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| anything in the environment that causes a response |
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| reaction to a stimuli, often involves movement |
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| a plant's response to an external stimuli |
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| plant grows towards the stimulus |
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| plant grows away from the stimulus |
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| a plants response to the number of hours of daylight and darkness |
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| examples of plant stimuli |
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| touch, light (phototropism), Gravity (gravitropism) |
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| control changes in growth |
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| keeps seeds from sprouting and buds from growing in the winter |
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| causes plant stems and leaves to exhibit positive tropism to light |
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| stimulates plant stems to grow and seeds to germinate |
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| causes faster mitosis and cell division in plant growth |
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| stimulates ripening process |
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| 2 traits that all plants have: |
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Definition
| chloroplasts + cell wall- cellulose |
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ex: moss, liverwort
-no specialized tissue/no true roots
-grow close to ground
-rhizoids |
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ex: rose, corn, grass
-specialized tissue/ true roots
-xylem + phloem (see other notecards)
-roots, stems, leaves |
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| transport water and nutrients from the roots |
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| transports sugar and nutrients to the leaves |
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-in-between phloem and xylem
-found in some plants (trees)
-produces new layers of xylem and phloem |
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leaves- fronds
backside of fronds- spores |
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| transport h2o and minerals |
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| for food making (photosynthesis) |
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-anchor plants into the ground
-takes in water and minerals |
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-vascular plants that produce seeds but NOT protected by fruits
-no flowers
-ex: evergreen trees, conifers (cone bearers) |
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-vascular plants that produce flowers, produce fruits with seeds
-2 groups: monocots and dicots |
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-one cotyledon inside their seeds
-flower parts in multiples of three
-long narrow leaves
-scattered bundles of tissue
-ex: corn |
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-two cotyledons inside their seeds
-flower parts in multiples of 4 or 5
-network of veins in leaves
-vascular bundles in rings
-ex: lima bean, sunflower, pea |
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(future plant)
plumule- future leaves
stem
radicle- future root
cotyledon- stored food |
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| pollen grain lands on the style, a pollen tube forms and allows the sperm to travel to the ovules |
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| once pollen reaches the egg |
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| the growth of a plant from a seed |
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