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Photosynthesis — BIO BOTANY STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11BIO BOTANYPhotosynthesis5 Marks
Question
Distinguish between photorespiration and dark respiration.
✓

Answer

Photo respiration:
  • It takes place in photosynthetic green cells.
  • It takes place only in the presence of light.
  • It involves chloroplast, peroxisome and mitochondria.
  • It does not involve Glycolysis, Kreb’s Cycle, and ETS.
  • Substrate is glycolic acid.
  • It is not essential for survival.
  • No phosphorylation and yield of ATP.
  • $NADH_2$ is oxidised to $NAD^+$.
  • Hydrogen peroxide is produced.
  • End products are $CO _2$ and PGA.
Dark respiration:
  • It takes place in all living cells.
  • It takes place all the time.
  • It involves only mitochondria.
  • It involves glycolysis, Kreb’s Cycle and ETS.
  • Substrate is carbohydrates, protein or fats.
  • Essential for survival.
  • Phosphorylation produces ATP energy.
  • $NAD^+$is reduced to $NADH_2$.
  • Hydrogen peroxide is not produced.
  • End products are $CO _2$ and water.

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