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25 terms

3rd grade science

STUDY
PLAY
organism
a living thing
reproduction
the way organisms make more of their own kind
environment
everything that surrounds an organism; includes air, water, soil and other organisms
respond
to react; when the environment changes, organisms do this
cells
the basic building blocks of life; all living things are made of these
microscope
a device that uses glass lenses and allow people to see very small things
communicate
to share information
cytoplasm
a clear, jelly-like material that fills plant and animal cells
cell membrane
the thin outer covering of the cell; plant and animal cells have this
nucleus
the control center of the cell; plant and animal cells have this
cell wall
a stiff layer outside the cell membrane that only plant cells have
chloroplasts
makes food for the plant cell; they are green
minerals
a naturally occurring substance that is neither plant nor animal
root
the plant part that grows underground; holds the plant in the ground and takes in water and minerals for the plant
stem
the plant part that supports the plant and helps it stand upright
leaves
the main food-making part of the plant
chlorophyll
makes the plants leaves green; traps the energy in sunlight for the plant
energy
chlorophyll traps this from the sunlight for the plant
oxygen
a gas that is in air and water; people and animals need this to live
life cycle
all of the stages in an organism's life
plant embryo
a young plant this is just beginning to grow
heredity
the passing of characteristics from parent to offspring
flowering plants
plants that produce seeds in flowers; most plants in the world are these
conifer
trees that produce seeds in cones; pine trees and spruce trees are these
pollen
a powdery material in flowering plants that is needed by the eggs to make seeds