Chapter 23: Structure of The Flowering Plant

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62 Terms

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Functions of Root System

anchor plant into ground, absorb water and minerals, transport absorbed minerals to shoot, storage of food

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Types of Root

tap root, fibrous root, adventitious root

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Radicle

young root

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Tap Root

one main long root that comes from the radicle, present in dicots

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Plants with Tap Roots

dandelion, carrot

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Fibrous Root

formed when radicle dies and leaves equal sized roots coming out of the stem, present in monocots

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Plants with Fibrous Roots

daffodil, grass

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Adventitious Root

these do not grow from the radicle, and are found in odd places

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Examples of Adventitious Roots

ivy, strawberry plant

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Root Zones

zone of protection, meristematic zone, zone of elongation, zone of differentiation

<p>zone of protection, meristematic zone, zone of elongation, zone of differentiation</p>
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Zone of Protection

root cap protects the meristem as it pushes through soil

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Meristematic Zone

region of active cell production where mitosis occurs

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Apical Meristems

found at root and shoot tips, responsible for lengething roots and shoots

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Lateral Meristems

found at side of plants, responsible for the secondary growth of stems and roots

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Zone of Elongation

region of the root or shoot where cells elongate due to newly formed cells absorbing water and plant regulators, contributing to the growth of the plant's length

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Zone of Differentiation

the region of the root or shoot where cells undergo specialization into various cell types, contributing to the formation of different tissues in the plant

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The Shoot System

the part of the flowering plant that includes stems, leaves, and flowers, responsible for photosynthesis, support, reproduction, and transport of nutrients.

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Twig Diagram

terminal bud, lenticel, lateral bud, leaf scar, current years wood, girdle scar, dormant wood bud, last years wood, node, internode

<p>terminal bud, lenticel, lateral bud, leaf scar, current years wood, girdle scar, dormant wood bud, last years wood, node, internode</p>
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Leaves

the main sites of photosynthesis and transpiration, also known as lamina

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Petiole

the stalk that attaches the leaf blade to the stem, supporting the leaf and facilitating transport of nutrients and water

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Sessile

a type of leaf that is directly attached to the stem allowing for a more compact structure

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Parallel Venetion

veins parallel to eachother, found in monocots

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Net Vention

veins are branched, found in dicots

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Plant Tissue

meristematic, dermal, ground, vascular

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Meristematic Tissue

simple cells with no vacuoles, responsible for mitosis

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Dermal Tissue

protective cover on stem, leaves and root, stops entry of pathogenic organisms, designed to absorb water and minerals at root tips

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Adaptation of Dermal Cells

waxy layer to prevent water loss

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Ground Tissue

fills interior of the plant body, stores food and provides strength to the plant

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Vascular Tissue

transport substances within the plant, two types are xylem and phloem

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Xylem

transports water and mineral salts from the roots to the leaves, provide mechanical support, said to be dead

<p>transports water and mineral salts from the roots to the leaves, provide mechanical support, said to be dead</p>
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Xylem and Phloem Location

located in roots, stem, leaves and flowers

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Xylem Types

xylem tracheids, xylem vessels

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Xylem Tracheids

long cells tapered at both ends, contains pits, only found in conifers, contains lignin

<p>long cells tapered at both ends, contains pits, only found in conifers, contains lignin</p>
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Xylem Vessels

form when numerous cells join end to end, wider than tracheids and are stacked together, forms a continuous conducting tube, contains pits, contains lignin

<p>form when numerous cells join end to end, wider than tracheids and are stacked together, forms a continuous conducting tube, contains pits, contains lignin</p>
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Use of Pits in Xylem

allows water and minerals to move sideways from cell to cell

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Use of Lignin in Xylem

structural polysaccharide used to strengthen walls

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Phloem

transports food made in the leaves, companion cells within controls sieve tube element, are elongated cylindrical cells stacked end to end.

<p>transports food made in the leaves, companion cells within controls sieve tube element, are elongated cylindrical cells stacked end to end.</p>
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Sieve Plates

allow cytoplasm to pass from cell to cell, each one has a companion cell connected by cytoplasmic connections

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Monocotyledon

one cotyledon, vascular bundles are scattered, parallel veins, flowers have petals in multiple of 3

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Dicotyledon

two cotyledons, vascular bundles in ring shape, dendritic veins, flowers hace petals in multiples of 4/5

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Tropism

growth response of a plant to a stimulus

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Phototropism

growth of a plant in response to light

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Function of Phototropism

allows plant to recieve maximum amount of light for photosynthesis

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Geotropism

growth in response to gravity

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Function of Geotropism

allows root to get the water and nutrients it needs from the soil, and raises the leaves into light for photosynthesis

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Thigmotropism

growth of a plant in response to contact

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Function of Thigmotropism

gives support to the plant

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Hydrotropism

growth of a plant in response to water

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Function of Hydrotropism

allows plant to get maximum water it can get

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Chemotropism

growth of a plant in response to chemicals

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Function of Chemotropism

allows plants to move towards useful minerals, and away from harmful chemicals

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Plant Growth Regulators

chemicals that interact with one another to control a particular development or response

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Location of Plant Growth Regulators

produced in meristems and transported through vascular systems

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Examples of Plant Growth Regulators

auxins, gibberellins, cytokinins, abscisic acid, ethene

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Auxin

promote cell enlargement and growth, involved in phototropism and apical dominance, can be used to kill weeds

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Gibberellin

causes stem lengthening, mobilise the stored food in germinating seeds, break dormancy in buds and seeds in spring

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Cytokinins

stimulate cell division and trigger leaf growth in spring

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Abscisic Acid

triggers bud and seed dormancy in autumn and inhibits cell growth

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Ethene

promotes ripening of fruit and the fall of leaves, flowers and fruits

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Structure of the Flower

sepal, ovule, ovary, petal, style, filament, stigma, anther

<p>sepal, ovule, ovary, petal, style, filament, stigma, anther</p>
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Stamen

male part of plant, filament, anther

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Carpel

female part of plant, stigma, style, ovary