Unit B - Ecosystems and Population Change

Question 1

littoral zone

Answer 1

shore to rooted plants, high biodiversity

Question 2

limnetic zone

Answer 2

open surface waters away from shore

Question 3

profundal

Answer 3

below penetration of light, limited life

Question 4

benthic

Answer 4

sediment surface, many decomposers

Question 5

oligotrophic

Answer 5

newer lakes, deep, cold, low nutrients, higher O2 levels

Question 6

eutrophic

Answer 6

older lakes filled with detritus, warm shallow, with lots of nutrients

Question 7

Levels of Classification

Answer 7

• Kingdom
• Phylum
• Class
• Order
• Family
• Genus
• Species

Question 8

prezygotic

Answer 8

before fertilization

Question 9

postzygotic

Answer 9

after fertilization

Question 10

punctuated euilibrium

Answer 10

quick changes (like a staircase)

Question 11

phyletic gradualism

Answer 11

gradual change (a gradual line)

Question 12

homologous structures

Answer 12

similar structure but different function

Question 13

analogous structures

Answer 13

similar function but different structure

Question 14

distruptive selection

Answer 14

favors either extreme

Question 15

stabalizing selection

Answer 15

favors the average

Question 16

directional selection

Answer 16

favors one extreme

Question 17

ecotone

Answer 17

transition between ecosystems with greater biodiversity than either ecosystem

Question 18

biotic potential

Answer 18

• number of offspring per birth
• breeding frequency
• length of reproductive life
• capacity for survival