Chapter 2 Flashcards
The flea is involved in which type of symbiosis?
Parasitism
How much energy is lost after each trophic level?
About 90%
A group of whales is an example of what?
Population
Which of the following information could be used in the description of a grasshopper’s niche, but NOT in the description of its habitat?
The plant species it eats
Some birds are known as honey guides because they may be followed by humans to wild beehives. When the humans take honey from the hives, the birds are able to feast on the honey and bees, too. This type of relationship can best be deacribed as ____.
Mutualism
What is “soil type” to an earthworm?
An abiotic factor
Cougars are predators that often eat weakened or diseased animals. This is a description of the cougar’s ___.
niche
Organisms with overlapping niches probably have which type of relationship?
Competitive
What level on an energy pyramid has the smallest number of organisms?
The highest level
What is the ultimate source of energy?
The sun
How long are food chains?
It varies with the ecosystem
Which location would most likely hold autotrophs that derive their energy from chemical compounds?
In the swamp’s sediments
Which of the following nutrients has ONLY a short-term biogeochemical cycle?
Nitrogen
Which process beat describes nitrogen fixation?
Bacteria take nitrogen from the air and convert it to a form usable by plants
Your favorite plant is growing very slowly, and you would like to find some way to increase its growth rate. Which of the following should you try increasing first?
Nitrogen
Which biogeochemical cycle is LEAST dependent on the biotic process?
Water cycle
Some farmers use manure on their crop fields. How does this help the plants?
increases soul nitrogen and phosphorus levels
One of the nutrient cycles moves from an atmospheric gaseous form to the soil through both biotic and abiotic processes, moves through the food web, then is returned to the soil or to the atmosphere. What cycle fits this description?
The nitrogen cycle
