Q.Borassus flabellifer is the binomial of :

Stevioside from Stevia rebaudiana is correctly matched as a natural sweetener; the other three pairs contain factual errors.

Working

Each pairing is checked in turn:

1. Stevioside ('Steveocide' in the question is a misprint of Stevioside) is the principal sweet-tasting steviol glycoside isolated from the leaves of Stevia rebaudiana, an economically important plant grown as a natural, non-caloric sugar substitute for diabetics and health-conscious consumers -- this is a well-established, accurate fact taught under natural sweetener plants.
2. Palmyra (Borassus flabellifer, the state tree of Tamil Nadu) is native to tropical Africa and the Indian subcontinent (India, Sri Lanka and neighbouring regions), not to Brazil -- this pairing is factually wrong. …

Borassus flabellifer = palmyra palm.

Borassus flabellifer, the palmyra palm (panai maram in Tamil), is an economically important Arecaceae tree in Tamil Nadu, yielding sweet sap (toddy/neera), palm sugar (jaggery), edible fruit pulp and immature endosperm (nungu/ice apple), leaves used for thatching and traditional palm-leaf manuscr …