Botany - Photosynthesis in Higher Plants Question with Solution | TestHub

$P_r$ absorbs yellow light and becomes $P_{fr}$.

${\mathrm{P}}_{\mathrm{r}}$ absorbs red light and becomes ${\mathrm{P}}_{\mathrm{fr}}$.

${\mathrm{P}}_{\mathrm{fr}}$ absorbs red light and becomes ${\mathrm{P}}_{\mathrm{r}}$.

$P_{\text{fr }}$ absorbs yellow light and becomes $P_r$.