Food chains, pyramids and ecological relationships

All food webs and food chains begin with _________________.

• primary consumer
• producers
• secondary consumers
• predators

How many carnivores are shown in this food web?

• 6

• 4

• 5

• 3

What percentage of energy is passed on to each tropic level?

• 10%
• 50%
• 90%
• 100%

Only about ten percent of the energy stored in an organism can be passed on to the next trophic level. Of the remaining energy, some is used for the organism’s life processes, and the rest is typically...

• used in reproduction

• stored as body fat

• stored as body tissues

• converted to heat and lost

Which organism do the owl and the weasel compete for in the food web?

• Hawk
• Spider
• Grasshopper
• Shrew

Which organism recieves the least amount of energy from the producer?

• Owl
• Grasshopper
• Lilypad
• Mouse

Which level will contain plants?

• A
• B
• C
• D

In a food web, arrows point at:

• who gets energy.
• who gets eaten.

All energy on Earth ultimately comes from what source?

• Water
• Sun
• Consumers
• Oxygen

An organism that eats the secondary consumer.

• Primary Consumer
• Secondary Consumer
• Tertiary Consumer
• Consumer