BIO120H1 Lecture : lect 10.docx

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BIO120H1 Full Course Notes

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Divide organismin ecosystem based on where they are in relationship with food that fuels their lives. Fw emphasizes influence of population on growth rates in other populations. Magnitude of changes wher e1 trophic level has impact below it. Can be down by removal experiments and addition experiments. Insecticide killed beatle in treatment plot and allows for the plants to prosper. Why when we look at world do we sooo much green, unconsumed by herbivores. Answer is that there must a factor other than the supply of green tissue that controls the herbivores. Herbivores they concluded are typically held down by carnivores. So carnivores good to plants through indirect effect. Effects of one animal cascade onto other things. Far reaching effects of fish in ponds some ponds of fish, som don"t. In those with, they eat larvae of dragon fly. This influences size of adult larval dragon flies.

Related Questions

The vast majority of energy taken into an ecosystemis____________.
a. converted into biomass by plants.
b. utilized by secondary consumers.
c. lost as heat.
d. used by the primary consumers.
e. concentrated in the decomposers.

A farmer is using an insecticide to treat his crops. While mostinsects do not survive their first exposure to the insecticide somehave a gene that enables them to survive. When these survivorsreproduce they will likely pass along this resistance to theiroffspring. This results in an increase in numbers of the insectsover time. Which of the following processes applies to thissurvival?
a. cloning
b. mutation
c. natural selection
d. genetic engineering

What is the ecological relationship between insects andcrops?
a. mutualism
b. competition
c. predation

Sea anemones growing on the backs of crabs without damaging thecrabs are an example of
a. Parasitism
b. Commensalism
c. Mutualism

Which of these is a population density-independent regulatingfactor?
a. Competition
b. Predation
c. Size of population
d. Weather
e. Resource availability

Producers are_________.
a. Autotrophs
b. Herbivores
c. Omnivores
d. Carnivores

If biological magnification occurs, the ___ will have the highestlevels of toxins in their systems.
a. producers
b. herbivores
c. primary carnivores
d. top carnivores

Given the amount of sunlight that hits the plants on our planet,and the ability of plants for rapid growth and reproduction, howcome we arenât all hip deep in dead plants?

11. As energy flows through the food web in an ecosystem, the amount of energy that is transferred from one trophic level to the next trophic level increases. stays the same. decreases. may increase or decrease, depending upon the system.

12. Autotrophs are organisms that obtain energy by breaking down tissues of organisms that have died. harness external energy sources to produce complex chemical compounds. depend directly on primary producers for their energy and nutrients. eat other autotrophs to obtain energy.

13. Which of the following gives the correct order for energy flow through an ecosystem? primary producers â secondary producers â tertiary producers primary consumers â primary producers â secondary producers secondary consumers â primary consumers â primary producers primary producers â primary consumers â secondary consumers

14. Which one of the following aspects of plant biology is not directly involved in maintaining an adequate supply of water for the entire plant? phloem roots xylem transpiration pull

15. Which structure(s) do most plants use to acquire the energy that they need for cellular processes? the roots the leaves the stem

5-If a farmer sprays a pesticide onto a field and kills half ofthe insect pests, he has caused a reduction in________.
a. field capacity
b. carrying capacity
c. population size
d. More than one of the above

6-What type of survivorship curve would you expect for a plantspecies in which only a few seeds are produced and most of thesesurvive to produce adult plants?
a. type I
b. type II
c. type III

7-An ecological niche is an organism's_______ in anecosystem.
a. location
b. habitat
c. resources
d. function

8-No matter how rapidly populations grow, they eventually reacha limit and begin to stabilize. This is called the______________.

9-Unicellular algae live in the tissues of coral animals. Thealgae provide food for the coral, while the coral provides a stablehome for the algae. This is an example of
a. Parasitism
b. Commensalism
c. Mutualism

10-The vast majority of energy taken into an ecosystemis____________.
a. converted into biomass by plants.
b. utilized by secondary consumers.
c. lost as heat.
d. used by the primary consumers.
e. concentrated in the decomposers.

11-A farmer is using an insecticide to treat his crops. Whilemost insects do not survive their first exposure to the insecticidesome have a gene that enables them to survive. When these survivorsreproduce they will likely pass along this resistance to theiroffspring. This results in an increase in numbers of the insectsover time. Which of the following processes applies to thissurvival?
a. cloning
b. mutation
c. natural selection
d. genetic engineering

12-What is the ecological relationship between insects andcrops?
a. mutualism
b. competition
c. predation

13-Sea anemones growing on the backs of crabs without damagingthe crabs are an example of
a. Parasitism
b. Commensalism
c. Mutualism

14-Which of these is a population density-independent regulatingfactor?
a. Competition
b. Predation
c. Size of population
d. Weather
e. Resource availability

15-Producers are_________.
a. Autotrophs
b. Herbivores
c. Omnivores
d. Carnivores

16-If biological magnification occurs, the ___ will have thehighest levels of toxins in their systems.
a. producers
b. herbivores
c. primary carnivores
d. top carnivores

17Given the amount of sunlight that hits the plants on ourplanet, and the ability of plants for rapid growth andreproduction, how come we arenât all hip deep in dead plants?

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BIO120H1 Lecture : lect 10.docx

BIO120H1 Full Course Notes

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