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15 Cards in this Set
- Front
- Back
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bisexual flower |
contains both functional stamens and carpels |
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unisexual flower |
lacks either stamens or carpels --carpellate --staminate |
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carpellate flower |
female flowers possess carpels, but no stamens |
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staminate flower |
male flowers stamens, but no carpels |
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Double fertilization- each mature pollen grain contains two cells: |
-A generative cell (2n)-->2 sperms (n) -A tube cell--> pollen tube (through which sperms travel to meet the ovule) |
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Double fertilization- each ovule contains
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-An ovum(n)-->to be combined with 1 sperm to form a zygote (2n) -Two polar nuclei (n)--> to be combined with the other sperm to form a triploid cell (3n) |
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seed development |
begins with: -zygote (2n)--> embryo (root apex, shoot apex, cotyledons) -triploid cells (3n)-->endosperm (the food source) |
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In monocots seed |
-endosperm is separated from the cotyledon |
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in dicot seed |
-the cotyledons contain the endosperm |
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Categories of fruit |
-simple fruit: from 1 flower with single ovary -aggregate fruit: from 1 flower with multiple ovaries -multiple fruits: from a cluster of flowers |
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Accessary fruit |
in which some of the flesh is derived not from the ovary, also referred as "false fruit"
-->a pear's "core" is derived from the ovary, but the flesh is formed from accessary tissue -->strawberry: contains many individual seeds- each derived from a carpel of the flower-also as an aggregate fruit |
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Types of fruit formed from one ovary |
-dry indehiscent -dry dehiscent -fleshy |
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dry indehiscent
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-at maturity dry; does not split open --achene: sunflower --grain: corn, wheat --samara: maple, elm --nut: walnut, hazelnut |
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dry dehiscent |
-at maturity dry and splits open --legume: beans, peas --capsule: cotton, poppy |
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fleshy
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-mostly fleshy at maturity; do not usually split open --drupe: plum, peach --berry: tomato, grape --pome: pear, tomato |
