What is the term for the protective membrane that covers a frog's eyes while in water?

Nictitating membrane

The correct answer is Option (1) -Nictitating membrane

The term for the protective membrane that covers a frog's eyes while in water is (A) Nictitating membrane.

• Nictitating Membrane: The nictitating membrane, also known as the "third eyelid" or "haw," is a translucent protective membrane that covers a frog's eyes. This membrane helps protect the frog's eyes while they are submerged in water or during other activities. It can act as a shield, preventing debris or water from directly contacting the eye. The nictitating membrane is present in many amphibians, reptiles, and some birds.
• The other options (2) Protective film, (3) Eye shield, and (4) Corneal covering are not commonly used terms to describe the protective membrane over a frog's eyes.

So, the nictitating membrane is the correct term for this protective structure in frogs.