Abstract
1. In the chloroplast and cytoplasma isolated from the leaves of Bryophyllun and Raphanus, starch was formed mere in the G-1-P substrate.
2. The formation of starch in the isolated chlroplast and cytoplasma were controlled by the change of physiological factors which has an effect before they are isolating.
3. More starch was formed in the chloroplast and cytoplasma isolated from the leaves kept in the light and in higher temperature than in those from the leaves kept in the dark and in lower temperature.
4. Starch forming activity diminishes earlier in chloroplast than in cytoplasma when the leaves kept in the dark.
5. Starch is easily formed in the chloroplast and cytoplasma isolated from the leaves kept in the dark for many days but exposed again to the light immediately before isolation.
