Which of the following types of feathers is used for flight in birds?

1. Analyze the question The question asks which type of feather is used for flight. Birds have several feather types, each with a different job.

2. Explain the concept

• Quill (flight feathers or remiges): These are the large, stiff feathers on the wings (primaries and secondaries) and tail (rectrices). They are strong and have a firm central shaft with a broad vane, so they give lift and thrust for flight and help with steering. The word "quill" is often used in JAMB for these main flight feathers.
• Filoplume: These are thin, hair-like feathers with a few barbs at the tip. They work as sensory feathers that help the bird detect feather position and vibration.
• Covert: These are smaller feathers that cover the bases of the flight feathers. They give a smooth, streamlined body shape and cover the gaps. They help flight indirectly but are not the main flight feathers.
• Down: These are soft, fluffy feathers close to the skin. They trap air for insulation and keep the bird warm.

3. Solution (elimination)

• Down is for insulation, so it is out.
• Filoplume is sensory, so it is out.
• Covert is for streamlining and covering, so it is not the main flight feather.
• Quill (the large wing and tail flight feathers) is the one that provides the force for flight.

4. Answer The correct option is A. Quill.

5. Exam tip Match each feather to its job:

• Quill = Quick flight
• Down = Dress warm
• Filoplume = Feels (sensory)
• Covert = Cover and smooth the body

Whenever a question says "flight", look for the large wing and tail feathers, which are quill or flight feathers.