The immediate effect of pollen on the character of endosperm is called

Solution (By Examveda Team)

The immediate effect of pollen on the character of endosperm is called Xenia.
Xenia in plants is the effect of pollen on the seeds and fruit of the fertilized plant. The effect is separate from the contribution of the pollen toward the next generation.
The term was coined in 1881 by the botanist Wilhelm Olbers Focke to refer to effects on maternal tissues, including the seed coat and pericarp, but at that time endosperm was also thought to be a maternal tissue, and the term became closely associated with endosperm effects.