2 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 commensalism B mutualism C parasitism D predation
4 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
5 Question 4Which substance is considered to be a factor affecting Earth’s ozone layer?A chlorofluorocarbonsB ethyl alcoholC nitrogen gasD water vapor
6 Question 5Which graph represents the maximum carrying capacity of a bacterial colony?