F5 Biology Chapter 5

Diagram shows a coleoptile tip is cut and placed on agar block.

Then, it is placed inside a box with a hole and exposed to the light source.

What is the observation of this experiment after a week?

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Diagram shows Apis mellifera bees on a flower of dragon fruit plant. Due to a forest fire event, the population of bee vanished from dragon fruit farm. Which of the following is the most suitable method to ensure the continuity if fruit production?

• Rebreed the bees

• Spray auxin on the stigma

• Spray cytokinin on the flower bud

• Replant the cuttings of succulent-like branches

A farmer wants to stimulate the growth of adventitious roots from a stem cutting. Which hormone should he apply to the part of the stem where the stem is cut?

• Auxin

• Ethylene

• Cytokinin

• Gibberellin

Diagram shows a method to speed up the ripening of fruit.

Phytohormone X is trapped in the water proof bag.

What is X?

• Auxin

• Ethylene

• Cytokinin

• Gibberellin

Which of the following phytohormones commonly used in tissue culture technique?

• Auxin

• Ethylene

• Cytokinin

• Gibberellin

Y and Z are phytohormone.

What is Y?

• Auxin

• Ethylene

• Cytokinin

• Abscisic acid

Diagram shows a type of responses that takes place in a plant. Which of the following stimulus cause the plant to response?

• Due to circadian rhythm when the surrounding becomes dark (Nycatinasty)

• Due to sudden mechanical stimulus (Seismonasty)

• Due to stimulus that cause vibration (Thigmonasty)

• Thigmotropism

Diagram shows shoot of a plant grow towards light.

What is the cause of the reaction?

• The shoot needs light for photosynthesis

• The shoot needs to grow longer to avoid competition for light

• Cells shaded from the light elongate faster

• The concentration of auxin is higher in cells exposed to light