Question

The diameter of the eye in Giant Squid (Architeuthis) is?
A. 37.5 cm
B. 27.5cm
C. 20cm
D. 15cm

Answer 1

Hint: The giant squid is the second-largest mollusc. It can grow to a tremendous size referring to deep-sea gigantism. The giant squid has the largest eyes in any living organism but the eyes cannot detect colours.

Complete answer: The giant squid also known as Architeuthis dux is a species of deep-ocean dwelling squid in the family Architeuthidae. A giant squid has a mantle (torso), eight arms, and two longer tentacles. The tentacles are the longest known tentacles of any cephalopod. The giant squid has a brilliant nervous system and complex brain. It also has the largest eyes of any living creature —up to at least 27.5 cm in diameter, with a 9 cm pupil. Large eyes can better detect light (including bioluminescent light), which is scarce in deep water. The giant squid is believed that they cannot detect colour, but it can probably discern small differences in tone, which is important in the low-light conditions of the deep ocean.
So, the answer is B-27.5cm

Additional Information:
Each tentacular club is divided into three regions in a giant squid—the carpus ("wrist"), manus ("hand"), and dactylus ("finger"). The giant squid has small fins at the rear of their mantles that are used for locomotion. They use organs called statocysts to sense their orientation and motion in water. They exhibit sexual dimorphism. The predators of adult giant squid are sperm whales, but pilot whales may also feed on them. Juveniles are preyed on by deep-sea sharks and other fish.

Note: Giant squid and some other large squid species maintain neutral buoyancy in seawater through an ammonium chloride solution which is found throughout their bodies and is lighter than seawater.