Select the INCORRECT statement about Phylum Arthropoda.
Arthropods possess a closed circulatory system with blood confined to vessels.
The question asks us to identify the INCORRECT statement about Phylum Arthropoda.
Option 1 (Correct answer - the incorrect statement): Arthropods possess a closed circulatory system. This is FALSE. Arthropods actually have an open circulatory system, in which the blood (called haemolymph) is not confined to vessels but flows freely through body cavities called haemocoels, bathing the organs directly.
Why the other statements are correct:
Class Insecta is indeed the largest class of Phylum Arthropoda, containing over a million described species.
Arthropoda is characterized by a hard chitinous exoskeleton and jointed appendages (the name itself means "jointed feet").
Arthropods make up more than 85% of all known animal species, making it the largest phylum in the animal kingdom.
Hence, the statement about a closed circulatory system is the incorrect one.
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