Photoperiodism
Chapter Name : Plant Growth And Development |
Sub Topic Code : 103_11_15_05_01 |
Topic Name : Photoperiodism |
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Sub Topic Name : Photoperiodism |
|
Introduction
Photoperiodism is the physiological reaction of organisms to the length of day or
night. Photoperiodism can also be defined as the developmental responses of
plants to the relative lengths of the light and dark periods.
Pre-Requisites:
Physiological
reaction, development
Activity:
Observe
the timing of flowering in different flowering plants
Real Life Question:
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Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Photoperiodism | Physiological reaction of organisms to the length of day or night. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Flowering plants | Observe the timing of plant flowering |
Real life uses :
Coordinating
serial events such as flowering in plants
Places to visit :
Garden,
plant nursery
Practical examples around us
| Examples | Explainations |
|---|---|
| Flowering plants | Use the property of photoperiodism to regulate the time of flowering |
What you learn in Theory:
Photoperiodism is a biological
response to a change in the proportions of light and dark in a 24-hour daily
cycle. Plants use it to measure the seasons and to coordinate seasonal events such
as flowering.
Based
on the critical photoperiod the plants can be divided into 3 categories :
Long
Day plants
Short
day plants
Day neutral plants
What you learn in Practice:
Photoperiodism
is used by plants to coordinate seasonal events such as flowering