KERALA PSC / BIOLOGY / GROWTH REGULATORS OF PLANTS / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

 

KERALA PSC / BIOLOGY / GROWTH REGULATORS OF PLANTS / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

KERALA PSC / BIOLOGY / GROWTH REGULATORS OF PLANTS / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

·      Certain chemical substances regulate the growth and differentiation of plants. These substances are called plant growth regulators or phyto hormones.

·      The auxins induce cell elongation and root initiation

·      Indol – 3 Acetic Acid (IAA) is an important Auxin

·      Stem elongation and dormancy breaking are induced by gibberillins

·      Dormancy is the period in which seeds remains inactive

·      The hormone which helps in flowering of plants – florigen

·      Cytokinins help to induce cell division and cell elongation. (Cytokinins are largely present in coconut water)

·      The plant hormone that controls fruit ripening is ethylene

·      Unripe fruits can be made to ripe before proper time if they are kept in ethylene atmosphere

·      Abscisic acid cures ageing and abscission of leaves

·      It inhibits germination of seeds

·      Seed dormancy is due to abscisic acid

KERALA PSC / BIOLOGY / GROWTH REGULATORS OF PLANTS / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY