1. Why are invasive species dangerous to the environment?

Question

They pollute the environment.
They are always predators.
They threaten biodiversity.
They bring abiotic factors.

2. Some flowering plants are pollinated by honeybees. At some time in the past, honeybees evolved the ability to see ultraviolet radiation. Some flowers have evolved to produce ultraviolet markers on their petals that direct honeybees to the reproductive parts of the flower. What is this an example of?
mutualism
commensalism
predation
coevolution

3. A relationship in which one species kills and consumes another species is known as
predation.
parasitism.
commensalism.
mutualism.

4. Legumes, a type of plant, require Rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen. Rhizobia use the legumes for food. What would most likely happen to the legume population if Rhizobia suddenly became extinct?
become extinct
learn to fix nitrogen
benefit in the long run
stay the same

5. Which term refers to a change in one species that results from a change in another species that it interacts with?
coevolution
commensalism
symbiosis
interaction

6. What is a snake that eats a mouse an example of?
predation
competition
mutualism
parasitism

7. Bears and salmon have a predator-prey relationship. What would most likely happen to the bear population if the salmon population increased?
stay the same
decrease
increase
become extinct

8. As human travel increases, the number of introduced species likely
decreases.
increases.
stays the same.
is eliminated.

9. A symbiotic relationship in which one species benefits and the other is harmed is known as
mutualism.
predation.
commensalism.
parasitism.

10. Which is most likely to help an introduced species become invasive?
a low reproductive rate
big difference between original and new habitats
a strong predator in new habitat
great tolerance to a wide range of conditions

Answer 1

Here are the answers to the questions based on ecological concepts:

1. They threaten biodiversity.
   Invasive species can outcompete native species for resources, leading to declines in native populations and overall biodiversity in ecosystems.

2. coevolution
   This scenario describes coevolution, where two species influence each other's evolution through their interactions.

3. predation.
   Predation is the relationship in which one species (the predator) kills and consumes another species (the prey).

4. become extinct.
   If Rhizobia were to become extinct, legumes would likely struggle to survive since they depend on these bacteria for nitrogen fixation, potentially leading to their extinction.

5. coevolution
   This term refers to the process where changes in one species prompt changes in another species with which it interacts.

6. predation
   A snake eating a mouse exemplifies predation, as one organism (the predator) consumes another (the prey).

7. increase
   If the salmon population increased, the bear population would likely increase as well due to an abundance of food.

8. increases.
   As human travel increases, the likelihood of introducing non-native species typically increases.

9. parasitism.
   This type of symbiotic relationship is where one species benefits at the expense of another, causing harm to the host.

10. great tolerance to a wide range of conditions
    This trait is likely to help an introduced species become invasive, as it allows the species to thrive in various habitats and conditions.

Answer 2

What are the main reasons forests are cut down? Check all that apply.

hunting
agriculture
logging
urban development
fishing

Answer 3

The main reasons forests are cut down include:

1. Agriculture - Forests are often cleared for farming and livestock grazing to meet the growing food demands.

2. Logging - Commercial logging for timber and paper products is a significant driver of deforestation.

3. Urban development - As populations grow, forests are cleared to make way for housing, infrastructure, and other urban needs.

While hunting and fishing may have some local effects on forest areas, they are not primary reasons for large-scale deforestation compared to the three mentioned above. Therefore, the relevant answers are agriculture, logging, and urban development.

Answer 4

Which statements describe biodiversity? Check all that apply.

It can describe any area from a small ecosystem to Earth as a whole.
It refers to the number and variety of organisms in an area.
It refers to only the number of organisms in an area.
It refers to only the variety of organisms in an area.
It contributes to the sustainability of an ecosystem.

Answer 5

The statements that describe biodiversity are:

1. It can describe any area from a small ecosystem to Earth as a whole.

   • Biodiversity can be assessed at various scales, from local ecosystems to global levels.

2. It refers to the number and variety of organisms in an area.

   • Biodiversity encompasses both the number of individual organisms (population size) and the variety of species present (species diversity).

3. It contributes to the sustainability of an ecosystem.

   • Higher biodiversity generally enhances ecosystem resilience and stability, making ecosystems more sustainable over time.

The following statements are not accurate descriptions of biodiversity:

3. It refers to only the number of organisms in an area.

   • This describes population size, not biodiversity, which includes both number and variety.

4. It refers to only the variety of organisms in an area.

   • This describes species diversity but does not encompass population size or overall biodiversity.

Thus, the correct answers are statements 1, 2, and 5.

Answer 6

Which factors are often associated with high biodiversity? Check all that apply.

large amount of wind
warm climate
large area
large prey
large niche diversity
cold climate

Answer 7

The factors often associated with high biodiversity include:

1. Warm climate - Warmer climates generally support a greater variety of plant and animal species due to more favorable growing conditions year-round.

2. Large area - Larger areas can support more habitats and ecological niches, leading to increased species diversity.

3. Large niche diversity - A greater variety of ecological niches allows for more species to coexist, promoting biodiversity.

The other factors:

• Large amount of wind and large prey do not directly correlate with high biodiversity.

• Cold climate, while it can have some biodiversity, typically supports fewer species overall compared to warmer climates due to harsher environmental conditions.

Thus, the correct answers are warm climate, large area, and large niche diversity.

Answer 8

its warm climate
large area
and
large niche diversity

Use the drop-down menus to complete the statements.

is the illegal capture or killing of wild animals.

results in the complete loss of an organism’s home.

can use up important resources that other organisms need.

is the release of harmful substances into the environment.

Answer 9

Here are the completed statements using the appropriate terms:

1. Poaching is the illegal capture or killing of wild animals.

2. Habitat destruction results in the complete loss of an organism’s home.

3. Overexploitation can use up important resources that other organisms need.

4. Pollution is the release of harmful substances into the environment.

These terms accurately fit the definitions provided in the statements.

Answer 10

Third one is Nonnative species

What are the ways in which captive breeding helps protect biodiversity? Check all that apply.

Captive breeding can increase population numbers.
Captive breeding can prevent deforestation.
Captive breeding can result in overpopulation.
Captive breeding can help remove species from the Endangered Species List.
Captive breeding can result in the eventual release of offspring into the wild.

Answer 11

The ways in which captive breeding helps protect biodiversity include:

1. Captive breeding can increase population numbers.

   • Captive breeding programs aim to boost the populations of endangered species, helping to recover species that are at risk of extinction.

2. Captive breeding can help remove species from the Endangered Species List.

   • Successful captive breeding programs can lead to the recovery of certain species, allowing them to be removed from the Endangered Species List once their populations are stable.

3. Captive breeding can result in the eventual release of offspring into the wild.

   • Captive breeding is often part of a larger conservation strategy that includes reintroduction of animals into their natural habitats to help restore wild populations.

The other statements are not correct:

2. Captive breeding can prevent deforestation.

   • Captive breeding does not directly prevent deforestation.

3. Captive breeding can result in overpopulation.

   • While captive breeding can lead to increased populations, it is not typically seen as a cause of overpopulation in the wild; rather, it aims to prevent extinction.

Thus, the correct answers are statements 1, 4, and 5.