Question 1Bacteria living in nodules on the roots of legumes

have the ability to fix atmospheric nitrogen into a water-soluble form that plants can use. The bacteria absorb sugar from the plants’ roots. Which describes the relationship between the bacteria and the legume plants?

A commensalismB mutualismC parasitismD predation

Question 2

A. MouseB. HawkC. GrassD. Frog

Question 3The crab Lybia tessellata 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?

A commensalismB mutualismC parasitismD predation

Question 4Which substance is considered to

be a factor affecting Earth’s ozone layer?

A chlorofluorocarbonsB ethyl alcoholC nitrogen gasD water vapor

Question 5Which graph represents the maximum carrying

capacity of a bacterial colony?

Question 6

Questions 7 and 8Questions 8

Questions 9

Questions 10

Questions 11

Questions 12

Questions 13The diagram represents the pyramid of biomass:

Questions 14

Questions 15