NEW
Font size
WorksheetsPlant hormones
Total questions: 20
Worksheet time: 11mins
A type of plant will grow tendrils and wind round a support. Name this type of reaction.
Tropism.
Nastic response.
Reflex action.
Taxis response.
What is the role of auxin that causes a plant to bend towards light?
The concentration of auxin in the plant increases when there is light.
Auxin causes uniform growth on every stem.
Auxin causes cells that are on the dark side to grow faster.
Auxin causes the increase in the number of plant cells.
The growth hormone that is used to speed up the ripening of fruits for export is
giberellin.
ethylene.
cytokinin.
auxin.
What is the reaction that is shown by the plant in the figure above?
Positive hydrotropism.
Negative phototropism.
Positive thigmotropism.
Negative geotropism.
The figure above shows a mimosa plant. What is the conclusion that can be derived based on the reaction in the figure.
The mimosa plant shows a seismonastic reaction.
The leaf of the mimosa becomes sturgid when touched.
The osmotic pressure in the mimosa cell increases when touched.
The temperature of the glass rod becomes very high until the leaf fades when touched.
The figure above shows the reaction of a plants to a stimulus. What is the reaction shown by the plants?
Thermonasty.
Thigmonasty.
Photonasty.
Seismonasty.
The movement of Euglena sp and Volvox sp. towards moderate light itensity is a type of reaction to an external stimulus. What is the reaction?
Photonasty.
Phototaxis.
Thermonasty.
Phototropism.
The figure above shows four coleoptiles P, Q, R and S that are exposed to unilateral light. After two days, which coleoptile will move towards the light?
P only.
R only.
P and R only.
P, Q and S only.
The figure above shows an experiment
that is done on two plants of the same species. Both plants are left in the open.
What will happen to the two plants after two weeks
I Plant B bends towards the opening of
the box.
II The auxin in stem A is distributed
uniformly.
III The auxin in stem B is not distributed
uniformly.
IV Plant A bends to the right.
I, II and III only.
I, II and IV only.
I, III and IV only.
II, III and IV only.
The figure below above shows an experiment to study the effect of auxin towards the growth of the coleoptiles. Which of the following conclusions are true about the experiment?
I Auxin is produced at the tip of the
coleoptiles and diffuses to the bottom to stimulate
growth.
II The supply of auxin is cut off in the
dark.
III Auxin cannot penetrate a mica plate.
IV Auxin can diffuse through a block of
agar-agar.
I, II and III only.
I, III and IV only.
II, III and IV only.
I, II, III and IV.
Auxins are responsible for _____________ of a plant
Colour change
Watering
Phototropism
Growth
what type of tropism is occurring here?
phototropism
thigmotropism
geotropism
tropictropism
The diagram shows the same plant. Which of the following statements is not true
Plant b will be shorter than plant A
plant b produces lateral branches since the apical bud is removed
plant A shows apical dominance
plant a produces abscisic acid to prevend side branches from forming
which plant hormone produces opposite effects?
dormancy and cotyledons
dormancy and germination
auxin and cytokins
auxins and ethylene
Where is auxin formed
Tip of stem and root
Leaves
Embryo
All
Apical dominance which suppresses lateral bud development is caused by what hormone?
auxin
gibberellin
ethylene
imbibition
Which of the following are plant hormones
Auxin
Cytokinin
Gibberellin
Abcissic acid, ethylene
All
In the story 'Jack and the beanstalk', Jack grew a beanstalk that grew way into the clouds. If I wanted to try and grow one myself, which plant hormone would I give my beanstalk?
Cytokinesis
Ethylene
Auxins
Gibberellins
