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AEBI 210- Nov 2nd, 7th.doc

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McGill University
Biology (Agric & Envir Sc)
AEBI 210
Jaswinder Singh

Organisms 1- AEBI-210 001 November 2nd, 2012 Fruit and Seed Dispersal Fruit: The ovary matures into fruit, while the ovules become seeds after fertilization Simple fruit comes from one ovary -A drupe has one seed (plum, peach) -A berry is juicy (grape, tomato) Aggregate fruit or berries come from separate ovaries in one flower -Strawberry, raspberry Multiple fruit is formed from flower clusters -Pineapple, fig Accessory fruit has some tissue derived from a tissue other than the ovary -Apple, pear Seed Dispersal: The further seeds are dispersed, the more a population will grow Competition is reduced the farther away seeds are from the parent plant Animals should be discouraged from ingesting the seeds Seeds are dispersed by wind, animals, water, and by splitting open forcefully Wind disperses seeds that are small, light, dry and wing-like (pine, maple) Water disperses small, hard, dry seeds that float until they reach shore (bean) Squirrels and insects bury seeds (acorns, trillium) Seeds get stuck to animal fur, and are carried far from the parent plant (cockle bur) Dwarf mistletoe seeds shoot out at 100km/h, touch-me-not pods spring seeds away Biochemical Evolution: Secondary metabolites to protect against herbivores have been evolved in angiosperms Co-evolution between mutualistic species has occurred November 7th, 2012 Algae and Lifecycles Organisms 1- AEBI-210 001 Protista: Part of domain Eukarya Include algae, protozoans and uni
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