Question

consider following features
a) Organ system level of organisation
b) Bilateral symmetry
c) True coelomates with segmentation of body

Select the correct option of animal groups which possess all the above characteristics
A. Annelida, Arthropoda and Chordata
B. Annelida, Arthropoda, and Mollusca
C. Arthropoda, Mollusca and Chordata
D. Annelida, Mollusca and Chordata

Answer 1

Annelids are segmented worms such as earthworm. Arthropods are insects and crustaceans. Mollusca have lateral connections like in snails. Chordates have notochords.

Complete answer:
Segmentation: These types of animals are those who are considered to have organs that were repeated or to have a body composed of self -similar units. It is the part of an organism which is known as being segmented. The various segments in their body have a specialized function to perform. Without segmentation they could lose their ability to move and would not have advanced functions. It saves them from danger. Segmented body is a distinguishing feature to this group. Coelom (body cavity is a body cavity present between the body wall and gut wall.
-Segmented organisms with Coelomates are Annelids, Arthropoda and chordata.
-Symmetry body means that when any plane passes through the body it can divide the body into two equal halves. Bilateral symmetry is the body which can be divided into identical left and right halves in only one plane. It produces only two sides along its sagittal plane as left and right Sagittal plane splits the body into right and left sides., Analogous body parts are arranged equally on both the right and left sides. Bilateral symmetry is in Annelids, Arthropoda, Mollusca and chordate.
-Organ level of organisation is in the animals where organs are linked to produce functional systems where each system has specific physiological functions which lead to organ system level of organization. Organs like cardiovascular lymphatic, digestive, Endocrine etc. are found in some animals with organ level organisation Examples: Annelids, Arthropods, Mollusca and chordate.

Hence, the correct answer is option (A).

Note: Kingdom Animalia consists of ten phyla in which all the phylum consists of multicellular eukaryotic organisms having a heterotrophic mode of nutrition. The different phyla are Porifera, Coelenterata, Nematoda, Annelida, Arthropoda, Mollusca, Hemichordata and Vertebrata.