Lecture 6 - Lecture 6 Plants Plants face all of the same...

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Lecture 6 – Plants - Plants face all of the same problems that animals encounter … including the risk of being eaten o Plants face a gauntlet of hungry mouths - Plants can make their own food and animals can not - All parts of a plant are eaten by animals - When you see a plant defoliated you see a siege lost (ie. Plant eaten and the leaves have holes) - When you see a plant untouched, you see a battle won Physical Defences of Plants - Hard surface is a protection (bark on trees) - Trees and other woody plants have external ARMOUR = bark o Lignin = stiff leaves o Sticks and twigs - Some plants have sharp SPINES - Scotch Thistle o SPINES are modified leaves ; can be part or the whole leaf. - Prickly Ash has prickles o PRICKLES are epidermal outgrowths , like hairs (skin that grows out into a prickle) o New buds on plants (like roses) resemble prickles = AUTOMIMICRY - Hawthorns have THORNS o Thorns are modified branches Do Physical Defences Work? Yes.
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