Discussion
The word 'rhamphotheca' means:
Answer: A
Rhamphotheca means the bird's bill made of keratin. The passage says the bill is covered with a sheet of keratin, the rhamphotheca, which in petrels and a few other birds is divided into plates.
The rump of the tail is where the preen gland lies, feathers form the plumage, and the tail feathers are not the rhamphotheca.
The passage gives the word in the sentence ‘The bill is covered with a sheet of keratin, the rhamphotheca’, so the word means the keratin covering of the bill, which is option A. The bill itself is the bone, and the covering is the sheath that is divided into plates in petrels.
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