Figure 28.3 Which of the following statements is
false?
- Choanocytes have flagella that propel water through the body.
Introduction:
Generally, sponges do not show true tissue-layer organization and do not have a number of functional tissues, that made up of different cell types specialized for distinct functions such as pinacocytes Pinacocytes is epithelial-like cells and form the outermost body, called a pinacoderm, that serves a protective function similar to the epidermis. Pinacoderm scattered among all area of Ostia that allow entry of water into the body of the sponge.
Answer to Problem 1VCQ
Correct answer:
Correct answer is option (b), Pinacocytes can transform into any cell type.
Explanation of Solution
Explanation/justification for the correct answer:
Option (b) is given as Pinacocytes can transform into any cell type. Pinacoderm scattered among all area of ostia that allow entry of water into the body of the sponge. In some sponges, ostia are made up of porocytes, these single tube-shaped cells act as valves to regulate the flow of water into the spongocoel. It is a correct answer.
Explanation for the incorrect answer:
Option (a) is given as choanocytes have flagella that propel water through the body. Choanocytes line is the inner portions of spaces in the sponges that allow the flow of water. The water current is maintained through the presence of flagella so that food particles can be trapped and ingested via phagocytosis. It is a wrong answer.
Option (c) is given as lymphocytes secret collagen. Lophocytes is a specific type of cells in sponges that able to produce protein like collagen for maintenance of mesophyll. it is a wrong answer.
Option (d) is given as porocytes control the flow of the water through pores in the sponge. Porifera is a phylum that cover sponges that pore-bearers, in some sponges, porocytes make ostia like single tube-shaped cells that act as valves and help to regulate the flow of water into the spongocoel. it is a wrong answer.
Thus, Pinacocytes can transform into any cell type is a false statement.
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Chapter 28 Solutions
Biology 2e
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