Desert Ecosystems and Their Challenges

What is the primary factor that defines a desert?

• High temperatures

• Presence of sand

• Scarcity of water

• Lack of vegetation

Which desert is known as the world's largest hot desert?

• Arabian Desert

• Atacama Desert

• Sahara Desert

• Australian Desert

Why do temperatures in the Sahara Desert drop significantly at night?

• Absence of clouds

• Lack of vegetation

• Presence of clouds

• High humidity

How do cacti survive in desert conditions?

• By growing rapidly

• By storing water in their stems

• By having deep roots

• By storing water in their leaves

What adaptation helps camels survive without water for days?

• Wide feet

• Thick fur

• Humps storing fat

• Long legs

What is a common characteristic of nomadic tribes in deserts?

• Frequent travel

• Permanent settlements

• Urban living

• Agricultural lifestyle

What is a significant challenge faced by frozen deserts?

• Abundant vegetation

• High temperatures

• Lack of sunlight

• Frequent rainfall

What is a major cause of desertification?

• Excessive rainfall

• Overfishing

• Deforestation

• Urbanization

How can individuals help prevent the spread of deserts?

• By using more water

• By increasing deforestation

• By recycling and conserving water

• By planting non-native species

What is the impact of water pollution on desertification?

• It has no impact

• It contributes to desertification

• It reduces desertification

• It increases vegetation