Seed Germination and Water Uptake Quiz

What is the initial phase of water uptake by a mature dry seed called?

• Phase III, seedling growth

• Phase IV, maturation

• Phase II, plateau

• Phase I, imbibition

What causes the temporary leakage of ions and low-molecular weight metabolites from the seed during Phase I of water uptake?

• Mitochondrial development

• Protein synthesis

• Membrane phospholipid transition

• Hydration of the embryo

What lipid is produced by a membrane-bound NAPEsynthase to stabilize and enhance cellular compartmentation during imbibition?

• Sphingomyelin

• Ceramide

• N-Acylphosphatidylethanolamine

• Phosphatidylcholine

What is one of the first activities to resume in a germinating seed?

• Photosynthesis

• Respiration

• Cell division

• Protein synthesis

What is the usual event that terminates germination and marks the beginning of seedling growth?

• Protein synthesis

• Cell division

• Radicle protrusion

• Mitochondrial development

What process is responsible for the emergence of the radicle during germination?

• Cell division

• Photosynthesis

• Turgor-driven process

• Protein synthesis

What proteins disrupt the hydrogen bonds linking cell wall polymers to facilitate radicle extension?

• 14-3-3 proteins

• Expansins

• H1 ATPases

• Protein kinases

What is the result of cell extension during radicle protrusion?

• Decreased turgor pressure

• Increased DNA synthesis

• Mitochondrial biogenesis

• Cell wall loosening

What is the main influence on the kinetics of water uptake by the structure of the seed?

• Cell division

• Seed structure

• Protein synthesis

• Embryo growth

What is the main function of the glycolytic and oxidative pentose phosphate pathways during Phase I of water uptake?

• Mitochondrial development

• Cell division

• Respiration

• Protein synthesis