Transcript
Parts of a Seedling
Lima beans
Lima beans have been cultivated in Peru for more than 7,000 years.
The name "Lima," comes from the capital of the South American country of Peru. Historians are unsure whether they originated there or in Guatemala.
The scientific name for lima beans is Phaseolus lunatus.
Epicotyl – contains the plumules at upper end that become part of the stem.
Why do seeds dry up, stay in their seed shape and not fall apart?
Discuss with your partner- QUIETLY!
Dry Lima Bean
observe and write down differences between the dry and wet seeds.
Dry Wet
at least 5!
• micropyle - the small pore in a seed that allows water absorption
• hilum - the scar on a seed coat at the location where it was attached to the plant's stalk during development
• Look at the exterior of the dry and wet bean seed.
• Draw and record what you see. Use your magnifying glass. Print – no cursive Pencil only Draw EXACTLY what you
see Be NEAT and DETAILED Use map pencils only to
color Spell correctly Give your drawing a title Label lines: straight and
parallel to top of page
Dry Lima Bean
hilummicropyle
Label the cotyledon, embryo (if you see one), hilum and micropyle.
Dry Lima Bean
hilummicropyle
embryonic root
cotyledon
Wet Lima Bean
Embryonic Root
embryonic root
Carefully remove the testa
(seed coat).
• Try not to separate the cotyledons
or let the embryo fall out.
Embryo
Cotyledon
Embryo
Cotyledon
You should be able to see the tiny plant embryo and its parts- the embryonic root, embryonic stem and embryonic leaves.
Carefully, slide your fingernails into the seam on the convex (rounded) side of the seam and separate the two large COTYLEDONS.
Inside of a Lima Bean
Hypocotyl Embryonic Stem
Seed coat
Embryonic Root)
Embryonic Leaves
• Use a magnifying lens to locate and observe the embryo inside the seed.
• Look for: the two cotyledons, the embryonic
leaves, the embryonic root the embryonic stem
Cotyledon
Embryonic Root
Embryonic leaves
Embryonic stem
Cotyledon
Inside a Lima Bean
Seed
Lima Bean Seed Drawings
Make sure you include the following:• Seed Coat (Testa)• Cotyledon• Embryonic Root• Embryonic leaves• embryonic stem
Inside of a Lima Bean
Cotyledons
• Embryonic Root
• Embryonic leaves
• Embryonic stem
• Seed Coat (Testa)
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