth is ……….
(a) Tundra
(b) Taiga
(c) Desert
(d) Oceans
Answer: (a) Tundra
2. This is the smallest unit of biosphere.
(a) Ecosystems
(b) Biome
(c) Environment
(d) None of the above
Answer: (a) Ecosystems
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: (b) Decomposers
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: (a) Saline and sandy
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
Answer: (b) because the temperature is too warm
III. 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
Answer: (C) A is true; R is false
6. (A): Heterotrophs do not produce their own food.
(R): They depend on autotrophs for their nourishment.
Answer:
(C) A is true; R is false
7. (A): Hotspots are the regions characterised 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:
(A) Both assertion (A) and reason (R) are true; R explains A
8. (A): The number of gorillas in Africa has plummeted by 60% in the past twenty years.
(R): Non intervention of human beings in the forest areas.
Answer:
(D) Both A and R are false
III. Answer the following in brief:
1. What is Biosphere?
Answer:
Biosphere is a life supporting layer that exists on the earth’s surface. This layer on earth encompasses the Lithosphere, Hydrosphere and Atmosphere. It includes flora and fauna that thrive on or near the earth’s surface.
2. What is an ecosystem?
Answer:
The place on earth where living organisms live and interact with one another and with their physical environment is called an ecosystem.
3. What does the term ‘biodiversity’ meant?
Answer:
Biodiversity or biological diversity refers to a wide variety of living organisms (plants, animals and other micro organisms) which live in a habitat. It is highly influenced by topography, climate as well as human activities.
4. What is meant by loss of biodiversity?
Answer:
The extinction of species (flora and fauna) due to human and natural influences is called loss of biodiversity. The biodiversity loss has a great impact on mankind and also affects land, water, air etc. Habitat destruction due to deforestation, population explosion, pollution and global warming are the major cause for loss of biodiversity.
5. Mention the various terrestrial biomes.
Answer:
The major terrestrial biomes of the world are:
A. Tropical Forest Biomes
B. Tropical Savanna Biomes
C. Desert Biomes
D. Temperate Grassland Biomes
E. Tundra Biomes
IV. Give reasons for the following:
1. Producers are also called autotrophs.
Answer:
Producers are self nourishing components of the ecosystem. Hence they are called Autotrophs. They are found both on land and water, e.g. Plants, Algae, Bacteria etc.
2. Biosphere provides a stable ecosystem.
Answer:
- Biosphere extends from the deep ocean trenches to lush rain forests.
- People play an important role in maintaining the flow of energy in the biosphere.
- There are places on earth that are both biologically rich and deeply threatened.
- Hence Biosphere provides a stable ecosystem.
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