A which coleoptiles would bend towards the left a 1

(a) Which coleoptiles would bend towards the left?
A. (1) and (3) only
B. (1) and (4) only
C. (2) and (3) only
D. (2) and (4) only
□
(b) Which of the following statements about coleoptile (5) is correct?
□
## (a)C , (b)D ##
Skills assessed Marks
(a) Analysing data 1
(b) Analysing data 1
|!|BCEMB0160000052|!|

How do auxins cause plant shoots to grow towards unilateral light?
A. increasing cell division on the illuminated side of the shoot
B. increasing cell division on the shaded side of the shoot
C. increasing cell elongation on the illuminated side of the shoot
D. increasing cell elongation on the shaded side of the shoot
□
## D ##
Skill assessed Mark
Applying concepts 1
© 2019 Aristo Educational Press Ltd. 34

HKDSE BIOLOGY: Connecting Concepts Chapter 16
Question bank Multiple-choice questions
|!|BCEMC0160000053|!|
When a plant shoot bends towards sunlight, what process(s) do/does auxins promote in
the cells on the shaded side of the shoot?
(1) mitosis
(2) cell differentiation
(3) cell elongation
A. (1) only
B. (3) only
C. (1) and (2) only
D. (1), (2) and (3) only
□
## B ##
Skill assessed Mark
Understanding basic concepts 1
|!|BCEMB0160000054|!|

SI
The diagram below shows a set-up to study the effect of light on the growth of oat
coleoptiles.
Which coleoptile(s) will bend towards the light source?
A. Y only
B. Z only
C. Y and Z only
D. W, Y and Z only
□
## C ##
Skill assessed Mark
Analysing data 1
© 2019 Aristo Educational Press Ltd.
tip
removed
tip removed
and place on
an agar block
tip removed and
then placed on the
coleoptile again
mica plate
inserted in the
middle
W
X
Y Z
light
black
box
35

HKDSE BIOLOGY: Connecting Concepts Chapter 16
Question bank Multiple-choice questions
© 2019 Aristo Educational Press Ltd. 36

HKDSE BIOLOGY: Connecting Concepts Chapter 16
Question bank Multiple-choice questions
|!|BCEMB0160000055|!|

SI
Which of the following coleoptile will bend towards one side?
□
## D ##
Skill assessed Mark
Analysing data 1
|!|BCEMB0160000056|!|

SI
The diagram below shows the set-ups of an experiment and the results after two days.
© 2019 Aristo Educational Press Ltd. 37