Question

Read the statements carefully from a top:

(a) Second largest phylum
(b) Chitinous exoskeleton
(c) Solid, ventral nerve cord
(d) Radial symmetry
(e) Closed circulatory system

How many statements are incorrect for Arthropoda phylum?

• A. One
• B. Two
• C. Three
• D. Four

Answer 1

The correct option is B Two

(a) The first largest Phylum Arthropoda and the second is Phylum Mollusca.

(b) Arthropods are covered by an exoskeleton of chitin which supports and provides protection.

(c) Arthropods have a paired set of nerve cords known as ventral nerve cords, i.e, they run along the stomach region which is solid and double (they have a double row of ganglia connected longitudinally).

(d) Arthropods can be divided into two identical halves (right half is a mirror image of its left half) this is called bilateral symmetry.

(e) Arthropods lack blood vessels i.e they do not have veins and arteries, their heart pumps blood directly into the body cavity and the organs are bathed. This type of circulatory system is called an open circulatory system.

• So, the correct answer is 'Two'.