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Difficulty: MediumHormonal Coordination in Plants and Animals

Match each plant or animal hormone listed in Column I with its corresponding primary physiological action in Column II.

  • Abscisic AcidPromotes stomatal closure during drought stress and maintains seed dormancy
  • EthyleneStimulates fruit ripening and leaf/flower abscission
  • CalcitoninLowers blood calcium levels by stimulating calcium deposition in bone tissue
  • GlucagonStimulates glycogen breakdown in the liver to increase blood glucose concentrations

Answer

Abscisic Acid matches with promoting stomatal closure; Ethylene matches with stimulating fruit ripening; Calcitonin matches with lowering blood calcium levels; Glucagon matches with raising blood glucose levels via liver glycogen breakdown.
Each hormone is paired precisely with its physiological role: Abscisic Acid regulates guard cell turgidity during drought, Ethylene triggers climacteric fruit ripening, Calcitonin regulates calcium homeostasis by promoting bone deposition, and Glucagon triggers hepatic glycogenolysis.

Step-by-Step Solution

1
Identify plant stress regulators and gaseous hormones.
Abscisic acid triggers guard cell turgor loss for closure; ethylene regulates ripening.
Plant growth substances coordinate response to environmental stress and maturation states.
2
Identify endocrine regulation of blood biochemistry in animals.
Calcitonin reduces serum calcium, whereas glucagon mobilizes glucose stored as liver glycogen.
Mammalian hormones maintain blood ionic balance and glucose homeostasis via target organs.

Key Concept

Hormonal Regulation Mechanisms in Plants and Mammalian Endocrine Systems
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Topics

Hormonal Coordination in Plants and Animals

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