Water Supply and Crop Yield in Sub-Saharan Africa

The video discusses the challenges of water scarcity in food production, focusing on Sub-Saharan Africa. It highlights the role of international trade and virtual water, and the low crop yields in Africa. The video explores strategies to improve yields, such as better water and fertilizer use, and emphasizes Africa's potential to contribute to global food supply sustainably.

What percentage of the world's withdrawn water resources is used for irrigation?

• 80%

• 70%

• 60%

• 50%

Which continents are the major exporters of virtual water?

• Europe and South America

• Australia and Asia

• North America and Oceania

• Asia and Africa

What does the term 'virtual water' refer to in the context of international trade?

• Water used for recreational activities

• Water used for industrial purposes

• Water used in food production

• Water used for domestic purposes

What is the typical crop yield in Sub-Saharan Africa compared to the global average?

• Two-thirds

• One-third

• One-half

• Equal

Which regions are identified as major water-scarce areas?

• Polar regions

• Equatorial regions

• Middle latitude of the northern hemisphere

• Southern hemisphere

What is the role of GIS in studying crop yield growth in Sub-Saharan Africa?

• To increase water supply

• To simulate climate change

• To conduct large-scale assimilation

• To reduce fertilizer use

What impact does increasing water supply have on maize yield in Sub-Saharan Africa?

• Moderate increase

• No impact

• Significant increase

• Slight decrease

What happens to maize yield when fertilizer supply is increased to meet crop demand?

• Yield decreases

• Yield remains the same

• Yield increases significantly

• Yield becomes unstable

What is the potential benefit of doubling the crop yield in Sub-Saharan Africa?

• No need to import cereals

• Increased water scarcity

• Higher import costs

• Reduced food quality

What is the main challenge in unleashing Sub-Saharan Africa's potential for food supply?

• High production costs

• Political instability

• Lack of technology

• Sustainable and equitable development