SCIENCE
ZOOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Choanocytes
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Tissues
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Pinacocytes
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Mesohyl
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Detailed explanation-1: -So, the correct answer is ‘Spongocoel’.
Detailed explanation-2: -The sponges lack a well-defined organization of tissues. Single layers of cells line the outer surface of the body and the internal cavities; other cells, both motile and fixed, and fibres occur in an amorphous substance (mesohyl), gelatinous in nature.
Detailed explanation-3: -So, the correct answer is ‘Nerve cells’.
Detailed explanation-4: -Although sponges do not have organized tissue, they depend on specialized cells, such as choanocytes, porocytes, amoebocytes, and pinacocytes, for specialized functions within their bodies.
Detailed explanation-5: -incurrent pores-ostia (sing. ostium) excurrent openings-oscula (sing. osculum) (tree sponge photo) spongocoel. skeletal elements-protein and spicules (see diagrams in web article)