1. Which of the following processes is not directly involved in auxin-mediated c

ID: 166525 • Letter: 1

Question

1. Which of the following processes is not directly involved in auxin-mediated cell expansion?

(a) Acidification of cell walls

(b) Decreased cellular solute potential

(d) Production of cellulose microfibrils

2. Which of the following sensory signals is used to control the timing of plant germination?

(a) Auxin levels in the seeds

(b) Auxin levels in the roots

(d) The PHOT1 receptor

(e) Cytokinin levels in the seeds

3. During the gravitropic response:

(a) Auxin acts to inhibit cell growth

(b) Cytokinin induces the cell elongation

(d) Abscicic acid accumulates at the ‘bottom’ of cells

4. If you wanted to delay barley seed germination you would:

(a) Increase seed expression levels of alpha-amylase

(b) Treat seeds with salicylic acid

(d) Treat seeds with ABA (abscicic acid)

(e) Treat seeds with auxin

5. If you wanted to decrease transpiration rates in a plant you would:

(a) Treat them with auxin

(b) Expose them to blue light

(d) Expose them to red light

(e) Treat them with cytokinins

6. If you wanted to extend the life span of a tree leaf, you would:

(a) Decrease the amount of auxin in the leaf tissue

(b) Increase the amount of brassinosteroids in the leaf tissue

(d) Decrease the ratio of ethylene to cytokinins in the leaf tissue

7. Which of the following hormone is most directly involved in plant pathogen responses:

(a) Abscicic acid

(b) Auxin

(d) Gibberellins

(e) Systemin

2. The Pr / Pfr phytochrome ratio is used to control the timing of plant germination.

3. During the gravitropic response: Auxin acts to inhibit cell growth.

4.To delay barley seed germination you would: Treat seeds with ABA (abscicic acid).

5. To decrease transpiration rates in a plant you would: Treat seeds with ABA (abscicic acid).

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