Chapter Exam

Chapter-23 Biosphere — Online MCQ Test

Q: Which of the following is the best definition of biodiversity?

Answer: B. The variety of living organisms in an area — Biodiversity means the variety of plants, animals, and microorganisms found in a particular area or on Earth as a whole.

Q: A species found only in a particular region is called a(n) ______.

Answer: B. Endemic species — Endemic species are native to and restricted to a specific geographic area.

Q: Which of the following best explains the relation between ecosystem and biome?

Answer: C. A biome contains many ecosystems — A biome is a broad region, and within it there can be many ecosystems interacting under similar climate conditions.

SOCIAL · Samacheer Kalvi 9th · Tamil Nadu State Board

Practice Chapter-23 Biosphere with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 9th SOCIAL. This chapter covers: Description Introduces ecosystems biodiversity biomes and conservation practices Keywords Ecosystem Biome Endemic Species Biodiversity Hotspots. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-23 Biosphere — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 9th SOCIAL — Chapter-23 Biosphere, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the biosphere?

A. The part of the Earth where living organisms exist ✓
B. Only the water bodies on Earth
C. The rocky layer beneath the soil
D. The layer of clouds around Earth

Answer: A. The part of the Earth where living organisms exist
The biosphere is the narrow zone of Earth where life exists, including land, water, and air interactions.

Which of the following is the best definition of biodiversity?

A. The number of mountains in a region
B. The variety of living organisms in an area ✓
C. The amount of rainfall in a biome
D. The depth of oceans in the world

Answer: B. The variety of living organisms in an area
Biodiversity means the variety of plants, animals, and microorganisms found in a particular area or on Earth as a whole.

A species found only in a particular region is called a(n) ______.

A. Migratory species
B. Endemic species ✓
C. Domestic species
D. Aquatic species

Answer: B. Endemic species
Endemic species are native to and restricted to a specific geographic area.

Which of the following best explains the relation between ecosystem and biome?

A. A biome is a smaller unit inside an ecosystem
B. An ecosystem is a larger unit inside a biome
C. A biome contains many ecosystems ✓
D. They are completely unrelated

Answer: C. A biome contains many ecosystems
A biome is a broad region, and within it there can be many ecosystems interacting under similar climate conditions.

Which of the following is the most appropriate reason for declaring a region as a biodiversity hotspot?

A. It has many industries and roads
B. It contains a large number of endemic species under serious threat ✓
C. It has the coldest climate in the world
D. It has very few living organisms

Answer: B. It contains a large number of endemic species under serious threat
A biodiversity hotspot is identified by high endemism and significant threat to species and habitats.