Virtual Ecology Day 1

Which of the following answer choices represents ONLY abiotic factors?

• Dirt, air, water

• Ice, insects, trees

• Air, water, ants

• Air, water, ants

Based on the following food web, which could be a secondary consumer (Carnivore)?

• grass

• rabbit

• snake

• deer

What is a biotic factor that would reduce biodiversity?

• Rain with a pH of 1

• Rain with a pH of 14

• Mountains eroding

• Deer hunting

Producers mainly rely on _____________ for food/energy.

• photosynthesis

• carnivores

• producers

• consumers

Analyze the food web below. A rare disease eliminates the entire owl population. What is the most supported conclusion statement.

• Foxes would lack food choices

• Mice and grasshoppers would go extinct

• Birds would die

• Grains and grass levels would decrease

A crab carries a pair of sea anemones on its claws. The crab uses the sea anemone’s stinging tentacles as protection and the sea anemone obtains small food particles released by the crab as it feeds. Which type of symbiotic relationship does this best illustrate?

• mutalism

• parasitism

• commensalism

• predation

Which correctly describes how planting more trees has an impact on the carbon cycle?

• Decreased levels of carbon are stored in trees when carbon is absorbed from the soil.

• Increased levels of carbon are stored in trees since photosynthesis uses gaseous carbon dioxide.

• Trees release harmfully high levels of carbon dioxide during cellular respiration and create more air pollution

• Trees reduce run-off into the oceans, causing an increase in the amount of carbon dioxide in the oceans and therefore more pollution.

If a population of nitrogen–fixing bacteria in an ecosystem was severely decreased, which is the most likely result?

• Plants and animals would be unable to produce proteins.

• Plants would be unable to perform photosynthesis.

• Plants and animals would be unable to perform cellular respiration.

• Plant and animal cells would no longer be able to make phospholipids for the cell membrane.

Why is there less energy at the top of the pyramid then at the bottom?

• only 90% of the usable energy is passed to the next trophic level

• 20% of the energy is given off as heat

• there are more producers than consumers in the pyramid of energy

• only 10% of the usable energy is passed to the next trophic level

In the nitrogen cycle, plants use nitrogen compounds to produce:

• glucose

• starch

• proteins

• lipids