Question

The sucker of Remora is a modification of
(A) Dorsal fin
(B) Pectoral fin
(C) Mouth
(D) Operculum

Answer 1

Hint: Remora were also known as suckerfish which uses it’s a sucker to attach to the objects or animals like a shark for transportation, food, etc. It is present in a single number that helps in the movement of the fishes.

Complete answer:
Dorsal fin – It is the unpaired fin located on the top of fishes. Many species have adapted dorsal fins for their uses.
Pectoral fin – They are paired fin and help in the movement of fish.
Mouth – It is the organ that helps to take/ingest food.
Operculum – It is the bony flap that covers the gills of bony fish. Its function is to protect the gills. It is also used for respiration and feeding.
The dorsal fin of Remora gets modified to form the sucker.
- Remora attaches itself to the shark at its belly for its transportation and food. This remora can travel to different areas without spending energy and the leftover food of the shark was eaten by this fish. This type of relationship seen in Shark and Remora is known as Commensalism.
Sharks also protect Remora from predators.
Commensalism is the relationship in which one organism is benefited and another is neither benefited or harmed.

So, the correct answer is ‘Dorsal fin’.

Note: The word dorsal means at back, therefore the dorsal fin is located at back.
The word pectoral means situated in or near the chest, therefore the pectoral fin is located near the chest and on both right and left side of the fish i.e in pairs and acts as arms of fish.