Biology · STRUCTURAL ORGANISATION IN ANIMALS

Examine the following external features of the head of a frog. Which statement accurately describes their protection and sensory reception?

1. Eyes are protected in water by a nictitating membrane, and a membranous tympanum receives sound signals.
2. Eyes possess an immovable upper eyelid and lack any specialized membrane in water.
3. External pinnae project laterally behind the eyes to funnel acoustic waves directly to the inner ear.
4. Nictitating membrane functions exclusively on land to shield the cornea against ultraviolet rays.