Lesson Worksheet: Hormones in Plants Biology

In this worksheet, we will practice describing the importance of auxins in plant growth and development and explaining the action of auxin in plant phototropism.

Q1:

In light of your study of auxins, which of the following would most likely be their main commercial use in agriculture?

  • AInhibiting the growth of roots so that crops would need a smaller amount of water
  • BProtecting the crops from birds and pest insects due to their toxic effect
  • CStimulating the vertical growth and the development of different parts of the plant
  • DDirecting the growth of the shoots of crop plants towards the sunlight to track the direction of the Sun

Q2:

Where in a plant are the highest concentrations of auxins found?

  • AIn the guard cells of the stomata
  • BIn the wall of the xylem
  • CIn the tip of the stem
  • DIn the pollen of the flowers

Q3:

The diagram provided shows the effect of IAA (a type of auxin) on the growth of a plant shoot. What effect does IAA have on the cells in the shoot?

  • AIAA helps break down dead cells in the stem.
  • BIAA encourages cell elongation.
  • CIAA prevents cell growth.
  • DIAA stimulates cell differentiation.

Q4:

In high concentrations, what effect do auxins have on cells in the root?

  • AAuxins inhibit cell elongation and growth in the root.
  • BAuxins stimulate cell elongation and growth in the root.
  • CAuxins have no effect on the growth of root cells.

Q5:

In plants, the high concentrations of auxins affect the cells of the root by their growth and affect the cells of the stem by their growth.

  • Ainhibiting, slowing
  • Bincreasing, also increasing
  • Cinhibiting, increasing
  • Dincreasing, inhibiting

Q6:

The provided diagram shows a coleoptile undergoing light tropism.

If we took a tissue sample from side A and side B to quantify the concentration of auxins in each side, what should we expect to find?

  • AThe samples from both sides will have equal levels of auxins.
  • BThe samples from both sides will have no auxins at all.
  • CThe sample from side A will have more auxins than that from side B.
  • DThe sample from side A will have less auxins than that from side B.

Q7:

Shoots and roots respond differently to the same concentrations of auxins. Which of the following statements correctly justifies the statement of the question?

  • AThe same concentration of auxins might stimulate the elongation of root cells while having no effect on shoot cells.
  • BLow concentrations of auxins stimulate the growth of both the stem and the root but in different directions.
  • CHigh concentrations of auxins stimulate the growth of both the stem and the root but in different directions.
  • DThe same concentration of auxins might stimulate the elongation of shoot cells while having no effect on root cells.

Q8:

If the seedling in the diagram is to perform a typical phototropism, on which sides of the stem and root should the concentration of auxins be higher?

  • AOn the sides of both the stem and the root away from the light
  • BOn the sides of both the stem and the root facing the light
  • COn the side of the stem away from the light and on the side of the root facing the light
  • DOn the side of the stem facing the light and on the side of the root away from the light

Q9:

Which of the following is correct about auxin production during phototropism?

  • AAuxins are produced in the illuminated side and diffuse to the shaded side of the stem.
  • BAuxins are produced in the stem tip and accumulate on the shaded side.
  • CAuxins are produced in the shaded side of the stem.
  • DAuxins are only produced in the roots and diffuse to the stem.

Q10:

A plant seedling was put in a cupboard and a single light bulb was hung above it for 2 days. Which of the following would be true about the concentration of auxins on sides of the coleoptile tip?

  • AThe concentration of auxins on the right side would be higher.
  • BThe concentration of auxins on the illuminated side would be higher.
  • CThe concentration of auxins on the left side would be higher.
  • DThe concentration of auxins on all sides would be equal.

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