Question:
Digestion is both extracellular and intracellular in:
Digestion is both extracellular and intracellular in:
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Cnidaria are the only group showing dual mode digestion.
Updated On: Jun 20, 2026
- Cnidaria
- Platyhelminthes
- Nemathelminthes
- Mollusca
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The Correct Option is A
Solution and Explanation
Step 1: Understanding digestion types.
Digestion in animals can occur extracellularly (outside cells) or intracellularly (inside cells).
Step 2: Intracellular digestion.
Food particles are engulfed into cells and digested inside food vacuoles.
Step 3: Extracellular digestion.
Digestive enzymes are secreted into a cavity where food is broken down outside cells.
Step 4: Dual digestion in Cnidaria.
Cnidarians like Hydra show extracellular digestion in the gastrovascular cavity and intracellular digestion in endodermal cells.
Step 5: Evaluating options.
- Platyhelminthes: mostly intracellular digestion.
- Nemathelminthes: complete digestive tract, mainly extracellular.
- Mollusca: extracellular digestion only.
Step 6: Final conclusion.
Therefore, Cnidaria show both extracellular and intracellular digestion.
Digestion in animals can occur extracellularly (outside cells) or intracellularly (inside cells).
Step 2: Intracellular digestion.
Food particles are engulfed into cells and digested inside food vacuoles.
Step 3: Extracellular digestion.
Digestive enzymes are secreted into a cavity where food is broken down outside cells.
Step 4: Dual digestion in Cnidaria.
Cnidarians like Hydra show extracellular digestion in the gastrovascular cavity and intracellular digestion in endodermal cells.
Step 5: Evaluating options.
- Platyhelminthes: mostly intracellular digestion.
- Nemathelminthes: complete digestive tract, mainly extracellular.
- Mollusca: extracellular digestion only.
Step 6: Final conclusion.
Therefore, Cnidaria show both extracellular and intracellular digestion.
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