Green glands, or antennal glands, are excretory organs of many crustaceans. They help regulate salts and remove wastes in aquatic environments. This MCQ belongs to the Crustacea topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Malpighian tubules are excretory organs of insects and many terrestrial arthropods. They help remove wastes while conserving water, often producing uric acid. This MCQ belongs to the Arthropoda topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Compound eyes consist of many ommatidia and are common in arthropods, especially insects and crustaceans. They are useful for detecting movement and wide visual fields. This MCQ belongs to the Arthropoda topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Crustaceans typically have two pairs of antennae and many possess biramous appendages. They are mostly aquatic arthropods, although some groups are terrestrial. This MCQ belongs to the Crustacea topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Arachnids, including spiders and scorpions, usually have four pairs of walking legs and no antennae. Their body is often divided into cephalothorax and abdomen. This MCQ belongs to the Arachnida topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Insects have three pairs of legs attached to the thorax, along with a body divided into head, thorax, and abdomen. This separates them from arachnids and crustaceans. This MCQ belongs to the Insecta topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Most arthropods have an open circulatory system. Hemolymph is pumped by a heart into spaces of the hemocoel where it directly contacts tissues. This MCQ belongs to the Arthropoda topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Tagmatization is the grouping of segments into specialized body regions called tagmata. It is a major reason for arthropod functional diversity. This MCQ belongs to the Arthropoda topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Ecdysis is the process of molting the exoskeleton. It is essential for growth in arthropods and other ecdysozoans such as nematodes. This MCQ belongs to the Arthropoda topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Arthropods have a chitinous exoskeleton that protects the body and provides muscle attachment. Because it is rigid, growth requires periodic molting or ecdysis. This MCQ belongs to the Arthropoda topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Jointed appendages are a defining feature of arthropods. They allow efficient locomotion, feeding, sensing, reproduction, and many other specialized functions. This MCQ belongs to the Arthropoda topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Correct Answer: B. Nereis as a polychaete representative
Explanation:
Nereis is a common polychaete annelid representative. Its parapodia and numerous setae make it useful for studying polychaete structure. This MCQ belongs to the Annelida topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.