PATTERNS OF PATTERNS OF GROWTHGROWTH

3 PATTERNS3 PATTERNS

PLANTS ARE PLACED INTO 3 PLANTS ARE PLACED INTO 3 GROUPS ACCORDING TO HOW LONG GROUPS ACCORDING TO HOW LONG IT TAKES THEM TO PRODUCE IT TAKES THEM TO PRODUCE FLOWERSFLOWERS ANNUALSANNUALS BIENNIALSBIENNIALS PERENNIALSPERENNIALS

ANNUALSANNUALS

COMPLETE THEIR COMPLETE THEIR LIFE CYCLE IN ONE LIFE CYCLE IN ONE GROWING SEASONGROWING SEASON THEY GROW , THEY GROW ,

PRODUCE PRODUCE FLOWERS THEN FLOWERS THEN DIEDIE

EX. MARIGOLDS, EX. MARIGOLDS, PETUNIAS AND PETUNIAS AND MOST GRAINSMOST GRAINS

BIENNIALSBIENNIALS Complete their life cycle Complete their life cycle

in two growing seasonsin two growing seasons 11stst season-produce roots season-produce roots

stems and leaves all stems and leaves all dies except the rootsdies except the roots

22ndnd season- leaves and season- leaves and stems grow back and stems grow back and produce seeds and produce seeds and flowers, then it diesflowers, then it dies Ex. Beets, carrots, celeryEx. Beets, carrots, celery

PERENNIALSPERENNIALS

Come back to life every Come back to life every yearyear Leaves and stems die Leaves and stems die

each year and are each year and are renewed each springrenewed each spring

Ex. Lilacs, rhododendron Ex. Lilacs, rhododendron bushes, begoniasbushes, begonias

TROPISMTROPISM

STIMULUS: something STIMULUS: something in a plants environment in a plants environment that causes a reactionthat causes a reaction Plants will change the way Plants will change the way

it growsit grows

TROPISM: growth of a TROPISM: growth of a plant towards or away plant towards or away from a stimulusfrom a stimulus

TROPISMTROPISM

What causes the What causes the bending?bending? Uneven growth of Uneven growth of

cells along the cells along the outside of stemoutside of stem

The cells on the The cells on the shadier side elongate shadier side elongate faster than those on faster than those on the lit side, and the the lit side, and the plant bends toward plant bends toward the light the light

TROPISMTROPISM

POSITIVE tropism: grows towards the POSITIVE tropism: grows towards the stimulusstimulus Ex. Plant bends towards the sunEx. Plant bends towards the sun

NEGATIVE tropism: grows away from the NEGATIVE tropism: grows away from the stimulusstimulus Ex. Roots grow away from the sunEx. Roots grow away from the sun

2 TYPES OF TROPISM2 TYPES OF TROPISM

PHOTOTROPISM: Growing towards or away PHOTOTROPISM: Growing towards or away from lightfrom light EX. An unturned plant will bend towards a windowEX. An unturned plant will bend towards a window

GRAVITROPISM: growing with or against GRAVITROPISM: growing with or against gravitygravity Roots: positive gravitropism…grow downRoots: positive gravitropism…grow down Stems: negative gravitropism…grow up Stems: negative gravitropism…grow up