Chapter-23 Biosphere — Online MCQ Test
SOCIAL · Samacheer Kalvi 9th · Tamil Nadu State Board
Practice Chapter-23 Biosphere with a free chapter-wise online MCQ test.
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.
Chapter-23 Biosphere — Important Questions & Answers
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.
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.
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.
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.
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.
A biodiversity hotspot is identified by high endemism and significant threat to species and habitats.