Do Porifera have true tissues?

Do Porifera have true tissues?

• A. Yes
• B. No
• C. They have Pseudotissues
• D. They have Nerve Tissue

Answer: (B)

Sponges lack true tissues because a tissue is a coordinated, layered group of cells that functions together and typically forms organized layers or organs derived from embryonic germ layers. In Porifera, the body is built from different cell types—pinacocytes on the outside, choanocytes lining the inner chambers, and amoeboid cells in the gelatinous mesohyl—but there are no organized tissue layers or true organs. The cells can migrate and switch roles, which shows cellular-level organization rather than tissue-level organization. They also do not have nerve or muscle tissues. So, the correct answer is that they do not have true tissues.

Sponges lack true tissues because a tissue is a coordinated, layered group of cells that functions together and typically forms organized layers or organs derived from embryonic germ layers. In Porifera, the body is built from different cell types—pinacocytes on the outside, choanocytes lining the inner chambers, and amoeboid cells in the gelatinous mesohyl—but there are no organized tissue layers or true organs. The cells can migrate and switch roles, which shows cellular-level organization rather than tissue-level organization. They also do not have nerve or muscle tissues. So, the correct answer is that they do not have true tissues.