3.3

Question 1

what is a producer in a food web

Answer 1

the producers are usually plants, they do not feed on any other species

Question 2

what is a primary consumer

Answer 2

primary consumers eat only from the producer level

Question 3

what is a secondary consumer

Answer 3

secondary consumers are species that eat from the primary level

Question 4

what is a tertiary consumer

Answer 4

tertiary consumers eat from the secondary level

Question 5

what is a quaternary consumer

Answer 5

a quaternary consumer eats species at the tertiary level

Question 6

at what level do you find herbivores?

Answer 6

primary

Question 7

at what levels do you find omnivores

Answer 7

primary + any one above primary

Question 8

at what levels do you find carnivores

Answer 8

any level greater than primary

Question 9

what is the difference between a food web and trophic cascade diagram

Answer 9

a food web shows which species eat which other species, while a trophic cascade shows relationships, positive or negative, direct or indirect, between different species

Question 10

how do you make predictions using a trophic cascade model?

Answer 10

a trophic cascade model can be used to see the indirect and direct relationships between species in a community, so one can predict that, for example, if species A has a negative effect on species B, that A’s removal from the ecosystem would cause B’s population to rise

Question 11

what is a keystone species

Answer 11

a keystone species is one that regulates an ecosystem, and one which its removal can cause the ecosystem to collapse