usable power

plant’s response to the number of hours of darkness in its environment

substance that acts as a chemical messenger within plants

any change in the environment that causes organisms to respond

response that results in plant

growth toward or away from a

stimulus

occurs

when the life cycle of an organism

alternates between diploid and

haploid stages

immature diploid plant that

develops from the zygote

forms from an ovary and

sometimes other parts of the flower

and contains one or more seeds

haploid and diploid

stages in the life cycle of a plant

process during which a

nucleus and its contents divide

series of chemical

reactions that convert light energy,

water, and carbon dioxide into

glucose and give off oxygen

structure found at the base of

the style that contains one or more

ovules

female reproductive structure

of a seed plant where the haploid

egg develops

female reproductive organ of

a flower

structure that forms

from tissue in the male reproductive

structure of a seed plant and

produces sperm cells

process that occurs when

pollen grains land on a female

reproductive structure of a plant

that is the same species as the plant

that produced the pollen grains

structure made up of an

embryo, its food supply, and a

protective covering

haploid generation of a plant;

a daughter cell produced from a

haploid structure

male reproductive organ of

a flower