ANIMAL PHYSIOLOGY
DIGESTION IN DIFFERENT ANIMALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Digestive chamber with a single opening
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The simplest animals, such as sponges, digest food inside specialized cells that pass nutrients to other cells by diffusion
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Process in which food is broken down outside cells in a digestive system and then absorbed
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Stomach chambering cows and related animals in which symbiotic bacteria digest cellulose into usable protein.
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Detailed explanation-1: -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.
Detailed explanation-2: -The sort of digestion where food is directly taken into the cells and digested within the cell is called as intracellular digestion. It occurs in unicellular organisms like amoeba.
Detailed explanation-3: -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.
Detailed explanation-4: -Sponges are efficient filter feeders that use almost exclusively intracellular digestion.