Plant Timing

An oak tree shedding its leaves before the onset of Winter is an example of what kind of rhythm:

• Circadian

• Circanual

• Circalunar

• Circatidal

Cherry blossom trees coordinating flowering for the start of Spring is an example of what kind of rhythm:

• Circadian

• Circalunar

• Circatidal

• Circanual

Dandelions closing their petals up at night time then opening them back up each morning is an example of:

• Nyctinasty with a circadian rhythm

• Phototropism with a circadian rhythm

• Nyctinasty with a circannual rhythm

• Phototropism with a circannual rhythm

Day Neutral plants flower:

• In summer

• In winter

• Whenever

Short Day plants coordinate their flowering in:

• Winter

• Summer

• Whenever

Long Day plants coordinate their flowering in:

• Winter

• Summer

• Whenever

The most predictable zeitgeber for plants to synchronise their rhythms to seasonal change is:

• Temperature change

• Photoperiod change

• Light levels

• Groundwater moisture

In Winter the photoperiod is:

• Short

• Long

In Summer the photoperiod is:

• Short

• Long

Interrupting a long stretch of night with bright light will cause a Short Day plant to:

• Flower

• Not flower