Which of the following class of Arthropoda have animals with two pairs of antennae and green glands ?

Question

Accepted Answer

Option 1, Crustacea, is the correct answer because members of this class of Arthropoda are characterized by having two pairs of antennae and green glands. Crustaceans include animals such as crabs, lobsters, shrimp, and crayfish. These organisms typically have a hard exoskeleton and are primarily aquatic. The two pairs of antennae are a distinctive feature that helps them in sensory perception and navigation in their environment. Additionally, crustaceans possess green glands, also known as antennal or maxillary glands, which are involved in excretion and osmoregulation.

Now, let's explain why the other options are incorrect:

2. Chilopoda: This class includes centipedes, which are terrestrial arthropods. Chilopods have a single pair of antennae and do not possess green glands. Instead, they are characterized by having one pair of legs per body segment and are known for their predatory behavior.

3. Insecta: Insects are the largest class within the phylum Arthropoda and include animals such as beetles, butterflies, and ants. Insects have a single pair of antennae and do not have green glands. They are distinguished by having three pairs of legs and typically two pairs of wings.

4. Arachnida: This class includes spiders, scorpions, ticks, and mites. Arachnids do not have antennae at all, which sets them apart from crustaceans. They also lack green glands. Arachnids are characterized by having eight legs and a body divided into two main segments: the cephalothorax and the abdomen.

In summary, Option 1, Crustacea, is the correct answer because it is the only class among the options that features animals with two pairs of antennae and green glands, distinguishing them from the other classes of Arthropoda.