The animal cells are arranged in two embryonic layer and one undifferentiated layer that is called _____________.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. mesoglea.
Mesoglea. In diploblastic animals, such as Cnidarians (Hydra, Jellyfish, Corals), the body wall is made up of two embryonic layers — the ectoderm (outer layer) and the endoderm (inner layer). Between these two layers lies a non-cellular, jelly-like layer called mesoglea, which provides structural support and flexibility. It helps in maintaining the shape and buoyancy of the animal.
Other options:
-
Endoderm is the inner germ layer that forms internal organs like the gut.
-
Ectoderm is the outer layer that develops into the epidermis and nervous system.
-
Protoderm is a plant term, referring to the outermost layer of cells in the developing plant embryo, not used in animals.