Question

Differentiate between male and female cockroaches on the basis of external morphology.

Answer 1

Hint: The external appearance (shape, structure, color, pattern, size) is commonly referred to as external morphology, and the shape and structure of internal parts such as bones and organs are referred to as internal morphology.

Complete answer:
The external morphological differences between male and female cockroach are given below -

Male Cockroach	Female Cockroach
A male cockroach is smaller in size.	A female cockroach is bigger than a male cockroach.
Male cockroach wings are bigger. It stretches out beyond the abdomen.	The female cockroach’s wings are smaller. It extends to the tip of the abdomen.
The male cockroaches' antennae are smaller than the females'.	The antennae are relatively bigger than males'.
There are Anal styles.	There are no anal styles.
The male cockroach abdomen is slender.	The female cockroach's abdomen is shaped like a boat and is blunt.

Additional Information:
The morphology in Male Cockroach:
There are testes and accessory organs. The mesothorax sternum doesn't bifurcate. Brood pouch is not present. A pair of thin, unjoined anal styles are present in the 9th abdominal sternum, and pair of long, palp-like jointed anal cerci are present in the 10th abdominal tergum.
The morphology in Female cockroach:
There are ovaries and secondary organs. The mesothorax sternae is bifid. There is a brood pouch present in them.
In female cockroach only a pair of anal cerci is present.

Note: Cockroaches are pests that inhabit unhygienic and humid places. They are dark brown and belong to the Arthropoda phylum, family Blattidae, and class Insecta. Eidonomy is the study of external morphology, and anatomy is the study of internal morphology.