Which term describes a frequently windless area near the Equator with low pressure and light winds?

Which term describes a frequently windless area near the Equator with low pressure and light winds?

• A. Doldrums
• B. Umbra
• C. Penumbra
• D. Transpiration

Answer: (A)

This question tests understanding of wind patterns around the equator and the specific term for a calm belt where surface winds are weak. The area near the equator tends to have low pressure because intense solar heating causes air to rise, which reduces the strength of winds at the surface. This combination—low pressure and very light or no winds—describes the doldrums, a zone sailors historically dreaded for getting becalmed. The other terms refer to unrelated ideas: an umbra and a penumbra are shadow regions in eclipses, and transpiration is a plant’s process of losing water through its leaves. So the term that best captures a frequently windless area near the Equator with low pressure and light winds is the doldrums.

This question tests understanding of wind patterns around the equator and the specific term for a calm belt where surface winds are weak. The area near the equator tends to have low pressure because intense solar heating causes air to rise, which reduces the strength of winds at the surface. This combination—low pressure and very light or no winds—describes the doldrums, a zone sailors historically dreaded for getting becalmed. The other terms refer to unrelated ideas: an umbra and a penumbra are shadow regions in eclipses, and transpiration is a plant’s process of losing water through its leaves. So the term that best captures a frequently windless area near the Equator with low pressure and light winds is the doldrums.