Question

Which one is true in reference to sponges(a) Internal fertilization & direct development(b) Indirect development & Internal fertilization(c) External fertilization & indirect development(d) External fertilization & direct development

Answer 1

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The answer is option b

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Answer 2

Usually, sponges undergo internal fertilization and indirect development. Trapped sperm are intermediated to eggs inside the female body, where fertilization takes place internally. Sponges belonging to the family phylum Porifera are basal animals. Sponges are multicellular organisms. They have radial symmetry. Their respiratory tract system depends upon their diffusion .