Question

Ora serrata is

• A. Present in utriculus of ear
• B. Oral cavity of protochordate
• C. Gland present in the oral cavity of a frog
• D. A serrated junction between the retina and ciliary body

Answer 1

The correct option is D

A serrated junction between the retina and ciliary body

The correct option is D.

Explanation of the correct option:

1. The serrated connection between the choroid and the ciliary body is known as the ora Serrata.
2. This point represents the shift from the ciliary body's simple, non-photosensitive section to the retina's sophisticated, multi-layered photosensitive region.
3. The inner component of the retina changes into the non-pigmented epithelium of the cilia in this area, whereas the pigmented epithelium of the retina changes into the outer pigmented epithelium of the ciliary body.
4. It is known as the ora ciliaris retinae in animals when the region does not appear to be serrated.

Explanation of the incorrect option:

Option A:

1. The inner ear's utricular maculae contain an otolithic membrane and otoconia (calcium carbonate particles) that bend hair cells in the direction of gravity in vertebrates.
2. This reaction to gravitational pull aids animals in maintaining their balance.

Option B:

1. Protochordates are an ad hoc animal classification system (i.e., not a taxonomic classification system) used to define invertebrate species that are closely related to vertebrates.

Option C:

1. The “Buccal Cavity” is made up of a ciliated columnar epithelium lining with mucous glands that release mucus to help with food lubrication.
2. Salivary glands are absent in frogs.

Final answer: Ora Serrata is a serrated junction between the retina and ciliary body.