Pollination achieved within the same flower is known as:

The correct answer is Option (1) → Autogamy

Option (1) Autogamy — Correct. In autogamy the pollen and the stigma belong to one flower. Geitonogamy uses another flower of the same plant and xenogamy a flower of a different plant; heterogamy is not a type of pollination in NCERT.

NCERT Extract:
Pollination – “… Autogamy : In this type, pollination is achieved within the same flower. Transfer of pollen grains from the anther to the stigma of the same flower (Figure 1.9a). In a normal flower which opens and exposes the anthers and the stigma, complete autogamy is rather rare.”