How does the infection affecting plants from Tobacco Mosaic Virus (TMV) impact their growth?

The impact of Tobacco Mosaic Virus (TMV) on plants is significant, particularly in how it restricts photosynthesis. TMV infects plant cells, leading to damage in the plant's ability to carry out photosynthesis effectively. This virus attacks the chloroplasts—the structures responsible for photosynthesis—resulting in the discoloration of leaves and a reduction in chlorophyll content. As photosynthesis is crucial for producing the energy and organic compounds that plants need for growth, any restriction in this process can severely limit the plant's overall growth and vitality. Consequently, the consequences of TMV infection can include stunted growth, reduced yield, and overall health decline in the plant. Therefore, recognizing that the virus undermines a fundamental process like photosynthesis clarifies why this answer is correct.