ecology unit test

Question 1

a carnivore that has no predators

Answer 1

top predator

Question 2

an animal which is hunted

Answer 2

prey

Question 3

a pictorial description of the transfer of energy in a food chain in called

Answer 3

an energy pyramid

Question 4

two events which add new individuals to a population are

Answer 4

natality and immigration

Question 5

the size of a population decreases as a result of

Answer 5

mortality and emigration

Question 6

the number of organism occupying a habitat is referred to as

Answer 6

the population density

Question 7

this biome is a vast treeless plain

Answer 7

grassland

Question 8

this time is the characteristic of succulent plants because it is hot and dry

Answer 8

desert

Question 9

this biome has a high rain fall and the greatest diversity of life

Answer 9

tropical rain forest

Question 10

this biome contain trees that loses there leave in the winter

Answer 10

temperate forest

Question 11

this biome has a layer of frozen soil

Answer 11

tundra

Question 12

the last organism in most food chains

Answer 12

top predator

Question 13

the soil portion of the earth.

Answer 13

lithosphere

Question 14

the layer of water supporting life on earth

Answer 14

hydrosphere

Question 15

food energy levels

Answer 15

trophic levels

Question 16

true or false: nutrients cycling is a common process in most ecosystems

Answer 16

True

Question 17

true or false: the size of a population is dependant on the abiotic factors of an ecosystem

Answer 17

false

Question 18

true or false: aquatic ecosystems have the same amount of biotic and abiotic factors

Answer 18

true

Question 19

what is an example of a density dependant factor

Answer 19

an infectious disease

Question 20

scavengers: importance, what would happen is disappeared

Answer 20

• keeps ecosystems free of dead bodys
• dead organism would accumulate

Question 21

decomposer: important, what would happen if they disappeared

Answer 21

• break down organic materiel and return nutrients to the soil for producers
• nutrients in soil would decrease and producers would die off

Question 22

producer: importance, what would happen if they disappeared

Answer 22

• convert light energy in to chemical energy and 02
• all life would disappear

Question 23

top carnivores: what would happen if they disappeared

Answer 23

• they regulate ecosystems
• herbivore would increase and producer population would decrease

Question 24

in the carbon cycle what are the 2 chemical reactions

Answer 24

cellulaire respiration and photosynthesis

Question 25

what is the formula for photosynthesis

Answer 25

6co2 + 6h20 = c6h1206 + 602

Question 26

what feed level is the most important energy supply in most food webs

Answer 26

1st, primary consumer

Question 27

why is the term food web more accurate then food chain

Answer 27

because animals eat more then one thing, gives a better representation of an ecosystem

Question 28

why is an ecosystem with more biodiversity more stable

Answer 28

because you could remove one or two spec and ecosystem wouldn’t be harmed.

Question 29

list 4 factors that determine population size

Answer 29

a) natality b) immigration
c) mortality d) emigration

Question 30

list 5 factors that effect populations

Answer 30

a) fragmentation b) clear cutting
c) acid rain d) climate change
e) pollution

Question 31

what are the five biomes

Answer 31

1. temperate forest
2. boreal forest
3. desert
4. grassland
5. tropical rain forest

Question 32

how do you find the population density

Answer 32

animal/km2

Question 33

how do you find birth rate

Answer 33

init. pop.

Question 34

besides death what are the effects DDT had on birds

Answer 34

• thin egg shells
• malformed bodies (born with beak backwards)

Question 35

effects of acid rain

Answer 35

kills trees
- acidifie water and soil
- kills fish that lives in water

Question 36

rabbits didn’t exist in Australia until euro brought them over why is this a problem

Answer 36

• no predators
• excess food source