BIOLOGY
HORMONES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Auxin stimulates shoot cell elongation at low concentrations.
|
|
|
Auxin stimulates root cell elongation at high concentrations.
|
|
|
Stem growth is stimulated by the same amount of auxin that stimulates the growth of roots
|
|
|
In some plants, the amount of auxin that promotes shoot growth inhibits root growth.
|
Detailed explanation-1: -Auxins are organic substances, which promote the growth and development of plants at low concentrations. Auxins regulate numerous developmental processes in plants including cell expansion, root initiation, vascular tissue differentiation, bud and flower growth (Davies, 2013).
Detailed explanation-2: -Correct option: a IAA and IBA are natural but NAA 2 4-D and 2 4 5-T are synthetic auxins. Explanation:Natural auxin are naturally occurring auxin plants hormone which is called photo hormones. Eg.
Detailed explanation-3: -Auxin is an important plant hormone which has direct effect on cell elongation, multiplication, phototactic movements, etc. It is found commercially helpful because of several characters like: callus formation, curvature of stem and induction of growth of root in stem cuttings.
Detailed explanation-4: -Auxin regulates plant growth. It stimulates cell elongation in stems. Auxins also play a role in cell division and differentiation, in fruit development, in the formation of roots from cuttings. Thus, the correct option is D) All of the above.