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Difficulty: EasyHormonal Coordination in Plants and Animals

Match each plant growth regulator on the left with its primary physiological action on the right.

  • AuxinPromotes cell elongation and apical dominance
  • EthyleneStimulates fruit ripening and leaf abscission
  • Abscisic acidInduces stomatal closure during drought stress
  • GibberellinPromotes seed germination and stem elongation

Answer

Auxin pairs with cell elongation and apical dominance; Ethylene pairs with fruit ripening and leaf abscission; Abscisic acid pairs with stomatal closure during drought stress; Gibberellin pairs with seed germination and stem elongation.
Each plant growth regulator is matched directly to its physiological function: Auxin promotes cell elongation and apical dominance, Ethylene stimulates fruit ripening and abscission, Abscisic acid triggers stomatal closure during drought, and Gibberellin initiates seed germination.

Step-by-Step Solution

1
Identify the primary function of Auxin.
Auxin stimulates cell elongation and apical dominance.
Auxin is synthesized in apical meristems and controls longitudinal growth.
2
Identify the primary function of Ethylene.
Ethylene promotes fruit ripening and leaf abscission.
Ethylene acts as a gaseous growth regulator during organ maturation.
3
Identify the primary function of Abscisic acid.
Abscisic acid induces stomatal closure under water deficit.
Abscisic acid functions as an inhibitory stress hormone during drought conditions.
4
Identify the primary function of Gibberellin.
Gibberellin mobilizes food reserves to promote seed germination.
Gibberellins stimulate the synthesis of hydrolytic enzymes during seed germination.

Key Concept

Physiological Roles of Plant Hormones
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Topics

Hormonal Coordination in Plants and Animals

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