Many species of bacteria live inside and on the human body. What determines the types of symbiotic relationships that bacteria form with humans?

If they are helping, harming, or not impacting the human

How many individuals are in the population

If there are many species of bacteria to compete with

If the human can take an antibiotic to kill the bacteria

Many tree frog populations are threatened due to habitat loss. To promote conservation, tree frogs may be bred in captivity. A zoo acquired male and female tree frogs from two different populations. In the zoo, the tree frogs were able to successfully mate within their population, but breeding attempts between the two populations were unsuccessful. Based on this information, which statement correctly describes the relationship between the two populations of tree frogs?

They are in the same genus but of different species.

They are in the same species but in different kingdoms.

They are in the same class but different phyla.

They are in the same family but in different orders.

What is the most likely effect of a prolonged drought on a population of deer in a forest ecosystem?

The deer population will decrease due to limited water and food availability.

The deer population will increase due to less competition for water.

The deer population will remain the same because they can survive without water.

The deer population will increase because drought increases plant growth.

Which of the following is an example of a living factor affecting the distribution of a population?

An increase in predators reduces the prey population

A decrease in sunlight reduces plant growth

A natural disaster destroying habitat

A change in temperature makes the environment too cold

How would a significant decrease in soil nutrients most likely affect plant and animal populations in an ecosystem?

Plant growth would decrease, leading to a decline in herbivores and predator populations.

Plant growth would increase, providing more food for herbivores.

Animal populations would not be affected because they do not rely on soil nutrients.

The ecosystem would remain unchanged because plants can survive without nutrients.

What would most likely happen if a keystone species, such as a top predator, were removed from an ecosystem?

The prey population would increase uncontrollably, disrupting the balance of the ecosystem.

The prey population would decrease because they rely on predators for survival.

The ecosystem would remain unchanged because predators have no major effect.

The predator’s removal would cause all species to go extinct.

A river runs through a forest ecosystem, supporting a variety of plant and animal species. Over the years, human activities such as deforestation and pollution have increased in the area. The removal of trees has led to soil erosion, causing more sediment to enter the river. At the same time, runoff from nearby farms has introduced excess fertilizers into the water. These changes have led to algal blooms, reducing oxygen levels in the river and causing a decline in fish populations. As fish populations decrease, predators like otters struggle to find food, leading to a decrease in their numbers as well.

Conducting surveys of fish populations before and after deforestation.

Guessing how many fish might have died based on observations.

Observing only one fish species without considering other factors.

Studying only the trees in the forest without analyzing water quality.

A river runs through a forest ecosystem, supporting a variety of plant and animal species. Over the years, human activities such as deforestation and pollution have increased in the area. The removal of trees has led to soil erosion, causing more sediment to enter the river. At the same time, runoff from nearby farms has introduced excess fertilizers into the water. These changes have led to algal blooms, reducing oxygen levels in the river and causing a decline in fish populations. As fish populations decrease, predators like otters struggle to find food, leading to a decrease in their numbers as well.

The runoff and erosion led to a decline in fish, reducing the otters’ food source.

The pollution made the otters sick directly.

The excess fertilizer caused more fish to thrive, forcing otters to leave the area.

The removal of trees caused otters to stop hunting for food.

What additional scientific investigation could be conducted to better understand the long-term impact of pollution in the river ecosystem?

Measuring oxygen levels in the river over time

Counting the number of trees in the forest each year

Observing only one species and ignoring other organisms

Comparing the river’s pollution levels to those of a desert ecosystem

An ecological niche is –

The role a species has in an ecosystem

All the populations in an ecosystem

Which of the following justifies why no two species can occupy the same niche in the same habitat at the same time?

Because of the competitive exclusion principle

Because of the interactions that shape the ecosystem

Unless the species requires different abiotic factors

Unless the requires different biotic factors

What is biodiversity and why is it important for ecosystem stability? (Choose 2)

Biodiversity is the variety of life in a particular habitat or ecosystem and helps maintain ecosystem stability

Biodiverse ecosystems are more resilient to disturbances and can recover more quickly

Biodiversity refers to the number of predators in an ecosystem, which helps control prey populations

Biodiversity is the process of ecosystems changing due to climate change

Which of the following is an example of a density-independent limiting factor that could impact an entire ecosystem?

A drought that reduces water availability for all organisms.

Increased competition for food between predator species.

The spread of disease among a population of rabbits.

A higher birth rate in a population of wolves.

A scientist is studying a population of frogs in a wetland ecosystem. Which of the following observations represents quantitative data rather than qualitative data?

There are 45 frogs in the study area.

The frogs have smooth, green skin.

The frogs make loud croaking sounds at night.

The frogs appear to be very active after rainfall.

Unit 9 Test Review

Authored by Emani Braxton

Science

7th Grade

NGSS covered

Used 10+ times

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30 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which external stimuli cause plants to bend and grow toward it?

A light source

A magnetic field

A source of water

A source of minerals

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following refers to a 24-hour cycle in the physiological process of living things, including plants, animals, fungi, and cyanobacteria, and aids to life processes?

Diurnal rhythms

Circadian rhythms

Ultraviolet rays

Photosynthesis

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

All living things, or once living, things that directly or indirectly affect an organism or its environment are considered which of the following?

Abiotic factors

Biotic factors

Extraterrestrial factors

Non-Existential factors

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Biotic and abiotic factors determine the types and number of organisms of a species in an ecosystem are called which of the following?

Communities

Niches

Limiting factors

Inorganic resources

The interaction between consumers that hunt, capture, and consume another consumer is known as which of the following relationships? (choose 2)

Predation

Parasitism

Competition

Mutualism

MULTIPLE SELECT QUESTION

30 sec • 1 pt

When members of a population interact with each other for basic resources such as which of the following?

Mating

Territory

Maturation

Cooperating

Hibernation

Drag and drop the correct term that describes each of the symbiotic relationships below.

Remoras eat leftovers, shark not affecte

Commensalism

Acacia trees and ants help each other.

Parasitism

Heartworms harm dogs by feeding inside.

Mutualism

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Unit 9 Test Review

Which external stimuli cause plants to bend and grow toward it?

Which of the following refers to a 24-hour cycle in the physiological process of living things, including plants, animals, fungi, and cyanobacteria, and aids to life processes?

All living things, or once living, things that directly or indirectly affect an organism or its environment are considered which of the following?

Biotic and abiotic factors determine the types and number of organisms of a species in an ecosystem are called which of the following?

The interaction between consumers that hunt, capture, and consume another consumer is known as which of the following relationships? (choose 2)

When members of a population interact with each other for basic resources such as which of the following?

Drag and drop the correct term that describes each of the symbiotic relationships below.

Match the symbiotic relationships to the correct smiley faces.

Many species of bacteria live inside and on the human body. What determines the types of symbiotic relationships that bacteria form with humans?

Classify the following terms as either Abiotic or Biotic.

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