23. Multiple choice questions XXIII

Exercise condition:

3 m.

1. The natural plant hormones were first isolated from

cotton fruits, spinach leaves, rice plant
avena coleoptiles, fungus gibberella
corn germ oil, human urine
human urine, rice plant.

2. If the tip of a seeding is cut off, growth as well as bending ceases because it hampers

perception of light stimulus
respiration
photosynthesis
transpiration

3. A plant bends towards the source of light when exposed to the light on only one side. Which of the following is the best explanation of the phenomena

Some auxin accumulates on the shaded side to induce greater cell elongation on that side
The apices of their stems are attracted by light
Light stimulates the cells on the illuminated side to increase in length
It needs light for photosynthesis

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