If there are 14 chromosomes in pea plant cells, how many chromosomes are present in a sex cell of a pea plant?

Seven. There are half as many chromosomes in the sex cells, or gamete cells, of an organism as there are in the normal, or somatic cells, of that organism.

There would be 7 - this would be the process of meiosis, which would result in 4 haploid cells (each would have half the number of chromosomes as the parent (or 7), as meiosis is sex cell division) the other type of cell division is called mitosis and results in two daughter cells identical to the parent cell (2 cells, each with 14 chromosomes)