Aquatic & Terrestrial Pollution
In assessing how an endocrine disruptor may affect calcium metabolism in a marine food web, what organism combination would provide comprehensive insight into bioaccumulation up the trophic levels?
Plankton, shellfish, small fish species that feed on plankton/shellfish, seabirds that prey upon small fish.
Saltwater crocodiles as apex predators without considering lower-level effects.
A single species analysis focusing solely on large predatory sharks' tissue samples.
Coral reefs exclusively since they are foundational but do not reflect bioaccumulation up tropic levels adequately by themselves.
Which factor complicates regulation efforts aimed at reducing releases of endocrine-disrupting chemicals into the environment?
Effects like cost-benefit analyses tend toward underestimating their broad environmental impacts.
The widespread use across multiple industries makes pinpoint source identification challenging.
Information is typically easy given their limited commercial applications.
Expensive toxicological testing and research is yet to be conducted on all known endocrine disruptors.
Which of the following endocrine disruptors can be found in plants with hormone-like activities?
Dioxins
Phytoestrogens
PCB
Triclosan
In an aquatic ecosystem, what is the most plausible consequence of bioaccumulation of endocrine disruptors on trophic cascades?
Altered fish reproduction could lead to decreased predator populations higher up the food chain.
Improved water quality as endocrine disruptors stimulate microbial degradation processes.
No change in trophic cascade dynamics since only top predators are affected by such chemicals.
Increased plant growth due to less herbivory by compromised fish species at lower trophic levels.
How do endocrine disruptors typically enter waterways?
Atmospheric deposition
Thermal expansion of water
Industrial discharge
Natural spring overflow
What long-term effect might occur if a country implements strict regulations against manufacturing industrial chemicals known as potent endocrine disruptors?
Enhanced human health outcomes due to diminished exposure levels over subsequent generations.
Significant drop-in employment rates within chemical industries due to abrupt regulatory changes leading immediately to factory closures.
Increase inflow of foreign investment into renewable energy sectors given stricter chemical regulations deterring potential investors.
Correction of ozone layer depletion since banned substances also include ozone-depleting agents aside from being endocrine disruptors.
Which substance is commonly recognized as an endocrine disruptor?
Bisphenol A (BPA)
Sodium chloride (table salt)
Calcium carbonate (limestone)
Glucose (sugar)

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Where are endocrine disruptors commonly found?
Medicinal drugs
Natural water sources
Industrial waste sites
Plastic items, foods, and pesticides
What is a potential effect of long-term exposure to endocrine disruptors on tertiary consumers in a terrestrial ecosystem?
Prey species become more abundant due to increased mutation rates.
Tertiary consumers evolve rapidly to become resistant to pollutants.
Immediate cessation of energy transfer from lower trophic levels occurs.
Bioaccumulation may lead to disruptions in growth patterns and behaviors.
How might the presence of endocrine disruptors influence natural selection within a terrestrial ecosystem?
Plant species will evolve more rapidly due to increased mutation rates from chemicals.
Predators will shift their diet preferences towards unaffected prey species exclusively.
Organisms less sensitive to endocrine disruption may have increased survival and reproduction rates.
Decomposers will become dominant, as they are immune to chemical pollutants entirely.