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7 Science Ch 2 Revie

botanist scientist who studies plants
ovule A plant structure in seed plants that contains an egg cell.
embryo the beginning of a new plant
endosperm stored food in a seed
seed coat protective covering of a seed
plumule part of the plant embryo that will become the stem and leaves
radicle part of the plant embryo that will become the root system
cotyledons part of the seed designed for food absorption and storage
germination early growth of a seed
fruit a mature ovary that contains a seed or seeds
photosynthesis a process by which plants use the sun's energy to make food.
seedling a plant which no longer depends on its cotyledons for food
annual A flowering plant that completes its life cycle in one growing season.
biennial A plant that completes its life cycle in two growing seasons
perennial plant that lives from year to year and blooms each growing season
angiosperm flowering plant
gymnosperm nonflowering seed plant
bulb structure made of layers of thick, fleshy leaves surrounding a very short stem
corm thick, vertical, underground stems
rhizone horizontal stems lying along or just under the ground
spike long flower arrangement with clusters attached directly to the stem
umbel arrangement of flowers that have stems of nearly equal length emerging from a common point on the main stem
node place where the leaf attaches to the stem
blade the broad, flat portion of a leaf
sheath Base of the leaf that wraps around the stem, attaches the culm to the blade
stolon a creeping stem that grows along the ground
raceme long flower arrangement with flowers that grow on small stems that branch off the main stem
petiole a stalk that joins the leaf to a node of the stem
sessile leaves with no petioles, but are attached directly to the stem by a sheath
simple leaf plant with only one leaf blade attached to a petiole
compound leaf plant which has more than one leaf blade joined to a petiole
leaflet blades of a compound leaf
leaf margin edges of a leaf
venation vein pattern of a leaf
producer An organism that can make its own food.
consumer animals and people who eat plants
chlorophyll the green pigment of plants that is necessary for photosynthesis
stoma pores on the underside of the leaf
glucose simple sugar that acts as an energy source for cells of living things
taproot system a root system in which the primary root grows straight down and remains larger than the secondary roots that branch from it
fibrous root system a root system in which the primary root remains small and many slender secondary roots grow from it in all directions
root cap A structure that covers the tip of a root, protecting the root from injury
primary growth Plant growth that results in the lengthening of roots and shoots
secondary growth Increase width of stem & roots.
semipermeable membrance a membrane that allows only certain molecules to pass through
Sprengel Christian botanist who discovered that each flower's nectar-producing organs have special colors designed to attract various insects
reproduction primary function of a flower
moisture, favorable temperature, oxygen three main things seeds require to germinate
structure of the flowers and fruits characteristics botanists use to classify flowering plants into families
pea family family of plants that helps return nitrogen to the soil
three basic leaf shapes broad and flat, long and narrow, needlelike or scalelike
two types of compound leaves palmately compound leaves and pinnately compound leaves
osmosis process by which water and dissolved chemicals are absorbed through the cell membranes of root hairs
mechanical dispersal ripened fruit bursts open, scattering the seeds
agent dispersal animals, humans, wind or water currents scatter seeds
opposite leaves two leaves grow from one node on opposite sides of the stem
alternate leaves individual leaves that grow in alternating pattern along the stem
whorled leaves three or more leaves growing from the same node on the stem
rosette a cluster of leaves growing around the base of a plant
starches plants store excess glucose in this form
Created by: Mrs_CC