16. In large animals, digestion occurs ------ A) Extracellularly, within a gastr

Question

16. In large animals, digestion occurs ------ A) Extracellularly, within a gastrovascular cavity. B) Extracellularly, within a cavity that is open at both ends. Cintracellular, through simple absorption D) Intracellular, through collar cells. 17. Which of the following is true of hydra, which has a gastrovascular cavity? A) Digestion is exclusively intracellular. B) Ingestion and elimination occur through a single opening. C) Digestion is unnecessary because of the small size of the particles absorbed. D) Absorption occurs within collar cells. 18. Waves of muscular contractions that propel the contents of the digestive tract are called --- A) pendular movements. B) Peristalsis. C) Segmentation. D) Mass contraction

Explanation / Answer

16) The correct option is B. Extracellularly, within a cavity that is open at both ends.

The process of digestion occurs extracellularly, within a cavity that is open at both ends in most of animals.

17) The correct option is B. Ingestion and elimination occur through a single opening.

Hydra is a cnidarian. In cnidarians, the gastrovascular system is called as the coelenteron. Food enters, and waste exits through the same opening in gastrovascular cavity of hydra.

18) The correct option is B. Peristalsis.

The process of peristalsis is a series of wave muscle contractions. It moves food to different processing places in the digestive tract.

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