Question

Pecten is a structure found in the eyes of
(a)Reptilia
(b)Fish
(c)Bird
(d)Mammals

Answer 1

Hint: It's a non-sensory, pigmented structure that ventures into the glassy humor from the reason where the nervus opticus enters the eyeball. It is believed to both nourish the retina and control the pH of the vitreous body. It protects the retina from sunlight by casting a shadow on it.

Complete step by step answer:
The pecten might be a brush-like structure of veins having a place with the choroid inside the eye of a bird. It is a non-sensory, pigmented structure that projects into the vitreous humor from the purpose where the nervus opticus enters the eyeball. It sustains the retina and controls the pH of the vitreous body. An elevated level of enzyme alkaline phosphatase action in pecten oculi has been connected to the vehicle of supplement atoms from profoundly vascularized pecten oculi into glassy then into retinal cells for nourishment.

So the correct answer is ‘Bird’.

Additional information: In the vertebrate eye, blood vessels dwell in front of the retina, partially obscuring the image. The pecten assists with unwinding this issue by incredibly diminishing the number of veins inside the retina and bringing about the very sharp vision of winged animals like birds of prey. The pigmentation of the pecten is accepted to watch the veins against harm from ultraviolet. Stray light absorption is considered to offer rising to little increments in temperature with the help of melanin granules of pecten oculi of pecten and eye; this may offer extended metabolic rate to enhance eye physiology in low temperatures at high-elevation flights. The structure differs across bird species and is cone-shaped inside the kiwi, vaned inside the ostrich, and creased in most different feathered creatures.

Note:
The pecten is mainly responsible for both, the first one is nourishing the retina and the second one is controlling the pH of the vitreous body. An elevated level of enzyme alkaline phosphatase movement in pecten oculi has been connected to the vehicle of supplement atoms from profoundly vascularized pecten oculi into glassy then into retinal cells for nourishment. It is present altogether birds and a few reptiles.