Question

Invertebrates with jointed legs belongs to the phylum
A. Protozoa
B. Porifera
C. Annelida
D. Arthropods

Answer 1

Hint: The kingdom animalia is divided into two groups named vertebrates and invertebrates. The vertebrates are the organisms comprising the back bone or skeleton while invertebrates lack the back bone.

Complete Answer:
- Invertebrates are the animals that do not have bone skeleton or backbone. They cover the animals that are microscopic mites and invisible flies to large squid. It is considered as the largest group of animal kingdom that is, about 97 percent of all the animals are invertebrates.
- Now, the invertebrates with jointed legs belong to the phylum arthropods. Let’s understand about the arthropods in detail. The organisms of the phylum arthropods have tough exoskeletons, segmented bodies with jointed legs.
- The exoskeleton is the outer covering found in insects that protect the outer surface of the organism and maintain the muscle attached with it. The organism of phylum vertebrates consists of endoskeletons that mean they consist of skeletons inside the body that give the body its structure by holding the organs and protecting them. It consists of mineralized tissue that enables the muscle movement attached with it.
- The arthropods are divided into groups according to the body segment, mouthparts, and appendages of their body. The groups include crustaceans, spiders and their relatives, and insects and their relatives.
- The crustaceans have two pairs of antennae, mandibles, two compound eyes, five pairs of legs, and they are swimmers. The spiders and their relatives do not have antennae, six pairs of legs, and two body sections. The insects and their relatives have antennae, three pairs of legs, and three body areas.

Thus, the correct option is ‘D’. Arthropods.

Note: Porifera are the group of organisms that comprises of pores in their body to control the osmoregulation, they undergo asexual reproduction and do not have jointed legs. Annelida are the organisms that cover all the worms, they have segmented bodies and do not have jointed appendages.