Respond to stimuli

Question 1

Use ur knowledge of IAA to explain growth curvature

Answer 1

Tip produce IAA

IAA diffuses to left side of the tip

IAA causes cell elongation to left side

Question 2

Describe how you could compare the IAA concentration in shoot tips from two different species

Answer 2

You could compare by size of shoot

number of shoot tips whole be controlled

size/type of agar block should be controlled

Shoots need to be at the same stage of growth

Time tips kept on agar

Temperature

Repeat experiments multiple time, calculate mean

Question 3

When focused on the fovea, person sees object in colour, why

Answer 3

This is becuase there’s more cones in the fovea, cones detect stimulus, three types of cones. this causes visual acuity

Question 4

Why do cones have high visual acuity

Answer 4

Each receptor in cone is connected to separate neurons

Question 5

Why do people ther parts of retina have high sensitivity to light

Answer 5

Many rods

Rods more sensitive to light

If enough light hits, threshold can be reached and summation occurs