Julius von sachs experiment

Q. Julius von Sachs demonstrated that

1. Starch was produced by the assimilation of carbon dioxide
2. Starch was produced by the assimilation of water
3. Starch was produced by the assimilation of ight
4. Starch was produced by the assimilation of oxygen

Q. Julius von Sachs observed that

1. When leaves are kept in darkness, they retained starch
2. When leaves are kept in darkness, they consumed starch
3. When leaves are exposed to sunlight, they produced starch
4. When leaves are exposed to sunlight, they consumed starch

Q. The first person to connect the appearance of starch with the fixation of carbon in the presence of light was

1. von Sachs
2. Priestly
3. van Niel
4. Engelmann