5.3-Biodiversity - 1

What does biodiversity refer to?

• The number of animals in an area

• The variety of species in an area

• The number of plants in an area

How do changes in an ecosystem affect the species within that ecosystem?

• They do not affect the species

• They always increase the number of species

• They can have a positive or negative impact on species

• They only affect the biodiversity of plants

How does biodiversity change as more resources become available?

• It decreases

• It stays the same

• It increases

• It fluctuates randomly

What occurs to biodiversity as fewer resources become available?

• It decreases

• It increases

• It remains unaffected

• It fluctuates unpredictably

What do resources consumed from an ecosystem provide?

• Direct values

• Indirect values

• Environmental values

• Keystone species

Which of the following are examples of direct values from ecosystems?

• Shade trees, wetlands, hiking

• Crops, medicine, raw materials

• Mountains, rivers, lakes

What are resources in an ecosystem that are used but not consumed called?

• Direct values

• Indirect values

• Key-stone species

Which of the following are examples of indirect values from ecosystems?

• Crops, medicine, raw materials

• Shade trees, wetlands, hiking, touring

• Fish, timber, flowers

What is a keystone species?

• A species that dominates all others in an ecosystem

• A species that has no impact on other species

• A species that influences the survival of many other species in an ecosystem

• A species that exists only in specific climates

What is an example of a keystone species?

• African elephant

• Oak tree

• Goldfish

• Dandelion