Question

puzzle #6 - survival of a sponge

1. true or false: most sponges are filter - feeders, but a few are carnivores.

a. true
b. false

1. which are suitable food sources for filter - feeding sponges?

a. small mollusks and crustaceans
b. seaweed, sea anemones, and other sponges
c. they don’t need food – they complete photosynthesis
d. sand, rocks, water
e. plankton, bacteria, detritus

1. which cell is not involved in the feeding process of a sponge?

a. choanocyte
b. sclerocyte
c. porocyte
d. amoebocyte

1. which is true of sponges?

a. sponges do not need any oxygen to survive
b. sponges need high concentrations of oxygen and obtain it through their gills
c. sponges need low concentrations of oxygen and obtain it through their gills
d. sponges need high concentrations of oxygen and obtain it by diffusion
e. sponges need low concentrations of oxygen and obtain it by diffusion

1. if there is a high concentration of a certain gas in a sponge and a low concentration in the water, what will happen according to simple diffusion?

a. the gas will diffuse out of the sponge and into the water
b. the gas will diffuse from the water and into the sponge
c. nothing will happen – sponge skin is too thick for diffusion

1. what is the function of the excretory system?

a. sense, understand, and respond to the environment
b. bring oxygen into the body
c. pump nutrients through the body
d. remove waste from the body

1. what structure does a sponge use to perform excretion?

a. ostia
b. osculum
c. holdfast
d. porocytes

1. what is something that a sponge cannot sense?

a. sounds
b. light
c. chemicals
d. temperature
e. flow rate
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Explanation:

1. Most sponges are filter - feeders, and some are carnivores.
2. Filter - feeding sponges eat plankton, bacteria, and detritus.
3. Sclerocytes form spicules and are not involved in feeding.
4. Sponges need low oxygen and get it by diffusion.
5. Gas diffuses from high to low concentration, so it will diffuse out of the sponge.
6. The excretory system removes waste.
7. Sponges use the osculum for excretion.
8. Sponges lack structures to sense sounds.

Answer:

1. A. True
2. E. Plankton, bacteria, detritus
3. B. Sclerocyte
4. E. Sponges need low concentrations of oxygen and obtain it by diffusion
5. A. The gas will diffuse out of the sponge and into the water
6. D. Remove waste from the body
7. B. Osculum
8. A. Sounds