Which of the following animals exhibits only | vedclass

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(B) Extracellular digestion refers to the process where enzymes are secreted into a cavity or lumen outside the cells to break down food. In $Hydra$ (

Vedclass · Accepted Answer

Earthworm

Vedclass · Answer

(B) Extracellular digestion refers to the process where enzymes are secreted into a cavity or lumen outside the cells to break down food. In $Hydra$ (Phylum $Cnidaria$), digestion is both extracellular and intracellular. In $Earthworm$ $(Pheretima)$, $Cockroach$ $(Periplaneta)$, and $Pearl$ $oyster$ $(Pinctada)$, the digestive system is complete with a well-developed alimentary canal. These organisms exhibit exclusively extracellular digestion within the lumen of the digestive tract. However, among the given options, $Hydra$ is the one that performs intracellular digestion as well. Therefore, $Earthworm$, $Cockroach$, and $Pearl$ $oyster$ all exhibit extracellular digestion. Given the standard context of such questions, $Earthworm$ is the most common example of an organism with a complete digestive tract and extracellular digestion.

Column $X$	Column $Y$
$(1)$ Aves	$(A)$ Endoskeleton made of cartilage
$(2)$ Amphibia	$(B)$ Left aortic arch
$(3)$ Chondrichthyes	$(C)$ First homeothermic animals
$(4)$ Mammalia	$(D)$ Metamorphosis

Which of the following animals exhibits only extracellular digestion?

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Select the correct match for Column $X$ and Column $Y$:
Column $X$ Column $Y$
$(1)$ Aves $(A)$ Endoskeleton made of cartilage
$(2)$ Amphibia $(B)$ Left aortic arch
$(3)$ Chondrichthyes $(C)$ First homeothermic animals
$(4)$ Mammalia $(D)$ Metamorphosis

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