FRESHWATER ECOSYSTEM

Question 1

it contain standing water, some of
which is too deep for emergent vegetation

Answer 1

lakes and ponds

Question 2

larger than ponds, but there is no
strict defined boundary.

Answer 2

lakes

Question 3

near the shore and contains
shallow, sunlit waters.

Answer 3

littoral zone

Question 4

plants that are rooted to the
bottom and emerge above the water’s surface

Answer 4

emergent vegetation

Question 5

photic open water area where rooted plants cannot survive

Answer 5

limnetic zone

Question 6

are the only photosynthetic
organisms.

Answer 6

phytoplankton

Question 7

This zone extends only as deep as
sunlight lican penetrate.

Answer 7

limnetic zone

Question 8

directly below the limnetic zone

Answer 8

profundal zone

Question 9

is the bottom of the lake or pond

Answer 9

benthic zone

Question 10

Food webs are based around
_____ (dead matter and waste) that falls down from above.

Answer 10

detritus

Question 11

Oxygen levels are low, limiting the size of any nekton.

Answer 11

benthic zone

Question 12

Ecologists will classify lakes based on their ______ and _______

Answer 12

nutrient levels ; biological productivity.

Question 13

who will classify lakes based on its nutrient levels and biological productivity?

Answer 13

ecologists

Question 14

lakes are very low in nutrients, limiting plankton populations and leaving the water very clear

Answer 14

oligotrophic

Question 15

lakes have much greater concentrations of nutrients, resulting in heavy growth of phytoplankton.

Answer 15

eutrophic

Question 16

narrow channels that carry
small amounts of water

Answer 16

streams

Question 17

wider (than streams) and carry more water

Answer 17

rivers

Question 18

Form when streams combine
with runoff water from the surrounding land.

Answer 18

rivers

Question 19

divided into zones, each with different characteristics

Answer 19

rivers

Question 20

the 3 river zones

Answer 20

source zone
transition zone
floodplain zone

Question 21

original point from which a river
flows – a spring, lake, glacier, or wetland

Answer 21

source

Question 22

river zone characteristics

Answer 22

high oxygen content
low nutrient levels
cold water temperature
low turbidity

Question 23

As the water moves through the _______, the river widens, become deeper, and are warmed by the sun

Answer 23

transition zone

Question 24

Low-lying areas, called the _____, will occasionally flood and deposit material from upstream

Answer 24

floodplains

Question 25

river eventually ends at a larger body of water. This is called

Answer 25

river mouth

Question 26

Freshwater mixes with saltwater, forming _____

Answer 26

brackish water

Question 27

areas of land regularly saturated with water

Answer 27

wetlands

Question 28

areas of low-lying wetland that
do not support the growth of trees

Answer 28

marshes

Question 29

forested wetlands.

Answer 29

swamps

Question 30

emergent vegetation is found in what zone?

Answer 30

littoral zone

Question 31

it is aphotic

Answer 31

profundal zone

Question 32

_______ are based around detritus (dead matter and waste) that falls down from above.

Answer 32

food web

Question 33

what happened to the oxygen level, nutrient level and temperature in transition zone?

Answer 33

oxygen level decreases, nutrient level rise, temperature increases

Question 34

oxygen, nutrient, and water temperature condition in flood plain

Answer 34

oxygen content is low, nutrient rich, water is warm

Question 35

characteristics of wetlands

Answer 35

hydric soils that are completely saturated with water, and low oxygen content

hydropyhtes, plants that only grow in water

high amount of water flowing in from surrounding areas