NSEB topic read · 2 min
Read Phloem Loading by Energy Dependence
Oxygen shortage and metabolic inhibitors reveal whether transport needs ATP.
NSEB · Transport in Plants · 1 linked question · 100% coverage
Know this first
Photosynthesis uses light energy to make food in green plant cells; transport tissues move water and sugar where they are needed.
Stomata · Leaf pores for gas exchangeXylem · Water-carrying tissuePhloem · Sugar-carrying tissue
Study deeper: NCERT Biology · Transport in Plants
See it
Track what enters, leaves and moves inside
CO₂ in
Leaf
O₂ out
H₂O rises from roots in xylem · sugar travels from the leaf in phloem
CO₂ enters through stomata; water arrives from roots; oxygen leaves the leaf. Sugar moves from the source leaf to use or storage sites.
Use inhibitor evidence
Photosynthate loading falls when oxygen is scarce or metabolism is inhibited. Respiration cannot supply ATP, so the loading step is active and ATP-dependent—not spontaneous or facilitated diffusion. Choose D.
OlympIQ exam lens
- ✓Oxygen shortage can limit ATP production.
- ✓Metabolic inhibitors support active transport when uptake falls.
OlympIQ trap
Facilitated diffusion uses proteins but does not directly require ATP.
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