Plsc 101 Week Three Notes
Plsc 101 Week Three Notes plsc 101
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This 2 page Class Notes was uploaded by randomchic12 on Thursday March 31, 2016. The Class Notes belongs to plsc 101 at Louisiana Tech University taught by Dr. Paul Jackson in Spring 2016. Since its upload, it has received 40 views. For similar materials see plant science in Botany at Louisiana Tech University.
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Date Created: 03/31/16
1 Plsc 101 Week Three Notes Stems Stem functions: conduct water & nutrients from soil through xylem vessels conduct food materials through phloem from leaves to other parts of plant support & protect plant organs display leaves & flowers contains nodes that are enlarged areas on stem where vegetation & buds develop Stem Types Stolons horizontal aboveground stems; runners Bermudagrass, strawberry rhizomes horizontal belowground stems tubers fleshy belowground stem; carbs potato, artichoke bulbs narrow stem surrounded by layers of rings onion, tulip corms compressed, fleshy, solid underground stem crocus, timothy Leaves absorb light during photosynthesis allow cooling during transpiration veins are xylem & phloem parallelveined: monocot netveined: dicot parallelveins parallel to leaf axis (monocots) pinnatenet venation with veins extending from midrib palmatenet venation with major veins diverging from the petiole and leaf blade union leaf whole organ of photosynthesis petiole leaf stalk; connects leaf to stem 2 midrib main vein through center of leaf node joint on stem point of origin of leaf or bud may show ring or leaf scar opposite leaves directly across from each other on stem alternate leaves spaced in alternate fashion along stem whorled three or more leaves present at node e.g. Nerium Oleander; Catalpa bignonioides Inflorescence (stamen = male/ men; pistil = female) perfect contains a stamen and pistil imperfect either a stamen or pistil is missing refer to flower (perfect or imperfect) monoecious same plant has separate stamens and pistils dioecious plant has either stamens or pistils but not both refer to plants (monoecious or dioecious) determinate plant vegetative growth ceases with formation of flowers/fruits; more compact plants ex: tomatoes Better Bush, Roma, Rutgers indeterminate plant vegetative growth can continue after flowers/fruits start forming; larger plants ex: tomatoes Most cherry varieties, Better Boy, Early Girl, most Heirloom varieties Pollination two types of pollination selfpollinated pistil is pollinated with pollen from the same flower or flowers on the same plant ex: wheat, oats, rice, soybeans cross pollinated when pistil is pollinated by pollen from flowers on another plant ex: corn, sorghum, rye, clover