Transcript Growth of a Bean Plant

Sprouts Project
MSTL Workshop
Summer 2009
Seeds

The seed absorbs
water, and swells.
Monocot Seed
Monocotyledon Seeds
Embryo with single cotyledon
 Pollen with single furrow or pore
 Flower parts in multiples of three
 Major leaf veins parallel
 Stem vascular bundles scattered
 Roots are adventitious
 Secondary growth absent

Dicotyledon Seed
Dicot
Embryo with two cotyledons
Pollen with three furrows or pores
Flower parts in multiples of four or five
 Major leaf veins reticulated
 Stem vascular bundles in a ring
 Roots develop from radicle
 Secondary growth often present



Growth of a Bean Plant
Seed Germinates
•Radicle is the embryonic root.
It is the first structure to
emerge from the seed
•After about three days,
depending on the temperature,
the radical grows and bursts
through the seed coat.
Root First to Emerge
The radicle grows down
between the soil particles,
its tip protected by cells
that make up the root cap.
 The radicle becomes the
hypocotyl.
 The hypocotyl becomes
primary root.

Cotyledons
Once the radical is firmly
anchored in the soil, the
hypocotyl starts to grow.
 The rapid growth of the
hypocotyl pulls the cotyledons
out of the testa (seed coat) and
through the soil.

Root Hairs
Root hairs appear in the
region where elongation has
ceased.
 Water and salts from the soil
are absorbed by the root
hairs on the radical and pass
to the rest of the seedling.

Lateral Roots
Later, lateral roots develop
from the radical.
 Hypocotyl is the stem-like
portion of the embryo
below the point of
attachment but above the
embryonic root.

Cycle of Bean Plant
Some plants do not have fruit
that the seed grows in, but
have a pod called a bean.
 A bean is the part of the plant
that holds the seeds.
 There are many different kinds
of bean plants but they all
grow in a similar way.

Step One
The bean seed is
covered in a hard
outer shell. (testa)
 When water is added
to the seed, it swells
and the seed bursts
open.

Step Two
As the roots grow, a
stem will also appear.
 The bean uses the food
in the seed to grow.

Step Three
Leaves will grow
on the stem and
stretch towards
the light.
 Roots will grow
down to the soil.

Step Four
The bean seed is the
part of the plant
that is eaten.
 Peas and lima beans
are bean seeds.

Monocots

Monocots include all
grasses and glasslike
plants, plus lilies,
irises, amaryllises,
Monocot Leaves
Usually, but not always,
monocots possess parallelveined leaves, simple blade.
 One example of a monocot
which does not have
parallel-veined leaves is the
Trillium.

Dicot Leaves


Dicots include nearly all our
trees, bushes, vegetablegarden plants (not corn), and
most of our wildflowers.
Dicot leaves are usually netveined, as in the close-up of
the veins in a wild grape leaf
at the right.