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.
Stroma in the chloroplasts of higher plants contains
light -independent reaction enzymes
Light -dependent reaction enzymes
ribosomes
ribosomes
The technical term used for the androecium in a flower of China rose (Hibiscus rosa siensis( is
monadelphous
diadelphous
polyandrous
polyandrous
In which one of the following, the male and female gametophytes don't have free -living independent existence ?
Pteris
Funaria
Polytrichum
Polytrichum
One of the commonly used plant growth hormone in tea plantations is
ethylene
abscisic acid
Zeatin
Zeatin
