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Questions and Answers
What is a primary feature of sponges in terms of their structural organization?
What is a primary feature of sponges in terms of their structural organization?
- They possess organ systems.
- They exhibit bilateral symmetry.
- They have a cellular level of organization. (correct)
- They have a ganglion or nerve net.
How do sponges primarily gather food?
How do sponges primarily gather food?
- By photosynthesis like plants.
- Via a water transport system. (correct)
- Through active predation.
- By the presence of tentacles.
Which of the following statements about sponge reproduction is true?
Which of the following statements about sponge reproduction is true?
- Sponges only reproduce asexually.
- Fertilization in sponges is always external.
- Sponges reproduce sexually and asexually. (correct)
- Sponges are dioecious.
What is the function of choanocytes in sponges?
What is the function of choanocytes in sponges?
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What type of fertilization occurs in sponges?
What type of fertilization occurs in sponges?
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Study Notes
Porifera - Sponges
- Porifera are commonly known as sponges.
- Vast majority are marine organisms.
- They lack symmetry.
- They are considered primitive multicellular animals.
- Their organization is at the cellular level.
- Porifera have a water transport or canal system for:
- Food gathering
- Gas exchange
- Waste removal
- Water enters through small pores called ostia and exits through the osculum.
- Choanocytes, or collar cells, line the spongocoel and canals.
- Digestion is intracellular.
- Sponges have a skeleton made up of spicules or spongin fibers.
- They reproduce asexually through fragmentation.
- They reproduce sexually through gamete formation.
- Fertilisation is internal.
- Development is indirect with a larval stage that is morphologically distinct from the adult.
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