9.Carnivorous plants evolved because which of the following nutrients is often extremely limited in their habitats? *
a. carbon
b. carbondioxide
c. oxygen
d. nitrogen
10.Rapid turgor pressure changes in specialized multicellular swellings called ____________ are associated with leaves that move in response to touch or light. *
a. petioles
b. pulvini
c. stipules
d. pudicas