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Chloroplasts are primarily responsible for capturing light energy and producing sugars in plant cells.

Chloroplasts play a crucial role in photosynthesis, where they capture light energy and convert it into chemical energy in the form of sugars. This process is vital for plant growth and energy storage.

A) Mitochondrion

Mitochondria are the powerhouses of the cell, responsible for producing ATP through cellular respiration. They do not capture light energy or produce sugars; instead, they utilize the sugars produced by chloroplasts for energy.

B) Ribosome

Ribosomes are the cellular structures responsible for protein synthesis. They do not have any role in capturing light energy or producing sugars, as their function is limited to translating mRNA into proteins.

C) Nucleus

The nucleus contains the cell's genetic material and regulates gene expression, but it is not involved in energy capture or sugar production. Chloroplasts carry out these functions independently of the nucleus.

D) Chloroplast

Chloroplasts are specialized organelles in plant cells that capture light energy through chlorophyll and convert it into chemical energy via photosynthesis, leading to the production of sugars essential for the plant’s growth and energy needs.

Conclusion

Chloroplasts are definitively the correct answer, as they are the only organelles specifically designed for photosynthesis in plant cells, directly capturing light energy and transforming it into sugars. All other options—mitochondria, ribosomes, and the nucleus—serve different cellular functions and do not participate in the process of capturing light energy or producing sugars.