Biodiversity in Ecosystems

The shrew provides energy for the _______?

• cricket
• grasshopper
• frog
• snake

Why don't most parasites kill their hosts immediately?

• The host benefits by keeping the parasites alive.
• The host is able to fight off the invading parasites.
• The parasites help the host before killing it.
• The parasites would no longer have a food supply if the host died.

In the energy pyramid below, which organism has the least amount of energy available?

• Producers
• Herbivores
• Carnivores
• Top Predator

Which of the following organisms in the food web is a producer?

• Giant Panda
• Snow Leopard
• Mushroom
• Bamboo

If the grasshopper were to be removed completely from the food web, what organism would be most effected?

• The squirrel
• The shrew
• The deer
• The rabbit

Use the diagram to answer the question.
The trout is a source of food for the human and the eagle. When there are more than one organism vying for the same source we call this____?

• Population
• Resources
• Community
• Competition

A relationship in which one organism benefits and the other is unaffected.

• mutualism
• parisitism
• symbiosis
• commensalism

What is the source of energy for all producers?

• sun
• wind
• Earth
• rain

Which of the following are examples of natural ecosystem change? Check all that apply.

• A beaver builds a dam and blocks a stream, forming a pond. Organisms that rely on fast moving water die out. Over time, populations of pond-loving species increase in the area.

• When a volcano erupts, the surrounding plants are destroyed and leave only bare lava. Pioneer species begin to grow on the lava. Over time, more and more different species reclaim this area.

• A fire burns down a large area of forest. Only soil remains. The next season, small plants sprout. Over time, new trees reclaim this area.

• A herd of grazing buffalo tramples on tree seedlings and digs up the ground, destroying the young trees. In the bare patches, new plants grow.

Select the true statement

• All species in an ecosystem are connected to one another.

• All species in an ecosystem are independent of one another.

• A change in a physical or biological characteristic of an ecosystem will affect all species in the same way.

• An ecosystem that is out of balance can never be returned to balance.