Question

Which of the following class of Arthropoda have animals with two pairs of antennae and green glands?
1. Crustacea
2. Chilopoda
3. Insecta
4. Arachnida

Answer 1

Correct Answer - Option 1 : Crustacea

Concept:

• The phylum Arthropoda is the biggest phylum. It comprises two-thirds of all the named species on earth.
• Arthro means ''joints'' and poda means ''appendages'' so most of the arthropods bear joined appendages.
• Their bodies are segmented and an exoskeleton is present, made up of chitin.
• The arthropods can be divided into 6 classes - Crustacea, Chelicerata, Myriapoda, Hexapoda, Trilobitomorpha and, Onychophora.

Explanation:

• Crustaceans exhibit both terrestrial and aquatic habitat, based on the habitat they can respire through gills or trachea.
• The body has two divisions cephalothorax (head + thorax) and abdomen.
• They have two pairs of Antennae, Maxillae, and a single pair of mandibles.
• Antennal glands or Green glands are present for excretion.

• Chilopoda is a subdivision of class Myriapoda. They have each segment with a pair of legs. Eg. Centipede (Poison - claws)
• Insecta is a subdivision of class Hexapoda. Their body is divided into head, thorax, abdomen.
• The Head has one pair of antennae and one pair of compound eyes. Respiration is performed by the trachea and excretion by Malpighian tubules.
• Arachnida also called Octapoda is a subclass of Chelicerata. The Body is divided into the cephalothorax and abdomen. Cephalothorax bears 2 pairs of mouth arts Chelicerae & Pedipali for feeding & 4 pairs of legs.