Name: Unit 4 Homework Please answer the questions below. Point values are

Name:
Unit 4 Homework
Please answer the questions below. Point values are listed in parentheses.
In a simple ecosystem, there are two primary producers: species A and species B. Species A is eaten by species C and species D. Species E eats species B. And Species F eats E and D.
Please draw this food web. (2)
Name a species in each trophic level: (1)
First trophic level
Second trophic level
Third trophic level
Name a secondary consumer in your food web. (1)
Which species will have the most problems from biomagnification? Why? (1)
If you were to measure the energy in all the individuals of species F and all the individuals of species A, which would have more energy? Explain, and make sure you include the definition of trophic efficiency as part of your explanation. (2)
What molecules are made by photosynthesis? (1)
What molecules are used up in cellular respiration? (1)
For photosynthesis, where does the organism get the energy it puts into sugars? (1)
For cellular respiration, where does the cell get the energy it puts into ATPs? (1)
Name two major reservoirs for carbon in ecosystems. (2)
Name two major ways the humans are increasing CO2 in the atmosphere. (1)
On the axes below, draw a curve showing a population growing exponentially (label it exponential). Also draw a curve showing a population growing logistically (label it logistic. (2)
Which of your curves (the exponential or the logistic) had a higher per capita growth rate (r)? Depending on your graph, it could be either one, but please make sure your answer matches your graph. (1)
Which population (the exponential or the logistic) is being controlled by density-dependent factors? (1)
For each species interaction, fill in the effect of species on each other. The first is done for you: (2)
Predation (+ / -)
Competition ( ___ / ___ )
Commensalism ( ___ / ___ )