A biology student investigated the growth of young oat coleoptiles (shoots) in response to light. They set up two groups of coleoptiles in a draught-free room:

Group A: The coleoptiles were placed in a box with a small window on one side, allowing light to enter from a single direction (unidirectional light).
Group B: The coleoptiles were placed on a slowly rotating turntable inside the same box with a small window, ensuring that all sides of the shoots received equal exposure to the light over time.

What biological term is given to a plant growth response where the direction of growth is determined by the direction of a light stimulus?

Explain the role of Group B in this investigation.

Predict the appearance of the shoots in Group A and Group B after 48 hours.

State one abiotic control variable (other than light and draughts) that must be kept constant between both groups.

A biology student investigated the growth of young oat coleoptiles (shoots) in response to light. They set up two groups of coleoptiles in a draught-free room:

Group A: The coleoptiles were placed in a box with a small window on one side, allowing light to enter from a single direction (unidirectional light).
Group B: The coleoptiles were placed on a slowly rotating turntable inside the same box with a small window, ensuring that all sides of the shoots received equal exposure to the light over time.

What biological term is given to a plant growth response where the direction of growth is determined by the direction of a light stimulus?

Explain the role of Group B in this investigation.

Predict the appearance of the shoots in Group A and Group B after 48 hours.

State one abiotic control variable (other than light and draughts) that must be kept constant between both groups.

5.4 Plant hormones

Question 22

Markscheme

5.4 Plant hormones

Question 22

Markscheme

5.4 Plant hormones

Question 22

5.4 Plant hormones Questions

5.4 Plant hormones

Question 22

5.4 Plant hormones Questions