Question

Define the terms diploblastic, triploblastic, bilateral symmetry, coelom, pseudocoel to unisexual.​

Answer 1

1. diploblastic - 2 germinal layer
2. triploblastic - 3 germinal layer
3. Bilateral Symmetry: Bilateral (two-sided) symmetry is the most common form of symmetry possible, and it is found throughout the biological and non-biological world. Animals possessing bilateral symmetry have a dorsal (top) side, a ventral (bottom ) side, an anterior (head) end, a posterior (tail) end, and a distinct left and right side. Associated with bilateral symmetry is the phenomenon of cephalization, which is the evolutionary trend towards the concentration of sensory equipment on the anter ior end; this means that such organisms are directionally sensitive and mobile. Generally the anterior, or cephalized, end is the first to encounter food, danger, or other stimuli. Before bipedal development (common in humans and apes), cephalization wa s an adaptation for movement such as crawling, burrowing, or swimming. Examples of animals that possess bilateral symmetry are: flatworms, common worms ("ribbon worms"), clams, snails, octopuses, crustaceans, insects, spiders, brachiopods, sea stars, sea urchins, and vertebrates.

Answer 2

Answer:

diploblastic- having two layers

trophoblastic - having 3 layer

coelum- it fills the space between 3 or 2 layers

pseudocoel -having two leg

bilateral symmetry - for example is we cut one human being vertically equal than it divides into 2 equal parts equal nose,equal mouth ,equal leg and so on but if we cut horizontally then it will not be equall so,the equal division is only possible vertically .this type of division is called bilateral symmetry ( only two parts will be equal) and it's opposite is radical summetry if we cut an organism like star fish from anywhere it will give equal shape .