plant growth & adaptations. plant nourishment photosynthesis requirements water carbon dioxide...
TRANSCRIPT
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Plant Growth & Adaptations
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Plant Nourishment
Photosynthesis Requirements• Water• Carbon dioxide• Sunlight
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Plant NourishmentMacronutrients• Nitrogen
– Overall growth & chlorophyll structure.
• Phosphorous– Root & flower growth.
• Potassium– Root preservation; disease prevention; quality of fruit.
• Calcium– Cell wall; overall strength of plant.
• Magnesium– Chlorophyll structure.
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Plant NourishmentMicronutrients• Iron
– Chlorophyll structure.
• Zinc– Regulation of plant growth.
• Copper– Reproduction; root metabolism.
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FertilizersOrganic Fertilizers• Sheep and cow manure.• Mulch and compost.
Non-Organic Fertilizers• Three numbers (e.g., 24-6-12).– Nitrogen-Phosphorous-Potassium
* What time of the year should “6-6-24” fertilizer be used?
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Wild Seed Speculation• NASA sending seeds into space.• Applications???
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The Doomsday Vault• For safekeeping of the World’s vegetation.
Watch This!!! and This!!!
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Seed GerminationWhen conditions are right…• Gibberellin released.– Enzymes break down starch.– Creates hypertonic condition water rushes in.– Seed coat bursts.– Cellular respiration begins.
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Seed Germination• Radicle pushes down to form roots.• Hypocotyl pushes up to form stem.• Epicotyl & cotyledon grows upward to form leaves.
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Seed Germination
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Plant Adaptations• Desert• Wetlands• Fire-prone areas• Extreme cold• Nutrient-poor soil• Shade
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Desert• Modified leaves
– Thin.– Thick cuticle.
• Photosynthetic stems.• Extensive root system.• Rapid development
during rainy season.
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Wetlands• Floating leaves.• Stomata on upper
epidermis.• Hollow stem for
buoyancy and diffusion of gases.
• Floating seeds.
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Fire-prone Areas• Ashes neutralize acidic
soils.• Extreme heat opens
tough seed coats.• Few competitors.
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Extreme Cold• Longer dormant period.• Deciduous trees lose
leaves.• Flowers act as solar
collectors.– Concentrates solar rays
on ovary…speeds up reproduction.
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Nutrient-poor Soil• Carnivorous.– Capture, kill and digest
insects.– Acquire N, P and K.– E.g., Venus fly trap,
pitcher plant.
• Parasitic.– Absorb water, minerals
and sugars from xylem and phloem.
– E.g., Mistletoe.
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Shade• Bloom early.• Rapid growth.