Definition of Germination and types of germination

1. Germination

2. Germination
• Germination is the development of a plant from seed or spore after a period
of dormancy.

3. Structure of the seed

4. Conditions necessary for germination
• Light
• Warmth
• Water
• Air

5. Water
• Water enters the seed through the micro pile and carry out the following
functions.
• Softens the seed coat to make it permeable for gases
• Food material stored in the seed become soluble and diffuse to the embryo
• Enzymes required for growth will only become active in the presence of water

6. • Collect five plastic cups
• Label the cups
• Place water soaked cotton buds in four of the cups
• Place a dry cotton bud in cup labeled E
• Place four pea seed in each of the test tubes
• In container A cover the seeds with cooled boiled water and pour a layer of oil
on the water.
• Place container B in completely closed container put it in a well-lit area
• Place container A beside container B put container C in the same location and
E in the same location.
• Put container D in miss Janet’s refrigerator
• Allow the experiment to run for 6 days

7. Oxygen
• Oxygen is necessary for aerobic respiration. Seeds get energy from the
process of respiration

8. Temperature
• The enzymes in the seeds that carry out reaction for germination works best
within a particular temperature range

9. Parts of the seeds

10. Types of germination
• Epigeal
• Hypogeal

11. Epigeal germination
• Epigeal Germination: In this type of germination, the hypocotyl elongates
rapidly and arches upwards pulling the cotyledons which move above the soil

12. Hypogeal germination
• Hypogeal Germination: In this type of germination, the epicotyl elongates
and the cotyledons remain below the soil.