Multiple Choice QuestionsAuxin can be bioassayed by
Avena coleoptile curvature
Hydroponics
Potometer
Potometer
Through their effect on plant growth regulators, what do the temperature and light control in the plants?
Apical dominance
Flowering
Closure of stomata
Closure of stomata
Which one of the following generally acts as an antagonist to gibberellins?
Zeatin
Ethylene
ABA
ABA
What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows?
Green plants need light to perform photosynthesis.
Green plants seek light because they are phototropic
Light stimulates plant cells on the lighted side to grow faster
Light stimulates plant cells on the lighted side to grow faster
Typical growth curve in plants is
sigmoid
linear
Stair-steps shaped
Stair-steps shaped
Typical growth curve in plants is
sigmoid
linear
stair-steps shaped
stair-steps shaped
Phototropic curvature is the result of uneven distribution of
gibberellin
phytochrome
cytokinins
cytokinins
D.
cytokinins
Darwin and his son Francis used germinating oat (Avena sativa) and canary grass (phalaris canaries) seeding in their experiments and hypothesised that when shoots were illuminated from one side, they bent forward the light in response to an influence, that was the tip of the shoot. Paal concluded that the tip secretes a substance, which promotes the growth of part below it. In 1926, Frits Went discovered that some unidentified compound probably caused curvature of oat coleoptile towards the light, i.e, phototropism. The compound (auxin) found by Went is relatively abundant in coleoptile tips.
The technical term used for the androecium in a flower of China rose (Hibiscus rosa siensis( is
monadelphous
diadelphous
polyandrous
polyandrous
Switch
