MCQ Chapter 2 Life on Earth Class 9 Social Science CBSE Board

1. Which adaptation helps certain desert plants and animals survive in dry conditions?

Requiring continuous heavy rainfall

Storing water and withstanding heat and dryness

Depending on permanently frozen soil

Living only in deep ocean water

Question 1 of 20

2. Which of the following is commonly associated with desert vegetation?

Dense forests of broad-leaved trees

Thick layers of aquatic plants

Sparse vegetation and plants such as cacti

Extensive growth of trees on permanently frozen soil

Question 2 of 20

3. What is permafrost?

Soil that remains permanently wet

Soil that contains only sand

Soil found exclusively in tropical rainforests

Soil that remains frozen for almost the entire year

Question 3 of 20

4. Which biome is the coldest of all the major terrestrial biomes described?

Tundra

Savanna

Tropical rainforest

Desert

Question 4 of 20

5. Which plants are commonly found in the tundra biome?

Tall tropical rainforest trees only

Mosses, lichens, and small shrubs

Dense stands of coconut palms

Cacti and other desert plants exclusively

Question 5 of 20

6. Which group of animals is commonly associated with the tundra biome?

Lions, giraffes, and elephants

Whales, dolphins, and plankton

Reindeer, Arctic foxes, and polar bears

Camels, desert lizards, and snakes only

Question 6 of 20

7. Why is the tundra ecosystem considered fragile?

It receives excessive rainfall throughout the year

It has too many dense tropical forests

It contains no living organisms

Even small changes in temperature can affect its ecosystem

Question 7 of 20

8. Approximately what proportion of the Earth's surface is covered by aquatic biomes?

Three-fourths

One-fourth

One-tenth

One-half

Question 8 of 20

9. Which of the following belongs to a freshwater biome?

Coral reef

Lake

Open ocean

Sea

Question 9 of 20

10. Which of the following is an example of a marine biome?

Pond

River

Coral reef

Freshwater wetland

Question 10 of 20

11. How do marine biomes influence the Earth's climate?

They permanently stop the movement of air

They prevent all rainfall over land

They remove every form of atmospheric moisture

They store and distribute heat

Question 11 of 20

12. Which organisms are commonly associated with freshwater biomes?

Fish, frogs, and insects

Polar bears and reindeer exclusively

Lions and giraffes exclusively

Camels and desert snakes exclusively

Question 12 of 20

13. What is the role of producers in a biome pyramid?

They obtain all their energy by hunting other animals

They capture solar energy through photosynthesis

They consume only dead animals

They prevent the movement of energy through ecosystems

Question 13 of 20

14. Which organisms are primary consumers in a biome pyramid?

Producers

Top predators

Herbivores

Decomposed non-living materials

Question 14 of 20

15. What happens to available energy as we move upwards through a biome pyramid?

It increases continuously

It remains exactly the same

It becomes unlimited

It decreases at each trophic level

Question 15 of 20

16. What does a biome pyramid help us understand?

The structure of ecosystems and the flow of energy

Only the geographical boundaries of countries

Only the height of trees

The distribution of roads and buildings

Question 16 of 20

17. What is biodiversity?

The number of buildings in a region

The variety of life, including species, genetic differences, and ecosystems

The total amount of rainfall received in a year

The number of roads in a forest

Question 17 of 20

18. Which of the following is a biodiversity hotspot mentioned in the chapter?

The Sahara Desert alone

The Gobi Desert alone

The Western Ghats

The open ocean alone

Question 18 of 20

19. What is the main purpose of identifying biodiversity hotspots?

To convert every forest into farmland

To encourage the unrestricted exploitation of natural resources

To remove all human communities from every region

To identify and protect regions rich in unique species

Question 19 of 20

20. Which of the following is an example of ecosystem-based conservation?

Protecting mangroves along coastlines

Cutting down all trees in mountain regions

Filling wetlands with construction materials

Removing all vegetation from deserts

Question 20 of 20

Leave a Reply Cancel reply

CBSE Board English Medium

CBSE Board Hindi Medium

बिहार बोर्ड

उत्तर प्रदेश बोर्ड

महाराष्ट्र बोर्ड

मध्य प्रदेश बोर्ड

ગુજરાત બોર્ડ

PSC Exam Preparation