plant life cycles. alternation of generation – the process of alternating between asexual and...
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![Page 1: Plant Life Cycles. Alternation of generation – the process of alternating between asexual and sexual reproduction Seedless plants begin by releasing spores](https://reader035.vdocuments.mx/reader035/viewer/2022071808/56649f0c5503460f94c1fb4b/html5/thumbnails/1.jpg)
Plant Life Cycles
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• Alternation of generation – the process of alternating between asexual and sexual reproduction
• Seedless plants begin by releasing spores that develop into new plants without fertilization. The new adult plant develops male and female structure that join and fertilize to create a new adult plant.
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• Pollination – the transfer of pollen from the stamen to the pistil
• Pollen- a yellow powder that contains the sperm cells
• Nectar – sweet liquid produced by flowers to attract pollinators
• Self-pollination – a perfect flower with male & female parts pollinates itself
• Cross-pollination- pollen from one plant pollinates the flower on another plant
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Seeds
• Seed has 3 parts– Embryo - the fertilized egg cell developing into a
new offspring– Cotyledon-surrounds the embryo and is its food
supply– Seed coat – tough outer covering that protects the
seed
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• Germination – the process of the seed developing into a new plant
• Monocot- seed with a single cotyledon, parallel vein pattern on leaves, flower petals in groups of three
• Dicot – seed with two cotyledons, leaves have a branched vein pattern, flower petals in groups of 4 or 5
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Conifers
• Conifer – a seed plant with no flowers – Evergreens, pines and firs
• Single tree produces male and female cones• Male pollen cells stick to female cones and
developing egg remains there as it develops into a seed