The correct option is 2 and 3 only.
Explanation
Julius von Sachs was a prominent German botanist who, in 1854, provided crucial evidence regarding the production and storage of food in plants. His work established the fundamental relationship between chloroplasts, light, and carbohydrate synthesis.
Statement-wise Analysis
- Statement 1 is Incorrect. Sachs provided evidence that glucose is produced when plants grow and that this glucose is usually stored as starch, not proteins. The presence of starch is a key indicator of photosynthesis.
- Statement 2 is Correct. His studies demonstrated that the green substance in plants (chlorophyll) is located in distinct special bodies (later identified as chloroplasts) within plant cells, rather than being diffused throughout the cell.
- Statement 3 is Correct. Sachs explicitly found that the green parts in plants are the specific sites where glucose is made. Consequently, non-green parts of the plant are not involved in the primary synthesis of carbohydrates, although they may store them.
Key Takeaway
Julius von Sachs proved that photosynthesis takes place in the
chloroplasts (green parts) of plant cells and results in the production of glucose, which is stored as
starch.