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10-28-2009- Plant- Exam 2 REVIEW answers- last page

10-28-2009- Plant- Exam 2 REVIEW answers- last page - o...

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- Structure of a Mature Seed o Embryo- result of the sperm and egg fertilization o Endosperm- result of the sperm and 2 polar nuclei fertilization; contains nutrients o Cotyledons- can have 3 main functions: Absorption of nutrients from the endosperm (monocots- this is the only function) Transfer of stored and absorbed nutrients to developing seed Photosynthesis after emergence and development to thin leaf-like tissues (however, this function is usually limited due to the thickness of cotyledons) o Seed Coat- hard protective coating surrounding embryo and endosperm o Epicotyl- above the embryonic axis; where the cotyledons are attached; consists of the shoot tip and a pair of miniature leaves o Hypocotyl- below the embryonic axis o Radicle- at the bottom of the hypocotyls; embryonic root - Seed Germination o What is germination?
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Unformatted text preview: o What is imbibition? What can it stimulate? Imbibition is the uptake of water; it can stimulate germination and the release of hormones o If a seed is NOT dormant what is needed for seed to germinate? Just water and a moderate temperature in order to initiate imbibition o If a seed is dormant what are some examples of things it might need to germinate? A waiting period (after- ripening) A period of cold temperature (show the passing of winter) Red-Light (however, far-red light will reinforce dormancy) Mechanical scarification (example: going through the gut of an animal) Chemicals (a fire) Hormones o Two plant hormones effective in germination? Gibberellins (GA)- mobilize nutrients; facilitating germination Abscisic acid (ABA)- restricts germination...
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