MCQ
Function of nematory in phylum cnidaria.
- AOnly for stability
- BDefence and digest
- CDefence the capture of prey and excretion.
- ✓Defence and capture of prey.
✓
Answer
Correct option: D.
Defence and capture of prey.
d
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(A) At the posterior pole of the eye, lateral to the blind spot, there is a yellowish pigmented spot called macula lutea with a central pit called the fovea.
(B) Fovea is the point where the visual acuity is the lowest.
(C) The space between cornea and lens is called aqueous chamber and contain a thick watery fluid called aqueous humor.
(D) The space between lens and retina is called vitreous chamber and is filled with transparent gel called vitreous chamber.
(E) The photopigments in human eye are composed of opsin, a protein and retinal, an ketone of vitamin A.
(F) The action potentials are transmitted by the optic nerve to the visual cortex area of the brain, where the neural impulses are analyzed and the image is formed on the retina.
(G) The canal of outer ear is called external auditory meatus.
(H) Pinna collects the vibrations in the air which produce sound.
(I) Tectorial membrane is commonly known as ear drum.
(J) The very fine hairs and wax-secreting glands are present in the skin of pinna and meatus,
(K) The tympanic membrane is composed of connective tissues covered with skin inside and with mucus membrane outside.
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