Lesson 16 Definitions

Question 1

phloem

Answer 1

the vascular tissue in plants that conducts sugars and other metabolic products downward from the leaves.

Question 2

transpiration

Answer 2

the exhalation of water vapor through the stomata

Question 3

cohesion-tension theory

Answer 3

a theory of intermolecular attraction that explains the process of water flow upwards (against the force of gravity) through the xylem of plants

Question 4

stomata

Answer 4

minute pores in the epidermis of the leaf or stem of a plant, forming a slit of variable width which allows movement of gases in and out of the intercellular spaces

Question 5

xylem

Answer 5

the vascular tissue in plants that conducts water and dissolved nutrients upward from the root and also helps to form the woody element in the stem.

Question 6

pistil

Answer 6

the female organs of a flower, comprising the stigma, style, and ovary.

Question 7

stamen

Answer 7

the male fertilizing organ of a flower, typically consisting of a pollen-containing anther and a filament.

Question 8

tracheophytes

Answer 8

a large group of plants that are defined as land plants with lignified tissues for conducting water and minerals throughout the plant. They also have a specialized non-lignified tissue to conduct products of photosynthesis.