Chapter 7 Fill in the Blank
Completion
Complete each statement.
1. Plankton form the ____________________ of the marine food web.
2. The least productive marine ecosystem is the ____________________.
3. In estuaries, fresh water and salt water mix, forming a(n) ____________________ trap.
4. A(n) ____________________ lake has a large amount of plant growth due to nutrients.
5. Excessive nutrient growth in an aquatic ecosystem can be accelerated by ____________________.
6. Barnacles are a type of ____________________, or bottom-dwelling, organisms.
7. Fish are a type of ____________________, or free-swimming, organisms.
8. Mosses use ____________________ to anchor themselves to rocks near churning river headwaters.
9. Long, thin ____________________ islands typically run parallel to a shore.
10. The amount of dissolved salts in water is known as ____________________.
11. The water in salt marshes is saltier than the water in ____________________ marshes.
12. Many rivers originate from ____________________ in mountains.
13. A river changes with the ____________________ and ____________________ through which it flows.
14. Upstream, a river is usually cold and flows ____________________ through a shallow riverbed.
15. Downstream, a river often widens and flows more ____________________.
16. Coral polyps secrete skeletons of _________________________ that slowly accumulate and form coral reefs.
17. Corals live only in shallow, ____________________ water where there is enough light for photosynthesis.
18. An estimated ____________________ percent of all coral reefs are threatened by human activities.
19. Because water ____________________ sunlight, photosynthesis is limited to the upper 100 meters of the
ocean.
20. An arctic ecosystem depends almost entirely on ____________________ for its available food.
21. Most ocean pollution can be traced to activities on ____________________.
22. Three groups of aquatic organisms include plankton, ____________________, and benthos.
23. Two types of plankton are microscopic plants called _________________________ and microscopic animals
called _________________________.
24. Most of the food in aquatic ecosystems is produced by _________________________.
25. Marshes are dominated by ____________________ plants while swamps contain mainly
____________________ plants.
Chapter 7 Fill in the Blank
Answer Section
COMPLETION
1. ANS: base
PTS: 1
2. ANS: open ocean
DIF: 2
REF: 2
OBJ: 1
PTS: 1
3. ANS:
nutrient
mineral
DIF: 2
REF: 2
OBJ: 1
PTS: 1
4. ANS: eutrophic
DIF: 2
REF: 2
OBJ: 1
PTS: 1
5. ANS: runoff
DIF: 2
REF: 1
OBJ: 3
PTS: 1
6. ANS: benthos
DIF: 2
REF: 1
OBJ: 4
PTS: 1
7. ANS: nekton
DIF: 2
REF: 2
OBJ: 1
PTS: 1
8. ANS: rhizoids
DIF: 2
REF: 1
OBJ: 3
PTS: 1
9. ANS: barrier
DIF: 2
REF: 1
OBJ: 3
PTS: 1
10. ANS: salinity
DIF: 2
REF: 1
OBJ: 3
PTS: 1
11. ANS: brackish
DIF: 2
REF: 1
OBJ: 3
PTS: 1
12. ANS: snow melt
DIF: 2
REF: 2
OBJ: 2
PTS: 1
DIF: 2
13. ANS: land, climate
REF: 1
OBJ: 4
PTS: 1
14. ANS: swiftly
REF: 1
OBJ: 4
DIF: 2
PTS: 1
15. ANS: slowly
DIF: 2
REF: 1
OBJ: 4
PTS: 1
16. ANS:
limestone
calcium carbonate
DIF: 2
REF: 1
OBJ: 4
PTS: 1
17. ANS: warm
DIF: 2
REF: 2
OBJ: 3
PTS: 1
18. ANS: 27
DIF: 2
REF: 2
OBJ: 3
PTS: 1
19. ANS: absorbs
DIF: 2
REF: 2
OBJ: 3
PTS: 1
20. ANS: the ocean
DIF: 2
REF: 1
OBJ: 3
PTS: 1
21. ANS: land
DIF: 2
REF: 2
OBJ: 4
PTS: 1
22. ANS: nekton
DIF: 2
REF: 2
OBJ: 4
PTS: 1
DIF: 2
23. ANS: phytoplankton, zooplankton
REF: 1
OBJ: 3
PTS: 1
DIF: 2
24. ANS: phytoplankton
REF: 1
OBJ: 3
PTS: 1
DIF: 2
25. ANS: nonwoody, woody
REF: 1
OBJ: 3
REF: 2
OBJ: 2
PTS: 1
DIF: 2