carbon dioxide required for plants taken by the plants from the
Ostem
Oleaves
Oroots
Answers
Answer:
The uptake of C¹⁴O₂ by the roots of intact tomato plants from solution containing Na₂C¹⁴O₃ was studied at different light intensities as well as in darkness. Where plants had previously been "starved" for CO₂ for 12 hours, a higher rate of C¹⁴ uptake was observed than with plants which had been transferred directly from the soil to the radioactive solution. In general, the C¹⁴ content of the roots was slightly higher than that of the shoots. At light intensities under the compensation point and in darkness the C¹⁴ content of the shoots relative to the roots decreased. This was accompanied by release of C¹⁴O₂ during respiration, indicating that the absorbed C¹⁴ was readily translocated upwards and released as C¹⁴O₂ under these conditions. At light intensities above the compensation point no C¹⁴O₂ was released.