Question

42. Whether an animal is classified as a member of Radiata or Bilateria is based on:

Choose all that apply

presence or absence of true tissues.

presence or absence of sexual reproduction.

type of body symmetry.

number of tissue layers in the embryo.

presence or absence of an exoskeleton or cuticle shed for growth.

Answer 1

Answer: type of body symmetry. and number of tissue layers in the embryo

Animals are classified on the basis of their body symmetry and the number of germ layers they have.

Radiata are the organisms that show radial symmetry i.e. their body parts are along the main longitudinal axis of the body and they are diploblastic i.e. they have two germ layers(ectoderm and endoderm) while Bilateria are the organisms that have bilateral symmetry i.e. all the body parts are arranged in a way that body can be divided into two equal halves and they are triploblastic i.e. they have three germ layers(ectoderm,endoderm, and mesoderm)