Plant Growth Regulators
Cell division and cell enlargement
Pattern formation and tropic growth
Flowering, fruiting and seed formation
All of these
Match the following columns.
Column IColumn IIAZeatin1 Flowering hormoneBFlorigen2Synthetic auxinCIAA3CytokininDNAA4Natural auxin
A-4, B-1, C-2, D-3
A-3, B-1, C-4, D-2
A-3, B-4, C-1, D-2
A-2, B-1, C-4, D-3
Pick out the correct statements.
I. Cytokinins especially help in delaying senescence.
II. Auxins are involved in regulating apical dominance.
III. Ethylene is especially useful in enhancing seed germination.
IV. Gibberellins are responsible for immature falling of leaves.
I and III
I and II
II and IV
I and IV
Plant hormones are
All of these
Match the following columns
Column IColumn IIA.Human urine1.CytokininB.Gibberella fujikuroi2.AuxinC.Herring fish DNA3.EthyleneD.Ripening of fruits4.Abscisic acidE.Aged leaves of plants5.Gibberellins
(A)→(2), (B)→(5), (C)→(1), (D)→(3), (E)→(4)
(A)→(2), (B)→(3), (C)→(4), (D)→(5), (E)→(1)
(A)→(1), (B)→(5), (C)→(2), (D)→(4), (E)→(3)
(A)→(3), (B)→(2), (C)→(1), (D)→(5), (E)→(4)
(A)→(5), (B)→(4), (C)→(3), (D)→(2), (E)→(1)
Which of the following is a CORRECT statement?
Robert Hooke isolated auxins
Zeatin is isolated from corn kernels
GA's discovered first in plants
Ethylene is strictly a plant growth inhinitor
One hormone hastens maturity period in juvenile conifers, second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses. They are respectively
- Gibberellin, Auxin, ABA
Gibberellin, Auxin, Ethylene
Auxin, Gibberellin, Cytokinin
Auxin, Gibberellin, ABA.
- Plant growth regulators are also known as phytohormones.
- The regulators are signal molecules produced within the cell.
- They occur in extremely low concentrations.
- Phytohormones are required in high concentrations.
- Flower colour