Which one of the following is a total parasite

Explanation:

• Nepenthes (tropical pitcher plant) is an insectivorous plant that feeds on bugs.
• Rhizobium is an aerobic nitrogen-fixing bacteria.
• Cuscuta is a total stem parasite.
• Cuscuta lacks chlorophyll and is dependent totally on the host plant as it extracts water and nutrients from the host plant.
• Lichens are plants with symbiotic relationships between algae and fungi.

Final Answer:

Hence, the correct option is C: i.e. Cuscuta.