Seeds and Seed Germination Seeds and Seed Germination
Seeds and seed germination Seeds and seed germination Seeds are normally the product of sexual reproduction Pollination Fertilization Embryo development Mature seed
Seeds are for propagationSeeds are for propagationThe biological function of seeds is for propagation of the speciesHow does seeds help in propagation of the species?
Diversity among seeds Diversity among seeds Seeds are very diverse in term of size: – Begonia seed weigh 10-20 micrograms – Coconuts weigh more than a kilogram Thousands of Begonia seeds
Diversity among seeds Diversity among seeds In terms of adaptation to survive various environments until conditions are favorable for germination In terms of method of dispersal
Seeds are for propagation Seeds are for propagation Protect the zygote against physically injury Store foods for seedling-- before it becomes independent Remain dormant to survive harsh environment Disperse the seeds to capitalize on their genetic variability Respond to environment cues and germinate at the right time and place
Which kind of seeds can remain viable longer? Seeds of
General features of seeds General features of seeds Embryo – Root and shoot, in a miniature form Food reserves – Allow seedling to grow before it is capable of performing photosynthesis Seed coat – Provides protection from the environment
Monocots and Dicots Monocots and Dicots Flowering plants (angiosperms): Dicotyledonous plants with two seed leaves Monocotyledonous plants with one seed leaf Angiosperms flowering plants Dicots 200,000 species Monocots 50,000 species includes beans, roses, cacti, melons, citrus includes grasses, lilies, orchids, palms
Seed structure Seed structure Cotyledon Plumule Radicle Micropyle Seed coat or testa
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