Lake Regions

Question 1

Littoral zone

Answer 1

shallow region next to shore where light penetrates to bottom; rooted macrophytes; subject to waves, ice grinding, temperature fluctuations, coarse sediments

Question 2

Sublittoral zone

Answer 2

extends lakeward from littoral; finer sediments; less biodiversity due to fewer niches

Question 3

Profundal zone

Answer 3

deep, dark, cold region

Question 4

Pelagic zone

Answer 4

open water region; dominated by phytoplankton

Question 5

Trophogenic zone

Answer 5

upper region of lake with sufficient light for photosynthesis to occur; primary producers fix organic carbon and make organic compounds (also called euphotic zone)

Question 6

Tropholytic zone

Answer 6

deeper water where light is insufficient for photosynthesis; respiration and decomposition predominate (also called aphotic zone)