Multiple Choice
Despite long days grazing on tall grasses, several of the cattle released into a new pasture have oddly shaped or broken legs and often lie down. These cattle might be suffering from __________.
39. Digestive System
Digestion
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Which of the following animals uses only intracellular digestion?
A
Earthworm
B
Hydra
C
Human
D
Flatworm
E
Sponge
Verified step by step guidance1
Understand the difference between intracellular and extracellular digestion. Intracellular digestion occurs within cells, while extracellular digestion occurs outside cells, typically in a digestive cavity.
Identify the characteristics of sponges. Sponges are simple animals that lack a digestive system and rely on intracellular digestion.
Recognize that sponges use specialized cells called choanocytes to capture and digest food particles within their cells.
Compare this with other animals listed: Earthworms, hydras, humans, and flatworms all have some form of digestive cavity or system for extracellular digestion.
Conclude that sponges are the only animals in the list that rely solely on intracellular digestion, as they do not have a digestive cavity.
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