Question

Which one is (a) Diploblastic and (b) Triploblastic.
Hydra, centipede (Scolopendra), Liver fluke(fasciola),Earthworm (pheretima posthuma).
(a) Diploblastic-Hydra, centipede (Scolopendra) ; Triploblastic-Liver fluke, earthworm
(b) Liver fluke, centipede, Earthworm; Triploblastic-Hydra
(c) Diploblastic- Hydra; Triploblastic- centipede, liver fluke, the earthworm.
(d) Diploblastic- Hydra, Earthworm; Triploblastic-centipede, liver fluke.

Answer 1

Hint: Animals can be divided in terms of the number of germ layers. The germ layer classification includes diploblastic and triploblastic.

Complete answer:
Diploblastic can be defined as the condition of the blastula during which there are two primary germ layers: the ectoderm and endoderm. Diploblasty is a condition that has 2 germ layers endoderm and ectoderm separated by a mesoglea which is a non-differentiable layer.
Triploblasty may be a condition of the blastula during which there are three primary germ layers: the ectoderm, mesoderm, and endoderm. Examples: Fasciola hepatica, Centipede, Earthworm, etc.

DiploblasticThe cells are arranged in 2 embryonic layers called external ectoderm and an internal endoderm.Mesoglea is present between ectoderm and endoderm.Examples are cnidaria and Ctenophora.

TriploblasticThe cells are arranged in 3 embryonic layers called the outer ectoderm, middle mesoderm, and inner endoderm.Here, mesoglea is absent.Examples -Platyhelminthes to Chordata.

So the answer is ‘diploblastic-Hydra; Triploblastic-Earthworm, liver fluke, and centipede.’

Note: The neural crest is sometimes considered to have a fourth germ layer but it is derived from the ectoderm.
-The endoderm produces the tissues that are within the lungs, thyroid, and pancreas.
-The mesoderm is involved in the formation of many muscles like that of cardiac muscle, skeletal muscle, smooth muscle, tissues within the kidneys, and red blood cells.