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I. In cockroach, each testes extend from...

I. In cockroach, each testes extend from `4^(th)` to `6^(th)` _______ segment.
II. Each compound eye in cockroach consists of about_________ hexagonal ommatidia.
Select the correct option.

A

(a) Thoracic, 1000

B

(b) Thoracic, 2000

C

(c) Abdominal , 1000

D

(d) Abdominal , 2000

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question step by step, we will address each part of the question regarding the cockroach. ### Step 1: Identify the location of testes in cockroach - The question states that each testes extends from the 4th to the 6th segment. In cockroaches, the body is divided into three main parts: head, thorax, and abdomen. The reproductive system, including the testes, is located in the abdominal region. - Therefore, the answer to the first part of the question is **abdomen**. ### Step 2: Determine the number of ommatidia in compound eyes - The second part of the question asks about the number of hexagonal ommatidia in each compound eye of a cockroach. - It is known that each compound eye in cockroaches consists of approximately **2,000 hexagonal ommatidia**. These ommatidia are the individual photoreceptive units that make up the compound eye and are responsible for vision. ### Final Answer Putting both parts together, the complete answer is: I. In cockroach, each testes extend from 4th to 6th **abdominal** segment. II. Each compound eye in cockroach consists of about **2,000** hexagonal ommatidia. ### Selected Option The correct option is **D: abdominal and 2,000**. ---
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