Concepts 9.1-9.3 (Physiology)

Question 1

Define a signal

Answer 1

Any act or structure that influences the behaviour of other organisms (receivers), and which evolved specifically because of that effect

Question 2

Define a cue

Answer 2

An incidental source of information that may influence the behaviour of a receiver, despite not having evolved under selection for that function

Question 3

What are some abiotic environmental changes?

Answer 3

Temperature, humidity, sunlight

Question 4

What are some biotic environmental changes?

Answer 4

Abundance of food, competitors, predators/pathogens/parasites

Question 5

What are the four main types of sensory receptors?

Answer 5

Chemoreceptors, thermoreceptors, mechanoreceptors, photoreceptors

Question 6

What is the phytochrome photoreceptor Pr?

Answer 6

Absorbs red light and converts it to Pfr (usually during day)

Question 7

What is the phytochrome photoreceptor Pfr?

Answer 7

Absorbs far-red light and converts back to Pr (usually at night)

Question 8

What kind of light is more abundant in sunlight?

Answer 8

Red light

Question 9

What is the purpose of amyloplasts?

Answer 9

Produce, store and breakdown starch in plants

Question 10

What is the difference between positive and negative thigmotropism?

Answer 10

Positive = plant grows towards touch stimuli
Negative = plant grows away from touch stimuli

Question 11

What is the difference between positive and negative gravitropism?

Answer 11

Positive = plant grows in direction of gravity
Negative = plant grows away from gravity

Question 12

What are the three main levels of the somatosensory system?

Answer 12

Receptor, circuit, perceptual

Question 13

Which sensations are not detected by the somatosensory system?

Answer 13

Vision, hearing, taste and smell