CBSE Class 9 Answered
Are tetrabalstic organisms there?
Asked by Padmavathitamalampudi | 11 Dec, 2019, 06:07: PM
Expert Answer
- A body plan of an animal shows only the most fundamental arrangement of the tissue layers. The more tissue layers, and the presence of a coelom the more complex the animal. There are as such 3 tissue layers- endoderm, mesoderm and ectoderm.
- Accordingly, there are two types of organisms-
- Diploblastic: An animal possessing 2 major tissue layers. These include the outer layer (the ectoderm) and the inner layer (the endoderm).
- Triploblastic: An animal possessing 3 major tissue layers. It has a middle layer (the mesoderm), between the endoderm and the ectoderm.
- Animals with four tissue layers do not exist. Hence, there are no tetrablastic organisms.
Answered by Sheetal Kolte | 12 Dec, 2019, 11:01: AM
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