What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells ?Steps.

Aleurone layer is the outermost cell layer of the endosperm. The ploidy of the endosperm is triploid. If the root cell which is diploid has 42 chromosomes, so the haploid cell would have 21 chromosomes and triploid would have 3 X 21=63 chromosomes.