UNIT CHALLENGE LOG

Eco Balance Study Guide

Ecosystem dynamics, energy flow, and material cycling verification charts.

STUDENT:

DATE:

Reference Ledger (Master Vocabulary Bank)

(Apply metrics directly to the chalk lines below)

1%

50

90%

acid

algae

bacteria

biodiversity

carbon

carrying

chemical

climax

combustion

commensalism

decline

decomposers

decrease

density

depletion

diversity

non-native

exponential

fragmentation

glucose

greenhouse

increase

independent

invasive

logistic

magnification

migratory

mutualism

native

nitrogen

parasitism

pioneer

predator

producer

producers

recycled

respiration

runoff

secondary

sediments

succession

sunlight

temperature

tertiary

transpiration

urban

water

FOLD BACK CHALKBOARD

BOARD I: ENERGY PYRAMIDS & TROPHIC CYCLES (1 - 8) KEY ANSWERS

01

The ultimate source of energy for almost all biospheric processes is sunlight, which primary producers capture and convert into stored chemical potential energy.

sunlight

producers

chemical

02

Because roughly 90% of energy is lost as heat at each transfer, the absolute smallest tier of available energy is found at the tertiary consumer level.

90%

tertiary

03

In an energy pyramid, if a plant has 5000 calories, a caterpillar receives 500, and a robin receives approximately 50 calories—which represents only 1% of the original producer energy.

50

1%

04

Unlike energy which flows one-way, nutrient molecules are endlessly recycled by specialized decomposers that break down organic waste.

recycled

decomposers

05

While energy decreases at higher trophic levels, the concentration of persistent harmful toxins increases in a process called biological magnification.

magnification

06

Marine food webs rely heavily on microscopic algae acting as the primary producer to capture solar energy and support higher consumer tiers.

algae

producer

07

Cutting down expansive regions of forest reduces photosynthetic capacity globally, leading to a long-term increase of atmospheric carbon dioxide.

increase

08

The gradual rise in Earth's average temperature since 1960 is primarily explained by heat trapped via a stronger greenhouse effect.

temperature

greenhouse

Chalk Series: Ecosystem Dynamics Page 1 of 4

Eco Balance Study Guide

Population thresholds, succession paths, and growth curves.

BOARD II: POPULATION INTERACTION & LIMITS

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BOARD II: POPULATION GROWTH & LIMITS (9 - 16) KEY ANSWERS

09

With unlimited resources, a population grows rapidly via J-shaped exponential models, but resource limits eventually force S-shaped logistic growth.

exponential

logistic

10

The leveled-off top section of a logistic growth curve represents the ecosystem's carrying capacity, which can decrease if critical resources are permanently depleted.

carrying

decrease

11

Limiting factors that alter growth rates more intensely as population sizes rise are density-dependent, whereas sudden freezes act as density-independent factors.

density

independent

12

Directly following a dramatic spike in the specialist predator population, the prey population usually experiences a steep decline.

predator

decline

13

In symbiosis, mutualism benefits both organisms, commensalism leaves one unaffected, and parasitism exploits a host while harming it.

mutualism

commensalism

parasitism

14

Seasonal, long-distance movement (such as bird migration) is a key migratory behavior that allows populations to escape harsh winter climates.

migratory

15

Ecological succession on barren volcanic rock begins with hardy pioneer species, eventually establishing a stable climax community.

succession

pioneer

climax

16

Following a severe forest fire, recolonization of the biological community occurs on pre-existing soil via secondary ecological succession.

secondary

Chalk Series: Ecosystem Dynamics Page 2 of 4

Eco Balance Study Guide

Biogeochemical elements cycling, water flows, and conservation action.

BOARD III: CYCLE CYTOLOGY & IMPACTS

FOLD BACK CHALKBOARD

BOARD III: DYNAMICS & BIOGEOCHEMICAL CYCLES (17 - 26) KEY ANSWERS

17

In the carbon cycle, primary producers capture CO₂ to synthesize glucose, which organisms later break down to release energy via cellular respiration.

carbon

glucose

respiration

18

Living organisms require nitrogen for proteins and nucleic acids, which is fixed from inert atmospheric gas by specialized soil bacteria.

nitrogen

bacteria

19

Unlike other cycles, phosphorus has no gaseous atmospheric phase; when it is not actively cycling, it is sequestered inside ocean sediments.

sediments

20

Ecosystems depend heavily on the water cycle, which includes simple evaporation and direct water vapor release from plant stomata via transpiration.

water

transpiration

21

Splitting continuous wild habitats into tiny, isolated segments through road construction is a core threat known as habitat fragmentation.

fragmentation

22

Exotic invasive species can severely threaten local biodiversity because they often crowd out and outcompete vulnerable native species.

invasive

biodiversity

native

23

A primary goal of biological conservation is to preserve genetic and ecological diversity and avoid introducing damaging non-native species.

diversity

non-native

24

Excess synthetic agricultural fertilizers enter local rivers and lakes via surface water runoff, which triggers massive, oxygen-depleting blooms of algae.

runoff

25

The chemical combustion of fossil fuels releases corrosive sulfur compounds to produce acid rain, which speeds up forest and lake habitat degradation.

combustion

acid

26

Human production of CFCs led to stratospheric ozone layer depletion, whereas modern developers combat land degradation by focusing housing density on pre-existing urban plots.

depletion

urban

Chalk Series: Ecosystem Dynamics Page 3 of 4

Eco Balance Study Guide

Concept Mastery: Real-World Scenarios and True/False Affirmations.

BOARD IV: SCENARIO MASTERY VERIFICATION

FOLD BACK CHALKBOARD

BOARD IV: SCENARIO VERIFICATION CHECK (27 - 41) KEY ANSWERS

27

True/False: Trophic energy transfers are highly efficient, with 90% of chemical energy successfully passed to the next highest trophic level.

FALSE 90% is lost

28

True/False: Decomposers play a critical role in biospheric balance by endlessly recycling basic organic nutrients back to the environment.

TRUE

29

True/False: The ultimate driving force behind biogeochemical elements cycling through the carbon and nitrogen cycles is sunlight.

TRUE

30

True/False: Persistent harmful chemicals decrease in concentration at higher trophic levels in a process called biological magnification.

FALSE increases

31

True/False: Logistic growth curves represent wild populations growing with completely unlimited food, absence of disease, and zero predators.

FALSE exponential

32

True/False: A sudden, severe physical catastrophe like a drought represents a density-independent limiting factor on an ecosystem's carrying capacity.

TRUE

33

True/False: In commensalism, one participating organism benefits from the system while the other host is severely harmed or damaged.

FALSE parasitism

34

True/False: Hardy lichens that first colonize entirely bare, barren volcanic rock are designated by ecologists as pioneer species.

TRUE

35

True/False: A climax community represents the initial, highly unstable biological stage reached immediately after primary succession starts.

FALSE climax community

36

True/False: Under ideal conditions without resource constraints, a wild population grows along a J-shaped exponential growth model.

TRUE

37

True/False: During cellular respiration, organisms pull atmospheric carbon dioxide out of the air and convert it into high-energy organic glucose.

FALSE photosynthesis

38

True/False: In the nitrogen cycle, specialized soil bacteria are responsible for fixing inert atmospheric nitrogen gas into usable ammonium ions.

TRUE

39

True/False: Eutrophication is triggered when synthetic plant fertilizer runoff enters local waterways, leading to catastrophic algae overgrowth.

TRUE

40

True/False: Damaging exotic invasive species represent a major threat to global biodiversity conservation because they crowd out native species.

TRUE

41

True/False: Habitat fragmentation refers to splitting continuous wild ecosystems into tiny, isolated segments via road and building construction.

TRUE

Scenario Key Self-Quizzing: Fold back the right-hand column to hide the Field Key. For statements identified as False, write the correct specimen term in the margins to reinforce correct environmental definitions!

Chalk Series: Ecosystem Dynamics Page 4 of 4

Eco Balance Study Guide

Eco Balance Study Guide

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