2018 · Q25
Which one of the following statements is correct?
general-sciencebiology-plants
- AIn photosynthesis by green plants, carbon dioxide is used for making carbohydrate.
- BDuring photosynthesis, plants use oxygen for making carbohydrate.
- CThe carbohydrate generated by plants comes from soil.
- DThe carbohydrate generated by plants comes from urea.
Explanation
In photosynthesis green plants fix carbon dioxide with water, using light energy, to make carbohydrates: 6CO2 + 6H2O → C6H12O6 + 6O2. Oxygen is released as a by-product, not consumed as a raw material (B is wrong). The carbon in plant carbohydrates comes from atmospheric CO2, not from the soil (C is wrong) or from urea (D is wrong). Hence A is correct.