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Notes Mar 16th- exam 2

Notes Mar 16th- exam 2 - E ndosperm has 3 sets of...

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Endosperm- has 3 sets of chromosomes. Triploid. Seed storage for proteins, carbohydrates, nucleic acids 1 pollen+1 ova= 1 zygote Mechanisms of Pollination Self Pollination * Cross Pollination- pollen from a different plant, greater genetic variation. Male and female mature at different times Wind Vector- co evolution: pollinator and flower have strategies that benefit both Insects, Birds, Bats How to Plants attract Vector Pollinators? Showy Petals Nectar Excess Pollen Sex- Bee Orchids Fragrances Means of Seed Dispersal Wind- fluff, wings Hitchhikers- get onto skin; cenorous, sand spurs, stichtights, burdock Mechanical- exploding/shooting the seeds Edible fruits with seeds- poison ivy berries (rich in oils) Water- coconuts Germination- the break in seed dormancy when the plant begins to grow What factors influence germination?
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Moisture Temperature Oxygen Light- depends on type of plant Gibberellins- hormones which break dormancy which break dormancy and cause germination
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