Photoperiodism 2007-2008

1.

Photoperiodism
2007-2008

2.

Lesson objectives
Describe the meaning of plant
movement.
Explain the causes of plant movement

3.

Photoperiodism
Photoperiodism is a
response of an organism to
seasonal changes due to day
length.
Photoperiodism affect
reproduction in flowering
plants.

4.

Types of plants according to respond to
light duration:
Short-day plants
2. Long-day plants
3. Day-neutral
plants
1.

5.

Short-day plants
They bloom when days are shorter
and nights are longer
~8-10 hours day and ~14-16 hours of
night
Ex; chrysanthemums, rice, cactus

6.

Long-day plants
They bloom when days are longer
and nights are shorter.
~14-16 hours day and ~8-10 hours of
night
Ex: dill, spinach, carnations

7.

Day-neutral plants
Day length is not so important for
blooming.
5-24 hours of day length
Tomatoes, sunflower, pea plants

8.

Let’s do activity on p83

9.

Homework
Read p.82-83
Literacy on p. 83
New words