Worksheet: Plant Hormones

In this worksheet, we will practice describing the role of plant hormones in plant growth and function.


Plant shoots are positively phototropic. What does this mean?

  • AThey grow toward heat.
  • BThey grow toward light.
  • CThey grow away from light.
  • DThey grow away from heat.


Where in the plant is auxin made?

  • AIn the phloem
  • BIn the tips of roots and shoots
  • CIn the mitochondria of root hair cells
  • DIn the chloroplasts of leaves


Plant roots are positively geotropic/gravitropic. What does this mean?

  • AThey grow toward gravity.
  • BThey grow away from gravity.
  • CThey grow away from other plant roots.
  • DThe grow toward other plant roots.


If there is a high concentration of auxin in the plant root, what effect does it have?

  • AIn high concentrations, auxin stimulates (causes) cell elongation in the root.
  • BIn high concentrations, auxin causes cell walls in the root to break down.
  • CIn high concentrations, auxin has no effect on plant roots.
  • DIn high concentrations, auxin will inhibit (stop) cell elongation in the plant root.


What is the main function of ethene/ethylene in a plant?

  • AInhibiting the loss of leaves
  • BElongating cells along the shaded side of a shoot
  • CInitiating seed germination
  • DStimulating fruit ripening


For the following descriptions, state the plant tropism that is being described.

A plant shoot grows toward a light source.

  • AGeotropism/gravitropism
  • BThermotropism
  • CPhototropism
  • DLightotropism

A plant root grows toward the pull of gravity.

  • AGeotropism/gravitropism
  • BThigmotropism
  • CPhototropism
  • DThermotropism


What is the key scientific term for a change in the environment of an organism that initiates a response from that organism?

  • AVariant
  • BEffector
  • CStimulus
  • DReceptor


Which of the following correctly defines tropism?

  • AIt is a factor that stunts plant growth.
  • BIt is the growth response of a plant toward, or away from, a stimulus.
  • CIt is a method of transporting substances around the plant.
  • DIt is a type of adaptation that plants in tropical habitats have.


What is the main function of gibberellins in a plant?

  • AStimulating the production of new roots
  • BInitiating seed germination and flowering
  • CElongating cells along the shaded side of a shoot
  • DStimulating fruit ripening


The diagram given shows the effect of auxin on a plant shoot.

What effect does auxin have on cells in a plant shoot?

  • AIt causes cell walls to break down.
  • BIt inhibits (stops) growth.
  • CIt stimulates (causes) cell elongation.

On what side of the shoot is the concentration of auxin the highest?

  • AThe sunlit side
  • BThere are equal amounts of auxins on all sides.
  • CThe shaded side

What is the response of the plant shoot?

  • AIt grows away from the light.
  • BIt grows straight upward.
  • CIt grows toward the light.


A student carried out an experiment into the effects of auxin on plants. They took three shoots from the same plant and grew them in different conditions, outlined in the diagram. All shoots were left to grow with a light source for 5 days.

What would the expected result for shoot A be?

  • ATo grow toward the light
  • BTo grow away from the light
  • CTo grow straight upward

What would the expected result for shoot B be?

  • ATo grow straight upward
  • BTo grow toward the light
  • CTo grow away from the light

What would the expected result for shoot C be?

  • ATo grow away from the light
  • BTo grow toward the light
  • CTo grow straight upward

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