Which organism is a simple parasitic plant that lacks chlorophyll and reproduces by spores?

The correct answer is a fungus. Fungi are classified as simple parasitic organisms that do not contain chlorophyll, which is essential for photosynthesis. Instead of producing their own food through this process, fungi obtain nutrients from their host organisms, often leading to their parasitic nature.

Furthermore, fungi reproduce through spores, which are microscopic cells that can develop into new organisms under suitable environmental conditions. This reproductive strategy allows fungi to spread and colonize new areas, contributing to their role in ecological systems.

In contrast, the other options do not fit the definition of a simple parasitic plant lacking chlorophyll. Bacteria are prokaryotic microorganisms that can be autotrophic or heterotrophic but are not classified as plants. Viruses are not considered living organisms and cannot reproduce independently but require a host to replicate. Algae, while they may vary in complexity, are photosynthetic organisms that do contain chlorophyll and are therefore capable of producing their own food.