Examkin

Soru

Zorluk: OrtaPlant Biology and Photosynthesis

To prevent dehydration in dry conditions, land plants close microscopic leaf openings known as stomata. How does closing these pores directly limit the rate of photosynthesis?

  1. A
    It prevents plant cells from taking in oxygen gas required to power the photosynthetic process.
  2. It restricts the intake of carbon dioxide needed to produce sugars.Cevap
  3. C
    It stops root cells from absorbing dissolved minerals across the outer cell wall.
  4. D
    It causes leaves to rapidly exhaust stored sugars by venting excess oxygen.

Cevap

Closing stomata restricts the intake of carbon dioxide needed to produce sugars.
Stomata are adjustable leaf pores controlled by guard cells. During dry periods, plants close these pores to prevent water loss via transpiration. Because carbon dioxide enters leaves primarily through open stomata, closing them restricts CO2CO_2 diffusion into photosynthetic cells, directly limiting the rate of glucose synthesis.

Adım Adım Çözüm

1
Identify the primary biological function of stomata in plant leaves.
Stomata are specialized microscopic pores that regulate transpiration and allow atmospheric carbon dioxide (CO2CO_2) to diffuse into the leaf interior.
Understanding gas exchange mechanisms establishes what material enters or exits through stomata.
2
Determine which chemical reactant of photosynthesis enters via these pores.
Carbon dioxide (CO2CO_2) is a required reactant for the light-independent reactions that synthesize glucose.
Photosynthesis combines water and carbon dioxide in the presence of light to yield glucose and oxygen (6CO2+6H2O→C6H12O6+6O26CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2).
3
Deduce the effect of pore closure on photosynthetic output.
When stomata close to conserve water, internal CO2CO_2 concentrations drop rapidly, starving the photosynthetic machinery of a vital reactant.
Without sufficient carbon dioxide entering the leaf, sugar synthesis decreases or stops.

Anahtar Kavram

Role of stomata in regulating carbon dioxide intake for photosynthetic sugar synthesis
Tahmini Süre:1m 0s
Bu soruyu puanla

Konular

Plant Biology and Photosynthesis

Bu konudan daha fazla soru