Phototropic curvature is the result of uneven distribution of :
Correct answer: D. Auxin
- A. Gibberellin
- B. Phytochrome
- C. Cytokinins
- D. Auxin
Explanation
Phototropic curvature is the result of uneven distribution of auxin. Charles Darwin and his son Francis Darwin observed that the coleoptiles of canary grass responded to unilateral illmination by growing towards the light source (phototropism). After a series of experiments, it was concluded that the tip of coleoptile contain auxin that caused the bending of the entire coleoptile in relation to the direction of light.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Growth and Development
Embryonic development covers fertilization, cleavage, formation of the blastula and gastrula, germ layers, organ formation and differentiation. Regeneration describes the replacement of lost tissues or body parts, whereas ageing involves gradual cellular and physiological changes linked to reduced repair, altered metabolism and declining organ function.
Practise Growth and Development
230 free Growth and Development MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Growth and Development questions
Vernalization stimulates flowering in :
Which one of the following generally acts as an antagonist to gibberellins?
Through their effects on plant growth regulators, what do the temperature and light control in the plants ?
Photoperiodism was first characterised in :
Coiling of garden pea tendrils around any support is an example of :
One of the commonly used plant growth hormone in tea plantations is :