Animal Timing

Which of these is a zeitgeber that keeps the human body clock synchronised with daytime?

• Melatonin

• Suprachiasmatic nucleus

• Blue light

• Low body temperature

Which of these is a zeitgeber that helps keep the human sleep/wake circadian rhythm synchronised with night-time?

• Cold temperature

• Blue light

• Melatonin

• Suprachiasmatic nucleus

What is the name of the hormone that causes the human circadian rhythm response by making you feel sleepy?

• Adrenaline

• Melatonin

• Suprachiasmatic nucleus

• Caffeine

What part of the human brain controls the biological clock?

• Frontal lobe

• Brain stem

• Suprachiasmatic nucleus

The body clock is always accurate and perfectly in time with the environment.

• TRUE

• FALSE

Zeitgebers are external cues from the environment that synchronise the internal clock with the environment.

• TRUE

• FALSE

Which of these is NOT a zeitgeber for the human circadian rhythm?

• Temperature

• Light

• Hormones

What is the length of the endogenous human rhythm?

• 24h perfectly accurate

• 23h too short

• 25.5 too long

What is the period of a circatidal rhythm?

• 24 hours

• 29.9 days

• 1 year

• 12.5 hours

A sandhopper increasing its rate of turning as the tide starts to go out and its left in the sun is an example of:

• Positive hydrotaxis

• Thermokinesis

• Thermokinesis AND klinokinesis

• Thermokinesis AND orthokinesis