Question

Define the terms and give one example of each. [3 MARKS]

a. Bilateral symmetry
b. Coelom
c. Triploblastic

Answer 1

Definition : 1.5 Marks
Examples : 1.5 Marks

a. Bilateral symmetry involves the division of the animal through a sagittal plane, resulting in two mirror-image, right and left halves. Examples: butterfly, crab, or humans.

b. A coelom is fluid-filled body cavity that is completely lined by tissue created from the mesoderm, the middle layer of the primary cells found in an embryo. Example: Vertebrates.

c. Triplobalstic condition is having the three germ layers formed during the early embryo through the process of gastrulation. There are three types of germ layers they are ectoderm, mesoderm, and endoderm. Example : Annelida, Mollusca etc.