How do porifera digest food?
How do porifera digest food?
Sponges lack complex digestive, respiratory, circulatory, and nervous systems. Their food is trapped as water passes through the ostia and out through the osculum. Bacteria smaller than 0.5 microns in size are trapped by choanocytes, which are the principal cells engaged in feeding, and are ingested by phagocytosis.
What digestion takes place in porifera?
Intracellular digestion is seen in the members of phylum Porifera.
How does method of digestion differ between porifera and cnidaria?
Digestion of the food particle takes place inside the cell. The difference between this and the mechanisms of other animals is that digestion takes place within cells rather than outside of cells. Because of this difference, poriferans do not have a nerve net or muscle cells for locomotion, which cnidarians have.
How do sponges feed and digest food?
Sponges feed by straining food particles from water. As water enters a sponge, Page 2 it carries tiny organisms such as bacteria and protists. Collar cells on the inside of the central cavity trap these food particles and digest them. Sponges are very efficient at removing food particles from water.
Do sponges have sexes?
Most sponges are hermaphrodites (function as both sexes simultaneously), although sponges have no gonads (reproductive organs).
Do choanocytes digest food?
The beating of flagella from all choanocytes moves water through the sponge. Food particles are trapped in mucus produced by the sieve-like collar of the choanocytes and are ingested by phagocytosis. This process is called intracellular digestion.
How many gut openings do Porifera have?
Simple Invertebrate Comparison
|Porifera- Number of digestive openings||food enters many pores and leaves through large opening at the top|
|Cnidaria- Number of digestive openings||food enters and undigested food goes out through one opening|
|Platyhelminthes- Common name||flat worms|
|Platyhelminthes- Body shape||flat|
Do humans have extracellular digestion?
Humans use extracellular digestion when they eat. Their teeth grind the food up, enzymes and acid in the stomach liquefy it, and additional enzymes in the small intestine break the food down into parts their cells can use.
What are the similarities between porifera and cnidaria?
Porifera and Cnidaria are organisms which share similar characteristics with one another. -They are both multicellular, they consist of many cells working together. They are both eukaryotic, they have DNA in the form of chromosomes contained within a distinct nucleus.
What are the special features of porifera and cnidaria?
|1. Animals are asymmetrical.||1. Animals are radially symmetrical.|
|2. Water canal system is well-developed.||2. Water canal system is absent.|
|3. They show the presence of choanocytes or collar cells.||3. They show the presence of cnidoblasts or nematocytes.|
Do sponges have a digestive system?
Lacking a true digestive system, sponges depend on the intracellular digestive processes of their choanocytes for their energy intake. The limit of this type of digestion is that food particles must be smaller than individual cells.
How do sponges defend themselves?
The pointed sponge spicules function as one method of defense against predators. Sponges also defend themselves by producing chemically active compounds. Some of these compounds are antibiotics that prevent pathogenic bacterial infections, and others are toxins that are poisonous to predators that consume the sponge.