Question

The head of cockroach lacks
(a) Cardo
(b) Gena
(c) Trochanter
(d) Frons

Answer 1

They are a small segment upon which large muscles of the coxa and body wall insert. They articulate with the femur at the trochanter-femoral joint. The cockroach body is divided into three segments which are head, thorax, and abdomen.

Complete answer:
The head of the cockroach lacks a trochanter. The cockroach leg is articulated with its thoracic segment by a stout flattened, basal coxa, followed by a smaller triangular trochanter. The latter is combined with a strong spiny femur, come after by a slender spiny tibia, which is the longest part of the leg. It is followed through the tarsus, which comprises five very small, movable podomeres or tarsomeres having minute hairs.
Cardo: It is the basal segment that connects the head cavity of the cockroach to its secondary jaws. It is also referred to as the maxillae.
Gena: The cheek or gena forms the sclerotized area on all sides of the top below the compound eyes expanding to the gular suture. Like most of the other parts forming the insect's head, the gena varies among species, with its edges tough to decide.
Frons: The Frons is a part of the top capsule that is located in the ventral or anterior of the vertex. The Frons varies in size relative to the insect, and in many species, the definition of its borders is bigoted, even in some insect taxa that have well-defined head capsules.

So, the correct answer is ‘Trochanter’.

Note:
Cockroaches are insects of the order Blattodea, occasionally known as Blattaria. There are around 30 species out of 4,600 total are connected to human habitats. They have six legs. About four species are well known as pests. Cockroaches live in a large range of environments around the world. Pest species are modified easily to a spread of environments but favor warm conditions present within buildings. Many tropical species prefer even warmer environments. Cockroaches are mainly nocturnal and can run away when exposed to light.