Question

Character common in spider , cockroach and centipede is
A. Compound eyes
B. Book lungs
C. Green glands
D. Jointed legs

Answer 1

Hint: Arthropods, including insects , spiders, centipedes, millipedes and crustaceans, are members of the taxonomic phylum Arthropoda.As they do not have a vertebral column (backbone), insects are invertebrates. They have a rigid outer shell, called an exoskeleton, instead. They have six legs and two antennas, and there are three major regions in their bodies: the back, the thorax, and the abdomen.

Complete Answer:
- It is possible for many insects to fly and most have compound eyes. Typically, they have four distinct phases of life: embryo, larvae or nymph, pupa, and adult.
- In Catoctin Mountain Park, spiders, mites and ticks are all arachnids that can be found. Arachnids have eight legs and no antennae or wings, unlike insects. Centipedes are long , slender arthropods with one pair of legs per segment of the body.
- Centipedes have anywhere from less than 20 legs to over 300 legs, despite the "centi" in their name, which means 100 legs, but they still have an odd number of leg pairs.
- Compound eyes are referred to as arthropod eyes because they consist of repeating units, the ommatidia, each of which serves as a separate visual receptor. Spiders have no compound eyes, while cockroaches have centipedes-like compound eyes.
- A book lung is a type of breathing organ found in many arachnids, such as scorpions and spiders, used for atmospheric gas exchange.
- Green glands-one of the pairs of decapod crustaceans excretory organs on either side of the head, emptying at the base of the antennae.
- Jointed legs are a common character in the spider, cockroach, and centipede, as all of these belong to Phylum Arthropoda.

The correct Answer is option (D) Jointed legs.

Note: Insects constitute about 90% of all life forms on earth and are creatures that are extremely adaptable. Worldwide, more than one million species of insects have been described, and some entomologists (scientists who research insects) believe that as many as 10 million species could exist.