Phylum Annelida

Question 1: Write two special characteristics of annelids.

Answer: 

• They respire through their body surface
• Nephridia are excretory organs.

Question 2: What are the examples of annelids?

Answer:

Pheretima(Earthworm), Nereis, and Hirudinaria (Bloodsucking leech) are some of the examples of annelids.

Question 3: Define the term Setae.

Answer:

 A bristle or hair in many invertebrates. Setae are produced by the epidermis.

Question 4: Why earthworms are known as the friend of farmers?

Answer: 

Because the earthworms improve the fertility of the soil in different ways and, therefore, they are of utmost importance in agriculture.

Question 5: Name the first animal to acquire true coelom.

Answer:

Annelids are the first animal to acquire true coelom.

Animals have definite shapes and sizes. They are unbranched except for the sponges. Animals’ organs are generally internal, e.g., liver, heart, kidney, lungs, brain, stomach, etc. The growth of an animal’s body is limited, and it stops long before death. The growth regions are not localized. They can move bodily from one place to another. They lack chlorophyll and are heterotrophic in their mode of nutrition. Animals have distinct excretory organs. Asexual reproduction occurs only in the lower animals. Animals are classified according to some basics like the number of germ layers present in the embryo; the symmetry of the body of the organism, mode of origin of mouth. The broad classification of Animalia is based on common fundamental features. The phyla of the animal kingdom are Porifera, Cnidaria, Ctenophora, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca, Echinodermata, Hemichordata, and Chordata. Hereunder is a detailed explanation of the phylum Annelida.