NEETBiologyPlant Growth and DevelopmentMCQ+4 / −1
Dr. F. went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly-cut coleoptile stumps. Of what significance is this experiment?
- AIt made possible the isolation and exact identification of auxin.
- BIt is the basis for quantitative determination of small amounts of growth-promoting substances.
- CIt supports the hypothesis that 1AA is auxin.
- DIt demonstrated polar movement of auxins.
View written solutionFree
Correct answer: A
Charles Darwin and his son Francis Darwin observed that the coleoptiles of Oat (Avena sativa) and canary grass (Phalaris canariensis) responded to unilateral illumination by growing towards the light source (phototropic curvature or phototropism). After a series of experiments, it was concluded that the tip of the coleoptile was the site of production of a substance, that caused the bending of coleoptile.
More from Plant Growth and Development
- Which one of the following growth regulators is known as 'stress hormone'?2014 · MCQ
- A few normal seedlings of tomato were kept in a dark room. After a few days they were found to have become white -coloured like albinos. Which of the following terms will you use to describe them?2014 · MCQ
- The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application of2013 · MCQ
- During seed germination its stored food is mobilized by2013 · MCQ
- Vernalization simulates flowering in2012 · MCQ
- Which one of the following generally acts as an antagonist to gibberellins?2012 · MCQ
- Through their effects on plant growth regulators, what do the temperature and light control in the plants?2012 · MCQ
- Root development is promoted by2010 · MCQ