AP Environmental Science Practice Quiz: Endocrine Disruptors

Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026

Test your understanding with short quizzes. This quiz has 13 questions to check your progress.

Question 1 of 13

What is the fundamental characteristic of an endocrine disruptor?

A)It is a chemical that interferes with the endocrine system.B)It is a physical barrier that harms aquatic life.C)It is a nutrient that causes algal blooms.D)It is a heavy metal that causes direct poisoning.

All Questions (13)

What is the fundamental characteristic of an endocrine disruptor?

A) It is a chemical that interferes with the endocrine system.

B) It is a physical barrier that harms aquatic life.

C) It is a nutrient that causes algal blooms.

D) It is a heavy metal that causes direct poisoning.

Correct Answer: A

The provided text explicitly defines endocrine disruptors as 'chemicals that can interfere with the endocrine system of animals.'

According to the text, which of the following is a potential effect of endocrine disruptors on animal populations?

A) Increased resistance to disease.

B) Enhanced growth rates.

C) Gender imbalances.

D) Improved camouflage abilities.

Correct Answer: C

The content clearly states that endocrine disruptors can lead to 'gender imbalances in fish and other species.'

A population of fish exposed to a certain chemical shows an increase in developmental disorders. This chemical is likely acting as a(n)...

A) Carcinogen

B) Endocrine disruptor

C) Mutagen

D) Teratogen

Correct Answer: B

The text directly links endocrine disruptors to 'developmental disorders' in fish and other species.

Which of the following best describes the scope of organisms affected by endocrine disruptors as mentioned in the text?

A) Only fish

B) Only mammals

C) Only amphibians

D) Fish and other animal species

Correct Answer: D

The text specifies that these chemicals affect the endocrine systems of 'animals' and gives examples including 'fish and other species.'

The effects of endocrine disruptors, such as birth defects and gender imbalances, would most directly impact which ecosystem-level characteristic?

A) The rate of primary productivity.

B) The population's reproductive success and viability.

C) The soil pH and nutrient levels.

D) The frequency of volcanic activity.

Correct Answer: B

Birth defects, developmental disorders, and gender imbalances all interfere with the ability of a population to reproduce successfully, which threatens its long-term viability within the ecosystem.

Which of the following is a specific consequence of endocrine disruptor exposure mentioned in the provided information?

A) Increased water temperature

B) Birth defects

C) Acid rain formation

D) Ozone layer depletion

Correct Answer: B

The content explicitly lists 'birth defects, developmental disorders, and gender imbalances' as effects of endocrine disruptors.

How do endocrine disruptors primarily cause harm to ecosystems?

A) By directly poisoning all organisms upon contact.

B) By altering the physical landscape of habitats.

C) By interfering with the hormonal systems of animals, affecting reproduction and development.

D) By increasing the amount of sediment in waterways.

Correct Answer: C

The core mechanism described is interference with the endocrine (hormonal) system, which leads to organism-level problems like birth defects and gender imbalances, thereby harming the ecosystem's populations.

Endocrine disruptors are a type of...

A) Biological organism

B) Physical pollutant

C) Chemical pollutant

D) Radiological element

Correct Answer: C

The text begins by stating, 'Endocrine disruptors are chemicals that can interfere with the endocrine system...'

Based on the provided text, the introduction of a potent endocrine disruptor into an aquatic environment is most likely to lead to which long-term outcome for a fish species?

A) A rapid increase in population size due to fewer predators.

B) A gradual decline in the population due to reproductive failure.

C) A shift in the species' primary food source.

D) An immediate adaptation to the chemical with no negative effects.

Correct Answer: B

The described effects—birth defects, developmental disorders, and gender imbalances—all severely hinder successful reproduction. Over time, this reproductive failure would lead to a population decline.

The term 'gender imbalances' as an effect of endocrine disruptors refers to...

A) Changes in the physical environment that favor one gender.

B) Disruptions in the normal ratio of males to females or the development of sexual characteristics.

C) Competition for resources between males and females.

D) A social hierarchy change within an animal population.

Correct Answer: B

Within the context of endocrine (hormone) systems, a gender imbalance would relate to the hormonal controls over sexual development and the resulting ratio of males and females in a population.

The threat of endocrine disruptors to an ecosystem's stability stems from their ability to undermine which fundamental biological process?

A) Photosynthesis

B) Cellular respiration

C) Reproduction and development

D) Decomposition

Correct Answer: C

All the listed effects (birth defects, developmental disorders, gender imbalances) are directly related to failures in the processes of reproduction and proper development of offspring, which is critical for a population's survival.

Which of the following is NOT an effect of endocrine disruptors explicitly stated in the provided content?

A) Birth defects in fish

B) Developmental disorders in animals

C) Bioaccumulation in fatty tissues

D) Gender imbalances in species

Correct Answer: C

While many pollutants do bioaccumulate, the provided text only mentions birth defects, developmental disorders, and gender imbalances as effects of endocrine disruptors.

A chemical spill occurs in a river, and several years later, scientists note that the local fish population has a skewed sex ratio and many young fish exhibit stunted growth. This evidence strongly suggests the river has been contaminated with...

A) Excess nitrates and phosphates

B) An endocrine disruptor

C) Acidic compounds

D) Suspended solids

Correct Answer: B

The observed effects—skewed sex ratio (gender imbalance) and stunted growth (a developmental disorder)—are hallmark consequences of endocrine disruptors as described in the text.