Lecture 4 - 03:26 I.Pollination Selfpollination...

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03:26 I. Pollination Transfer of pollen from the anther to the stigma Self-pollination Cross pollination Pollinator Attractants Color  Bees: yellow, blue and purple Bird: red Night visitors: white, pale colors Nectar guides  Scent Nectar Sugary liquid produced in nectaries  Pollination steps Pollen lands on stigma from anthers Pollen tubes forms and grows down the style  Pollen fertilizes the ovule  Fruits: Sexual Progeny Ripened ovary that generally contains seeds Fleshy : peach
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Simple Aggregate Multiple Dry : nut Dehiscent : When seed ripens, it will shatter (grains) Indehiscent : Seed never dries out (corn) Simple: Berry - a simple fleshy indehiscent fruit derived from ovary  Tomato  Pepo – modified berry characteristics of members of Cucurbit family   have hard rein  around them  Cucumber, cantaloupe, watermelon  Pome – fleshy indehiscent fruit in which receptacle enlarges becoming edible Apples  Drupe – fleshy indehiscent fruit with a stone and generally one seed  Plum, peach  Hesperidium- modified berry common in citrus  Oranges, grapefruit   citrus  Complex: Aggregate – fleshy indehiscent fruit 
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Often aggregate of druplets or barriers  Multiple – fleshy indehiscent fruit that results from fusion of multiple flowers  Pineapple Dry:  Dehiscent  Follicle  Legume Capsule   Indehiscent  Sunflower (dried seeds)  Grains Samara – from maples  II. Plant Organs: Unique features of plant cells Cell wall: Rigid, made up of cellulose, very rich in carbohydrates, much harder to digest  Provide cellulosic ethanol  Renewable energy
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