Two matching potted plants were set up to investigate how plants respond.
Plant A was mounted on a clinostat and kept rotating continuously, while Plant B was left unrotated. Both plants were then laid on their sides and kept in darkness.
Fig. 4.1 shows the two plants at the beginning of the investigation and after seven days.
(a)[1]
State the name given to the response shown by the shoot of plant B.
(b)[2]
Explain why plant A was rotated continuously.
(c(i))[1]
State the name of the plant hormone that produces the response of the shoot of plant B.
(c(ii))[3]
Explain how the plant hormone brings about the response of plant B.
(d)[3]
Explain the advantages that this response gives to seedlings and mature plants for survival.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “geotropism” …