Question

Respiratory organs of Cockroach are called
A. Maxillae
B. Spiracles
C. Mandibles
D. Labrum

Answer 1

Hint:Cockroaches use holes in their body and a special tube structure called tracheae for respiration. These openings are usually located on the outside of the exoskeleton, paired and present on the thorax and abdomen.

Complete answer:
Cockroaches are insect species found in Phylum Arthropoda. The body of the cockroach is separated into three regions namely, head, thorax and abdomen. They have jointed appendages. The body is enclosed by a hard exoskeleton made of chitin. There are hardened plates called sclerites on each segment of the exoskeleton which are connected together by a thin, flexible articular membrane.
The anterior end of the head bears the appendages containing the biting and chewing portions of the mouth. The mouthpieces consist of a labrum (upper lip), a pair of mandibles, a pair of maxillae and a labium (lower lip). Mandibles are present on most insects and are the bits that break the food into smaller pieces so that the insect can push it into its throat.
The respiratory system consists of a tracheal network that opens across ten pairs of small holes called spiracles on the side of the body. Thin tubes or tracheal tubes carry oxygen from the air to all sections. The opening of the spiracles is controlled by the sphincters.

Thus, the correct answer is option B i.e., Spiracles.

Note:Owing to their open circulatory system and the fact that they breathe from tiny holes in each of their body parts, cockroaches do not rely on the mouth or the head to breathe. They can spread a number of bacterial diseases by contaminating food materials.