This about Periplaneta americana is incorrect

The correct option is "Hemolymph delivers oxygen to tissues".

Let us break down why this statement is incorrect (making it the correct option for this question) and analyze the other options for Periplaneta americana (the American cockroach) step-by-step:

1. Understanding the Respiratory System of Cockroaches:
In Periplaneta americana, respiration occurs through a network of tubes known as the tracheal system. Air enters the body through lateral openings called spiracles and travels through tracheal tubes to tracheoles, which carry oxygen directly to the body cells and tissues. Unlike vertebrates or some other invertebrates, the circulatory fluid (hemolymph) of a cockroach lacks respiratory pigments (like hemoglobin) and does not play a role in transporting oxygen. Therefore, the statement "Hemolymph delivers oxygen to tissues" is incorrect.

2. Why the other options are correct statements:
• Mosaic vision: Cockroaches possess compound eyes made up of about 2000 individual units called ommatidia. These units receive several images of an object, creating a mosaic vision which has high sensitivity but low resolution.
• Excretion by structures – malpighian tubules: In cockroaches, excretion is performed by malpighian tubules. These tubules absorb nitrogenous waste products from the hemolymph and convert them into uric acid, which is excreted out.
• Paurometabolous development: The development of Periplaneta americana is paurometabolous, meaning they undergo gradual metamorphosis through a series of nymphal stages before reaching the adult form.