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Ecosystem and Environmental Science Midterm Exam Study Guide and Practice Questions

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2026/2027 Written for academic year
Institution Ecosystem And Environmental Science
Course Ecosystem and Environmental Science
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This Ecosystem and Environmental Science Midterm Exam Study Guide covers essential topics such as ecosystem structure, food chains and food webs, energy flow, nutrient cycles, biodiversity, population interactions, and environmental sustainability. It supports students in reviewing ecological principles, understanding relationships between organisms and their environments, and practicing exam-related questions. Use this resource to reinforce key concepts, organize revision, and prepare for the Ecosystem and Environmental Science midterm examination.

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Page 1 of 102 Ecosystem and Environmental Science
Ecosystem
Midterm
and Environmental
Exam Study Guide
Science
andMidterm
PracticeExam
Questions.pdf
Study Guide and Practice Questions




Ecosystem and Environmental Science
Midterm Exam Study Guide and
Practice Questions




Page 1 of 102 Ecosystem and Environmental Science
Ecosystem
Midterm
and Environmental
Exam Study Guide
Science
andMidterm
PracticeExam
Questions.pdf
Study Guide and Practice Questions

,Page 2 of 102 Ecosystem & Environmental Science Study Guide for Midterm Exam.pdf
Ecosystem & Environmental Science Study Guide for Midterm Exam




Food Chain


A sequence of organisms with each one serving as a source of nutrients or energy for the
next level of organisms.


Trophic Level


The feeding positions of all organisms.
Ex: 1) Primary Producers: Plants & Algae (first trophic level)
2) Primary Consumers: Herbivores (second trophic level)
3) Secondary Consumers: Carnivores (third trophic level)
4) Tertiary Consumers: Carnivores & Omnivores (fourth trophic level)
5) Apex Predators: top of food chain (fifth trophic level)




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Ecosystem & Environmental Science Study Guide for Midterm Exam

,Page 3 of 102 Ecosystem & Environmental Science Study Guide for Midterm Exam.pdf
Ecosystem & Environmental Science Study Guide for Midterm Exam




At each trophic level, a lot of energy is lost in the form of heat or is used for maintenance. As
a result, only 10% of energy is transferred to the next trophic level. As such little amount of
energy is transferred, the trophic levels are limited to 3-5 only.


Why are there only a few steps in a food chain?




Page 3 of 102 Ecosystem & Environmental Science Study Guide for Midterm Exam.pdf
Ecosystem & Environmental Science Study Guide for Midterm Exam

, Page 4 of 102 Ecosystem & Environmental Science Study Guide for Midterm Exam.pdf
Ecosystem & Environmental Science Study Guide for Midterm Exam




Decomposers, because without these organisms none of the nutrients would be recycled
back into the ecosystem.


What is the most important trophic level in any community?


Humans would be getting more energy from the plants than they would from meat because
plants have the most energy prior to being consumed.


Why would it be more beneficial for humans to eat vegetables directly than eat meat?


Food Pyramid


A graphic representation of the structure of a food chain, depicted as a pyramid having a
broad base formed by end consumers. Between successive levels, total biomass decreases
as energy is lost from the system.




Page 4 of 102 Ecosystem & Environmental Science Study Guide for Midterm Exam.pdf
Ecosystem & Environmental Science Study Guide for Midterm Exam

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