Coordination

What is photoreceptor?

• Respiratory pigment

• Photosynthetic pigment

• Photoreceptor pigment

• Photolytic pigment

What is photoperiodism?

• Plant response to relative length of light and dark period

• Plant response to different seasons

• Plant response to the changes in temperature

• Plant response to different wavelength of light

Example of long day plant?

• Iris

• Chrysanthemum

• Poinsettia

• Corn

What will triggered flowering in long day plant during autumn?

• Long day

• Short night

• Treatment with red light during the night

• Treatment with far red light during the night

Whis is TRUE about short day plant?

• Night length must not exceed critical period to stimulate flowering

• A plant that requires a long period of darkness in order to flower

• High concentration of phytochrome red will inhibit flowering

• High concentration of phytochrome far red will stimulate flowering

Which is NOT TRUE about short day plant related to photoperiodism?

• Excessive phytochrome far red will inhibit flowering

• Phytochrome far red stimulate flowering

• Require high amount of phytochrome far red to flower

• Require low amount of phytochrome far red to flower

What is critical period?

• The period of uninterrupted daylength which controls flowering in plant.

• The continuous duration of light, which must be exceeded in short day plants to stimulate flowering.

• The period of uninterrupted darkness which controls flowering in plant.

• The continuous duration of light, which must not be exceeded in long day plants to stimulate flowering.