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True or false: All plants want lots of light and water
False!
How many estimated plant species exist?
Over 300,000
What are the two general plant categories?
Vascular and nonvascular plants
What are the two major types of vessels in the vascular system of plants?
Xylem and phloem
What is the function of xylem?
The xylem carries water upwards from the roots to the leaves
What is the function of the phloem?
Phloem carries sugar from the leaves to the roots
What is an informal term for nonvascular plants?
Bryophytes
What are the three phyla of nonvascular plants?
Liverworts, hornworts, and mosses
What are the three categories of vascular plants?
Seedless vascular plants, gymnosperms, and angiosperms
What does "gymnosperm" mean?
Gymnosperm means naked seed
What makes angiosperms different from gymnosperms?
Angiosperms are flowering plants!
What percentage of plants do angiosperms represent?
90% of all plants!
What are the two subcategories of angiosperms?
Monocots and eudicots
What is the name for the openings on leaves that allow for gas exchange?
Stomata
What do guard cells do?
Determine whether a stomata should be open or closed
Why do plants close their stomata at night?
To conserve water!
