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Test Bank for Marine Biology: Function, Biodiversity, Ecology 2E - page 34 / 44





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a. Have roots that penetrate into the oxygenated sediment below

b. Must have roots adapted to the anoxic sediment

c. Cannot live in regular sea water

d. Are common in high-latitude estuaries

Chapter 15

Sea grasses such as eel grass

a. Can spread populations only by rhizome extension

b. Are flowering plants that are pollinated by flying insects at the time of low tide

c. Are flowering plants that are fertilized by pollen that is spread by water currents

d. Are flowering plants with self fertilization only

Sea grasses such as eel grass

a. Have their lower depth limited strictly by light

b. Have their lower depth limited by herbivore pressure by fish grazing

c. Can live at great depths, as much as 10 m

d. Cannot grow in soft sediment such as mud because the pore waters lack oxygen

Sea grasses

a. Are always strongly controlled by grazing by herbivores

b. Are rather indigestible so only a restricted number of herbivore species can subsist on them

c. Are digestible by invertebrates but not vertebrates

d. Tend to grow right up to the edge of patch reefs in the Caribbean

In the 1930s

a. Eel grass increased greatly owing to the relaxation of overfishing

b. Eel grass declined owing to sewage

c. Eel grass declined because of a disease

d. Decreasing light caused a decline of eel grass

How does Eel grass affect sedimentation?

a. It slows currents and increases sedimentation

b. Leaves decompose and increase sedimentation of organic material.

c. It encourages the growth of surface algae and seaweeds and increases sedimentation

d. All of the above

Subtidal rocky reefs

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