List five main groups of natural plant growth regulators. Write a note on discovery,physiological functions and agricultural/horticultural applications of any one of them.
(N/A) The five main groups of natural plant growth regulators are:
$(i)$ Auxins
$(ii)$ Gibberellins
$(iii)$ Cytokinins
$(iv)$ Ethylene
$(v)$ Abscisic acid
Note on Auxins:
Discovery: Charles Darwin and Francis Darwin observed that canary grass coleoptiles bent toward light. Later,$F$.$W$. Went isolated auxins from the tips of oat seedlings.
Physiological functions: They promote cell elongation,apical dominance,and vascular tissue differentiation. They also induce parthenocarpy.
Agricultural/Horticultural applications: Used as rooting hormones in stem cuttings,as weedicides (e.g.,$2,4-D$),and to induce fruit set in tomatoes.
$(i)$ Auxins
$(ii)$ Gibberellins
$(iii)$ Cytokinins
$(iv)$ Ethylene
$(v)$ Abscisic acid
Note on Auxins:
Discovery: Charles Darwin and Francis Darwin observed that canary grass coleoptiles bent toward light. Later,$F$.$W$. Went isolated auxins from the tips of oat seedlings.
Physiological functions: They promote cell elongation,apical dominance,and vascular tissue differentiation. They also induce parthenocarpy.
Agricultural/Horticultural applications: Used as rooting hormones in stem cuttings,as weedicides (e.g.,$2,4-D$),and to induce fruit set in tomatoes.
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Similar Questions
Match the following columns:
Column-$I$ Column-$II$ $A$. Plant growth promoters $1$. Auxin $B$. Plant growth inhibitor $2$. Gibberellin $3$. Abscisic acid $4$. Cytokinin
Select the correct matching for $A$ and $B$.
| Column-$I$ | Column-$II$ |
| $A$. Plant growth promoters | $1$. Auxin |
| $B$. Plant growth inhibitor | $2$. Gibberellin |
| $3$. Abscisic acid | |
| $4$. Cytokinin |
Select the correct matching for $A$ and $B$.
Medium
View SolutionMatch the plant growth hormones of Column-$I$ with suitable chemical derivatives present in Column-$II$ and choose the correct option given below:
Column-$I$ Column-$II$ $A$. Abscisic acid $(i)$ Adenine derivative $B$. Gibberellins $(ii)$ Indole acetic acid $C$. Kinetin $(iii)$ Carotenoid derivative $D$. Auxin $(iv)$ Terpenes
| Column-$I$ | Column-$II$ |
|---|---|
| $A$. Abscisic acid | $(i)$ Adenine derivative |
| $B$. Gibberellins | $(ii)$ Indole acetic acid |
| $C$. Kinetin | $(iii)$ Carotenoid derivative |
| $D$. Auxin | $(iv)$ Terpenes |
Match the following scientists with their respective contributions:
$(a)$ Maheshwari $(I)$ Pre-sowing treatment of seeds of $Phaseolus$ $aureus$ with $IAA$
$(b)$ Das $(II)$ $Avena$ curvature test
$(c)$ Went $(III)$ Work on seedless fruit in cucumber
$(d)$ Chakravarty $(IV)$ Successful culture of an ovule of $Papaver$ using $IAA$ and kinetin
Select the correct matching sequence:
$(a)$ Maheshwari $(I)$ Pre-sowing treatment of seeds of $Phaseolus$ $aureus$ with $IAA$
$(b)$ Das $(II)$ $Avena$ curvature test
$(c)$ Went $(III)$ Work on seedless fruit in cucumber
$(d)$ Chakravarty $(IV)$ Successful culture of an ovule of $Papaver$ using $IAA$ and kinetin
Select the correct matching sequence:
Medium
View SolutionFill in the blanks:
$(1)$ Maximum growth is observed in ........ phase.
$(2)$ Apical dominance is due to .......
$(1)$ Maximum growth is observed in ........ phase.
$(2)$ Apical dominance is due to .......
Easy
View SolutionFormative hormone is
Easy
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