EVERYDAY SCIENCE

Detailed explanation-1: -Between the ectoderm and endoderm layer, a layer of undifferentiated cells is present known as mesoglea. Such pattern of embryonic layers is seen in the diploblastic animals. Therefore, Hydra is referred to as a diploblastic animal.

Detailed explanation-2: -Hydra are invertebrate freshwater organisms with a tubular body. They belong to the phylum Cnidaria. They have a diploblastic body plan and show the presence of two embryonic layer outer ectoderm and inner endoderm. Thus the correct answer is option A.

Detailed explanation-3: -In Hydra, the cells are arranged in two germinal layers-outer ectoderm and inner endoderm. Between these two layers is a layer of undifferentiated cells called mesoglea. Such kind of pattern of embryonic layers is seen in diploblastic animals. Hence, the hydra is a diploblastic animal.

Detailed explanation-4: -The jellyfish, comb jellies, and sea anemones are diploblastic in nature.