Question

Phylum Arthropoda is characterised by:

• A. Chitinous exoskeleton, external segmentation and unpaired appendages
• B. Chitinous exoskeleton and antennae
• C. Chitinous exoskeleton, antennae and compound eye
• D. Chitinous exoskeleton, external segmentation and paired appendages

Answer 1

The correct option is: D

Explanation of the correct option:

Arthropoda is the largest phylum with about nine lakh species. Phylum Arthropoda includes invertebrate animals having a segmented body (with external segmentation), an exoskeleton made up of rigid chitin, and jointed appendages.

Characteristics of Arthropoda

• The body is triploblastic, segmented, and bilaterally symmetrical.
• The body is divided into head, thorax, and abdomen.
• The exoskeleton is made of chitin.
• Their body has jointed appendages which help in locomotion
• They have an open circulatory system.
• The terrestrial Arthropods excrete through Malpighian tubules while the aquatic ones excrete through green glands or coaxal glands.
• The head bears a pair of compound eyes.
• They are unisexual and fertilization is either external or internal.

Explanation of the incorrect option:

Option A: Phylum Arthropoda is characterized by chitinous exoskeleton, external segmentation, and paired appendages

Option B: Phylum Arthropoda is characterized by chitinous exoskeleton, external segmentation, and paired appendages

Option C: Phylum Arthropoda is characterized by chitinous exoskeleton, external segmentation, and paired appendages

Final answer: Phylum Arthropoda is characterized by chitinous exoskeleton, external segmentation, and paired appendages