LAQ : Name the site of secretions and functions of the following hormones (i) Auxin (ii) Gibberellin (iii) Cytokinin or Kinin

Question

Name the site of secretions and functions of the following hormones-Plant hormones-(i) Auxin (ii) Gibberellin (iii) Cytokinin or Kinin. 

Answer

Site of secretion and functions of plant hormones:

(i) Auxin

• Site of secretion: Shoot apical meristem
• Functions:
  1. Promotes cell elongation in stems, leaves, and flowers
  2. Regulates apical dominance by suppressing lateral bud growth
  3. Stimulates root initiation and growth
  4. Plays a role in phototropism and gravitropism
  5. Helps in the formation of adventitious roots in cuttings.

(ii) Gibberellin

• Site of secretion: Shoot and root apical meristem
• Functions:
  1. Promotes stem elongation and cell division
  2. Stimulates seed germination and fruit development
  3. Helps in the breaking of dormancy in seeds and buds
  4. Regulates flower development and sex determination
  5. Increases tolerance to abiotic stress.

(iii) Cytokinin or Kinin

• Site of secretion: Root apical meristem
• Functions:
  1. Stimulates cell division and differentiation
  2. Regulates apical dominance by promoting lateral bud growth
  3. Delays senescence in leaves and other organs
  4. Helps in the formation of chloroplasts and thylakoid membranes
  5. Increases tolerance to abiotic stress.