Question

Refractive region of ommatidium of cockroach

• A. Cornea
• B. Retinular
• C. Vitrellae
• D. Ocelli

Hint:

Parts of an ommatidium: \[ \boxed{ \begin{aligned} &\text{Cornea} &&\rightarrow \text{Refractive region} &\text{Crystalline cone} &&\rightarrow \text{Focuses light} &\text{Retinular cells} &&\rightarrow \text{Photoreceptors} \end{aligned} } \]

Answer 1

The Correct Option is A

Step 1: Recall the structure of an ommatidium. The transparent outermost part of each ommatidium is the cornea, which acts as the refractive region by bending incoming light rays. \[ \boxed{\text{Cornea } \rightarrow \text{ Refractive region}} \]

Step 2: Eliminate the remaining options. \[ \begin{aligned} \text{Retinular cells} &\rightarrow \text{Photoreceptor cells} \text{Vitrellae} &\rightarrow \text{Supportive crystalline cone cells} \text{Ocelli} &\rightarrow \text{Simple eyes} \end{aligned} \]

Step 3: Choose the correct option. Hence, \[ \boxed{(A)} \] is the correct answer.