Question

Chloroplast involvement in photosynthesis was discovered by:
A. Julius von Sachs
B. Mayer
C. Ingenhousz
D. Liebig

Answer 1

Hint: Photosynthesis is the process by which plants form carbohydrates from carbon dioxide, water, and minerals. The carbohydrates formed from this process are stored in the plant body in the form of starch. The starch is used by the plant when it requires energy. The oxygen is released into the atmosphere. This oxygen is taken by animals and humans to breathe.

Complete answer:
Chloroplasts are green-colored plastids. Chloroplasts are present in the leaves and stem of plants. These green-colored plastids contain the green pigment chlorophyll. The green color of leaves is due to chlorophyll.
During the process of photosynthesis, green plants prepare their food. A green pigment, chlorophyll converts raw material into carbohydrates in the presence of solar energy. From the given options, Julius von Sachs proved that chlorophyll was present in special bodies named chloroplasts. He stated that the green part of the plants produces food in the form of glucose. Then extra glucose is stored in the form of starch.
Light is important in the process of photosynthesis because it provides energy for the conversion of raw materials into glucose. Therefore, photosynthesis is a photo-chemical reaction and involves light reaction and dark reaction.

Hence, the correct answer is option (A).

Additional information:
Cell organelles are the subunits of a cell that perform a specific function in the cell. There are two types of cells, and these are prokaryotic cells and eukaryotic cells. Cell organelles are found in both prokaryotic and eukaryotic cells. Cell organelles are embedded in the cytoplasm of cells. In eukaryotes, these organelles are enclosed in their own membrane.

Note: Plastids are present in plant cells and absent in animal cells. Green colored plastids are called chloroplasts. Chloroplasts contain a green pigment called chlorophyll, which is responsible for the green color of leaves. So, the chloroplast is a type of plastid.