During an investigation into seedling growth, a student recorded a significant increase in the fresh weight of plants following heavy irrigation, but observed no change in their dry mass. Which of the following best explains why dry mass is considered a more reliable parameter for measuring biological growth than fresh weight?
- Dry mass measures the irreversible accumulation of synthesized organic material and cellular structures, excluding temporary water fluctuations.Cevap
- BFresh weight reflects growth caused by auxins migrating toward and accumulating on the illuminated side of growing shoots.
- CDry mass allows for non-destructive, repeated measurements of the exact same living seedling throughout its development.
- DFresh weight translocates organic nutrients bidirectionally while dry mass translocates water and mineral salts unidirectionally.
Cevap
Dry mass measures the irreversible accumulation of synthesized organic material and cellular structures, excluding temporary water fluctuations.
Growth is defined as a permanent and irreversible increase in size and dry mass resulting from cell division and the synthesis of new organic cellular material. Fresh weight varies considerably depending on water uptake, humidity, and transpiration rates, whereas dry mass measures the actual organic content synthesized by the plant.
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Anahtar Kavram
Measurement of growth (dry mass versus fresh weight)