Question

The diagram represents the reproductive organs of a male cockroach. Choose the correct combination of labelling.

• A. a- $8^{th}$sternum, b- analcercus, c- ${10}^{th}$ targum, d- anal style
• B. a- ${10}^{th}$ targum, b- anal cereus, c- anal style, d- $8^{th}$ sternum
• C. a- anal style, b- anal cereus, c- ${10}^{th}$ targum, d- $8^{th}$ sternum
• D. a- $8^{th}$ sternum, b- anal style, c- ${10}^{th}$ targum, d-analcercus
• E. a- anal cereus, b- $8^{th}$ sternum, c- ${10}^{th}$ targum, d- anal style

Answer 1

The correct option is A a- $8^{th}$sternum, b- analcercus, c- ${10}^{th}$ targum, d- anal style

The segments on the dorsal side are called as tergum, while that on ventral side are called as sternum. Here, labelling 'a' is the ventral side which is the sternum while labelling 'c' is on the dorsal side and is the tergum. From near the 10${}^{th}$ segment of the body of a cockroach, arises the pair of appendages at the end of the abdomen, called as the anal cerci. These are important sense organs of the organisms as they are wind sensitive and detect vibrations. In male cockroaches, the 9${}^{th}$ sternite bears a pair of anal styles.
Therefore, the correct answer is option A.