Scribd
Upload
434 views19 pages

Seed Germination Inquiry Pre-Inquiry Investigation

1) The radicle emerges first from the germinating dicot seed and forms the embryonic root. 2) The hypocotyl forms a hook that pushes the cotyledons and epicotyl above ground, protecting the delicate shoot tip. 3) Stages of germination include the radicle emerging and primary roots developing, the hypocotyl straightening and pulling the cotyledons above ground, and the seedling and leaves unfolding and emerging.

Uploaded by

jeetuck
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPT, PDF, TXT or read online on Scribd
434 views19 pages

Seed Germination Inquiry Pre-Inquiry Investigation

1) The radicle emerges first from the germinating dicot seed and forms the embryonic root. 2) The hypocotyl forms a hook that pushes the cotyledons and epicotyl above ground, protecting the delicate shoot tip. 3) Stages of germination include the radicle emerging and primary roots developing, the hypocotyl straightening and pulling the cotyledons above ground, and the seedling and leaves unfolding and emerging.

Uploaded by

jeetuck
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPT, PDF, TXT or read online on Scribd
You are on page 1/ 19

SEED GERMINATION INQUIRY Pre-Inquiry Investigation

DICOT GERMINATION. The RADICLE (embryonic root) is the first organ to emerge from the germinating seed. A hook forms in the HYPOCOTYL, and growth pushes the hook with the attached COTYLEDONS and EPICOTYL above ground. This action protects the delicate shoot tip as it emerges from the soil.

Stages of Germination We have already learned that seeds contain embryonic roots, stems, and leaves, and enough food to keep the plant growing until it has the ability to produce its own food through photosynthesis.

Epicotyl (will become the shootstems and leaves) Radicle (embryonic root) Hypocotyl (connection between cotyledon and radicle) Cotyledon (seed leaf) Note: If the seed has one cotyledon, it is a monocot. Corn is a monocot. If it has two, it is a dicot. A Mung bean is a dicot.

Once germination requirements have been met, these embryonic plant parts begin to grow. Botanists are still debating whether cell expansion or cell division is responsible for this growth. Either way, the following process takes place:

1) The radicle pushes through the seed coat into the soil

2) Primary roots begin to develop and the hypocotyl forms a hook that straightens out, pulling the cotyledons above ground.

3) The emergent seedling begin to straighten out, taking the cotyledons with it.

4) The primary leaves begin unfolding and the stem elongates.

5) The true leaves completely emerge and the cotyledons eventually fall off.

Germination Temperatures for Vegetables and Special Crops Minimum (C) Preferred (C)

beans beet cabbage

8-10 4 4

16-30 10-30 7-35

LABEL THIS DIAGRAM (in your notes)


HYPOCOTYL EPICOTYL

RADICLE

COTYLEDON

SEED COAT

MUNG BEAN

COPY THE DEFINITIONS (into your notes)


Germination - bean: the development of a seed from its embryonic form to the birth of a new plant. Mung bean minimum germination temperature is between 8 10 degrees C. Cotyledon: lobe contained within the seed. Young stem: immature plant. Seed coat: the hard outer shell of the seed. First leaves: first organs of photosynthesis to appear. Radicle: part of the plant from which the root originates. Secondary roots: divisions of the primary root. Hypocotyl: part of the plantlet beneath the cotyledons.

DRAW THIS DIAGRAM in the box in your notes


MUNG BEAN GERMINATION

(hypocotyl) cotyledon epicotyl

radicle
radicle

cotyledon
hypocotyl

You might also like