Examkin

Soru

Zorluk: ZorGrowth, Development, and Metamorphosis

Match each plant growth phenomenon or developmental regulator on the left with its corresponding physiological function or developmental outcome on the right.

  • Hypocotyl rapid elongationPulls the cotyledons above the soil surface during epigeal germination
  • Epicotyl rapid elongationPushes the plumule upward while cotyledons remain below ground in hypogeal germination
  • Gibberellin synthesis upon seed imbibitionInduces the aleurone layer to synthesize α\alpha-amylase for starch digestion
  • Ecdysone secretion by prothoracic glandsStimulates apolysis and the synthesis of a new cuticle during insect moulting

Cevap

Hypocotyl rapid elongation matches with pulling cotyledons above soil in epigeal germination; Epicotyl rapid elongation matches with pushing the plumule upward while cotyledons stay underground in hypogeal germination; Gibberellin synthesis upon imbibition matches with inducing the aleurone layer to produce amylase; Ecdysone secretion matches with triggering apolysis and cuticle synthesis during ecdysis.
Hypocotyl elongation brings cotyledons above ground (epigeal germination). Epicotyl elongation elevates the plumule while keeping cotyledons below ground (hypogeal germination). Gibberellin signals the aleurone layer to produce α\alpha-amylase during germination. Ecdysone promotes apolysis and cuticle formation during arthropod ecdysis.

Adım Adım Çözüm

1
Analyze seedling germination types
Hypocotyl elongation lifts cotyledons above ground (epigeal), whereas epicotyl elongation leaves cotyledons underground (hypogeal).
The site of stem elongation relative to the cotyledons determines whether germination is epigeal or hypogeal.
2
Evaluate seed dormancy breakdown biochemistry
Imbibition activates gibberellin release from the embryo, targeting the aleurone layer.
Gibberellins stimulate gene transcription of hydrolytic enzymes like α\alpha-amylase to break down stored endosperm starch into soluble glucose.
3
Analyze arthropod growth and hormonal control
Ecdysone directly controls epidermal cell division and cuticle synthesis.
Ecdysone is the primary moulting hormone in insects that coordinates shedding of the old exoskeleton.

Anahtar Kavram

Plant Germination Dynamics, Seed Mobilization Biochemistry, and Hormonal Regulation of Ecdysis
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Konular

Growth, Development, and Metamorphosis

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