Component 3.3 - Nutrition In Multicellular Organisms

Question 1

How do hydra feed?

Answer 1

1) Its tentacles sting and paralyse prey.
2) The tentacles move the prey through the mouth into the hollow food cavity.
3) Cells secrete ensymes and the prey is digested extracellularly.

Question 2

What happens to the products of digestion and indigestible remains in a hydra?

Answer 2

Products of digestion are absorbed into cells and the indigestible remains are egested though the mouth.

Question 3

Describe the gut of a hydra

Answer 3

Undifferentiated, sac-like structure with a single opening