Biology Plants

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problems plants had adapting to life on land

1)preventing water loss
2)obtaining enough good and water
3) dealing with wind and weather
4)exposed gametes and embroyos/spores

ancestor of land plants

green algae

the first land plants

mosses and ferns, both are found near water or in very moist areas because the sperm needs a film of water in order to fertilize the egg

only nonvascular plants on earth

mosses

vascular plants

have specialized tissues that transport water up and food down their stems

nonvascular plants

do not have these specialized tissues or stems

byrophyrta

mosses , nonvascular, spores

pterophyta

ferns, vascular, spores

coniferophyta

conifers or gymnoospores, seeds

anthrophyta

flowering plants or angiosporms, fruiting reproductive organs

basic characteristics of plants

1) multicellular
2) eukariotic(have organelles and nucleus)
3) autotrophs
4) cell walls contain cellulose

Leaves

trap sunlight for photosynthesis
food(glucose) is made here and transported to the rest of the plants.
gas in CO2(carbon dioxide), out O2(oxygen) and H2Og(water in vapor form)

Stems

support upright growth

Xylem

special kind of vascular tissue that transports water up from the roots

Phloem

special kind of vascular tissue that transports food down to the rest of the plant

evolution of vascular plants

allowed plants to grow big and tall and live away from water

roots

anchor the plant tot the ground,m absorb water and minerals, and sometimes store excess sugar as starch

flowers

reproductive organs for angiosperms(anthrophyta)

cones

reproductive organs for gymnosperms(coniferphyta)

environmental factors that affect plants

-tropism

phototropism

light, goes towards the light so it is positive tropism

gravitropism

gravity. goes away from gravity so it is negative tropism

Thigmotropism

response to touch

Photoperiodism

temperature(in winter plants become inactive aka dormant)

transpiration

90% of the water absorbed through the roots is lost through the leaves in this process

capillary action

helps draw water up to the leaves for photosynthesis

stomota

openings in the lower epidermis of leaves which allow for gas exchange and help control water loss

gaurd cells

open and close the stomata of the leaves which control the rate of transpiration and water loss

cuticle

protective, waxy layer that covers the leaves, stem, and fruit of plants, and helps prevent water loss

leave modifications

1) needle-like leaves and spines: prevent transpiration(water loss)
2) tendrils: help vines climb
3) needles or thorns: protect plants from herbivores
4) succulent leaves: store extra water

Root hairs

the actual part of the root that absorbs water

Xylem Tissue

goes up with water to transport H2O

Phloem Tissue

comes down with food

Root Cap

protects the root tip

Herbacues Stems

Color: Green
Flexibility: Yes
Photosynthesis: Yes
Bark: No

Woody Stems

Color: Brown
Flexibility: No
Photosynthesis: No
Bark: Yes

tell the age of a tree

counting the rings of the Xylem Tissue

sepal

outermost, green floral parts (protects the budding bloom)

petals

brightly colored parts just inside the sepal

stamen

male reproductive parts made of the anther and filament

filament

long, thing structures that supports the anther

anther

strucutes where the pollen is produced

ovary

flower part that contains one or more ovules

style

stalk with the stigma at the top

stigma

sticky, top portion of the style

pistil/ carpel

female reproductive structure made up of the stigma, style, and ovary

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