2What are some characteristics of the kingdom Plantae? Why are Plants needed?What are some characteristics of the kingdom Plantae?
3What do plants need in order to survive? Describe a plant’s life cycle.What do plants need in order to survive?
4Algae 50-90% of all photosynthesis Most live in water Unicellular, colonial, or multicellularGreen algae are in the phylum ChlorophytaAncestor of green plantsEx. ChlmydomonasAlgae
5Alternation of Generations Scan picture from textbook
6Gametophyte is the dominant generation Single celled Chlorophyta are considered protists.Multicellular Chlorophyta are plants. Ex. Ulva and spirogyra
7Phylum Bryophyta Nonvascular plants Mosses, liverworts, and hornworts. First land plantsTied to water for reproductionGametophyte is dominant. Sporophyte grows from the top of the gametophyte.Male reproductive structure-antheridiaFemale- archegonium
11The Origin of Vascular Plants- Requirements Seeds for reproduction- protect the developing embryo.Vascular tissue- xylem carries water and phloem carries products of photosynthesisPhylum Tracheophyta- gymnosperms and angiosperms
15Tracheophytes are divided into gymnosperms and angiosperms The seeds of gymnosperms(conifers, cycads, and ginkos), are called naked seeds. Seeds are on the cones of conifers. Male cones are smaller than female cones and usually occur on the same tree. Males have microsporangia and females have megasporangia.
17Angiosperms are flowering plants Gametocyte is found in the flower.The flower is made of layers.Outermost whorl of a flower is called the sepal. It encloses and protects a developing flower.Second whorl forms the flower petals.3rd whorl forms the male gamete.
18The male gamete is made of a filament and an anther containing pollen The male gamete is made of a filament and an anther containing pollen. It is called the stamen.4) The 4th whorl is the female gamete. It is called the pistil or carpel. The pistil has a sticky top called a stigma, and tube for the pollen to travel through called the style, and the ovule in the ovary. When pollination occurs, the seeds are covered with a seed coat for protection.
19The ovary develops into a fruit to nourish the embyro The ovary develops into a fruit to nourish the embyro. It also aids in seed dispersal.Seed dispersal occurs through wind, water, or animals(vector). The ripe fruit eaten by animals, helps seeds become dispersed.
20Coevolution-plants and animals evolved together.
21Major divisions of angiosperms DicotsBranching veins in leavesPetals in 4s or 5sVascular bundles in rings in stemsVascular bundles arranged in X in rootsStems thicken from year to yearMonocotsVeins in leaves are parallelFlower parts of 3sVascular bundles scattered in stemVascular bundles alternate in circle in rootStems don’t get thicker from year to year
223 categories of plant life spans Annuals- have to be planted every year. Ex. Corn, petuniasBiennials- 2 year cycles. Ex. Carrots. The carrot will grow in one year. It takes 2 years for seeds to form.Perennials-grow for many years. Ex. Holly
24Fertilization in angiosperms Double fertilization1 sperm fertilizes the egg to form a zygoteThe other fertilizes 2 polar bodies in the embryo sac to form an endosperm. The endosperm is rich in food to nourish the embryo.
25Plant organs Dermal tissue- outer covering with a waxy cuticle Vascular tissue- conductsGround tissue- anything that isn’t dermal or vascular. Surrounding vascular=cortexInside vascular=pith
26Plant tissues Roots, stems, and leaves needed to live on land. Vascular tissue is xylem and phloemVeins are arranged into vascular bundles.Meristematic tissue is the only plant tissue that divides by mitosis.
27Plant cells Parenchyma cells- most abundant; metabolism Collenchyma- support growing parts of plantsSchlerenchyma- dead; supportXylem and phloem
28Vascular TissueXylem- made of vessel elements, which are wide and must die before they conduct water, and tracheids, which are long and narrow and also must die to work.Phloem- made of sieve tube elements with many holes in them and companion cells, which surround and control sieve tube elements. Sugars move from the sugar source to the sugar sink by diffusion.
29Types of Meristematic Tissue Apical meristem-allows trees to grow tallerCork cambian- allows stems to thickenVascular cambian- allows new vascular tissue to form.Pericycle- allows roots to grow.
31Plant Classification Bryophyta- mosses, liverworts, and hornworts. Pteridophyta- ferns and horsetails.Coniferophyta- conifers. Cycadophyta- cycads. Ginkophyta- ginkosAngiospermophyta, class Monocotyledoneae (irises, lillies, corn, wheat, bananas, etc) and class Dicotyledoneae (trees, shrubs, and most fruit trees)
33RootsTaproots- long, thick primary root with tiny roots hairs. Found in oak and hickory trees, carrots, dandelion, beets, and radishes.Fibrous roots- Found in grasses and many trees.Roots have 3 tissue layers- 1) Epidermis- outermost. 2) Cortex- transports water and nutrients inward. 3) vascular cylinder- contains xylem and phloem.
344 root tip sectionsRoot cap- protects the root and secretes CO2, which forms carbonic acid. This acid dissolves soil and allows the root to push through the soilMeristematic region- growth/mitosisRegion of elongation- meristematic cells form this region, where root cells increase in length, new protoplasm forms, and vacuoles get larger.
354) Zone of maturation- differentiation occurs, forming the mature tissues, xylem, phloem, and the root hairs.
37Leaves Cuticle- waxy layer. Keeps water from evaporating. Epidermis- thin layer that light passes throughPalisade mesophyll- columnar cells with chloroplasts for photosythesis.Spongy mesophyll- loose layer of cells that photosynthesis occurs in. CO2 can move through this layer.
38More of the leafXylem and phloem take water and minerals into the leaf and nutrients out.Stoma (stomata) open and close to let CO2 in and O2 out of the leaf. It has to balance the need for CO2 with the cost of water loss. Guard cells control the opening and closing of stomata.
39Water moves in through the root hairs, through the epidermis and cortex. A Casparian strip divides the cortex and vas. Cylinder. Once water moves through the Cas. Strip, it can’t move back out. This is called root pressure and is one way that water moves through a plant.
40Water movement in plants Root pressure- moves water a short distance.Capillary action- combination of adhesion and cohesion. Short distances only.Transpirational pull- as water evaporates through the leaves, more water moves into those cells by osmosis. This can pull water up a tall tree.
41StemsStems hold leaves up to the sun and conduct substances between roots and leaves.
43Plant HormonesAuxins- produced in the apical meristem and move downward. They stimulate cell elongation. They are also responsible for response to gravity. Roots grow downward, stems grow upwards. Auxins inhibit growth of lateral buds.Cytokinins- stimulate cell division and the growth of lateral buds, and cause dormant seeds to sprout. Root growth.
44Gibberellins- produce dramatic increases in size, particularly in stems and fruits. Seed germination, fruit development, and leaf growth.Ethylene- in response to auxins, fruit tissues release small amounts of this gas. This in turn stimulates the fruit to ripen.Absisic acid- inhibits growth and promotes dormancy.
45PhotoperiodismIt is responsible for the timing of seasonal activities such as flowering and growth.Some plants are short-day plants, some are long-day plants. Some flowers open in the day, others only at night.
46Plant responsesTropisms- response to external stimuli. There are several types.Gravitropism- roots grow down(positive gravitropism) and shoots grow up(negative).Phototropism- plants grow towards light.Thigmotropism-response to touch. Some will have their growth stunted, some will twist to avoid touch, others will grow tendrils into an object.
49SOILA mixture of sand, silt, clay, and bits of decaying animal and plant tissue.Humus- dead plants and animalsTopsoil- made of humus, sand, clay, and minerals. Lots of air spaces.Subsoil- mixture of rocks and inorganic soil particles. There is little air here.Bedrock- solid, can’t be penetrated by plant roots.
50Essential NutrientsPlants need carbon dioxide, water, and inorganic nutrients to grow.The most important inorganic nutrients are nitrogen, phosphorus, calcium, magnesium, and other trace elements.For example: nitrogen is needed for leaf growth and color. Phosphorus is needed for making DNA, roots, stems, flowers, and seeds.
51Reproduction in angiosperms One pollen grain joins with the egg to form an embryo.Another pollen grain joins with the polar nuclei to form the endosperm. The endosperm gives nutrients and moisture to the embryo until it germinates.
53Plant propagation and agriculture CuttingsGraftingBuddingAll of these allow plants to grow without fertilization.
54Fertilization and seed dispersal Both can occur by wind, water, and animals( vector)Fertilization is transfer of sperm or pollen to eggs.Seed dispersal is dispersal of seeds away from the parent plant for growth. This prevents competition with the parent for nutrients, sunlight, and water.
56AP AdditionsStems are made of nodes (point of leaf attachment) and internodes (between nodes)Axillary buds form between the node and stem and may form branchesTerminal bud is at the top of a stemLeaves are made of blades (flat) and petioles (where leaves join the stem)
57Tissue types in the leaf, stem, and root Dermal tissue- single layer that covers the plantVascular tissue- xylem and phloemGround tissue- anything that isn’t dermal or vascular. Internally to vascular tissue-pith. External to vascular tissue- cortex
583 cell types Parenchyma- photosynthesis and other metabolism Collenchyma cells- grouped in cylinders for support.Schlerenchyma- fibers for support on non-growing parts of plants.
60TermsTurgor pressure- pressure exerted against the cell wall when the plant is full of water.Aquaporins- protein channels for the passage of water between plant cells.Tonoplast- membrane surrounding the large central vacuole.Epiphytes- plants that grow on other plants (not parasitic).
61More termsMonoecious- having male and female reproductive structures on the same plant. This may occur in some animals.Dioecious- having separate organisms for each sex (male and female).Microsporocytes or microsporangia- male cellsMegasporocyte or megasporangia- female cells.