Ecological Relationships and Systems

An example of a biotic factor in an ecosystem is

• temperature

• drinking water

• fungi

• oxygen

Which of these is an example of a freshwater biome?

• tundra

• deciduous forest

• ocean

• marsh

A pearlfish spends the day inside the intestines of a sea cucumber. The fish leaves the protection of the sea cucumber at night to feed on small crustaceans. The sea cucumber is not helped or harmed by this. 

• Mutualism

• Commensalism

• Parasitism

• Predation

A cymothoid isopod lives inside the mouth of a snapper fish. The isopod cuts blood vessels in the fish’s tongue, causing the tongue to get destroyed. The isopod then hooks it's pereopods, or legs, to the base of the fish’s tongue, essentially replacing the tongue. The isopod stays there for the rest of its life, feeding on blood, mucus, and stray pieces of food from the fish.   

• Mutualism
• Commensalism
• Parasitism
• Predation

A boxer crab carries a pair of small anemones in its claws. When approached by a predator, the crab waves the stinging tentacles of the anemones to deter the predator. The anemones eat the small particles of food dropped by the crab when it is feeding.

• Mutualism
• Commensalism
• Parasitism
• Predation

A limited supply of food and shelter in the same habitat will lead to -

• mutualism
• parasitism
• competition
• environmental changes

All energy on Earth ultimately comes from what source?

• Water
• Sun
• Consumers
• Oxygen

Click on the image to make it larger-- Choose the living things that are producers...

• wildflowers

• rabbit

• snake

• grass

Which biome has deciduous trees (which lose their leaves)?

• Temperate Forest
• Rainforest
• Grasslands
• Taiga

Which biome has the most variety of plants and animals?

• Temperate Forest
• Rainforest
• Tundra
• Grasslands