2. 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
Phaseoluslunatus.
6. • 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
7.
8. • 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
9. Label the cotyledon, embryo (if you see one),
hilum and micropyle.
Dry Lima Bean
micropyle
hilum
14. Carefully, slide
your fingernails
into the seam on
the convex
(rounded) side of
the seam and
separate the two
large
COTYLEDONS.
Cotyledon
Embryo
You should be able to see the tiny plant embryo
and its parts- the embryonic root, embryonic stem
and embryonic leaves.
15. Inside of a Lima Bean
Hypocotyl
Embryonic Stem
Embryonic Leaves
Embryonic Root)
Seed coat
16. • 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
18. Lima Bean Seed
Drawings
Make sure you
include the
following:
•
•
•
•
•
Seed Coat (Testa)
Cotyledon
Embryonic Root
Embryonic leaves
embryonic stem
19. Inside of a Lima Bean
Cotyledons
•Embryonic Root
•Embryonic stem
•Embryonic leaves
• Seed Coat (Testa)
Notes de l'éditeur
Students will notice that the soaked seed will be larger because it has soaked up water and the seed coat will slip off easily compared to the seed coat of the dried seed. Also, the soaked seed will come apart easily and the dry seed will not. The soaked seed will also feel and smell different from the dried seed.This is a good time to begin talking to students about seed dormancy. Seeds can remain dormant for a very long time, waiting for just the right conditions that would be ideal for the plant to survive. Most seeds need both warm temperatures and moisture to begin germination.Stress the importance of having students draw and label the parts of their lima bean seed.