Final answer:
The correct answer is option 1. Rafflesia is the correct example of a total stem parasite, as per the given question. It is a holoparasite that depends entirely on its host for nutrients since it lacks chlorophyll and cannot photosynthesize.
Step-by-step explanation:
An example of a total stem parasite is Rafflesia. Total stem parasites or holoparasites, like Rafflesia, are completely dependent on their host plants for survival.
These parasites have reduced or no chlorophyll, hence cannot perform photosynthesis and must derive all their nutrients directly from their hosts. This contrasts with hemiparasites, which retain some photosynthetic capability. Among the options provided, Rafflesia fits the definition of a total stem parasite as it lacks chlorophyll and completely relies on its host.
Therefore, the correct option for the example of a total stem parasite is (1) Rafflesia.