Question

If the root cells of an angiosperm have 38 chromosomes, then the number of chromosomes in the primary endosperm nucleus of this plant will be ______.

Options

• 57

• 38

• 19

• 76

Answer 1

If the root cells of an angiosperm have 38 chromosomes, then the number of chromosomes in the primary endosperm nucleus of this plant will be 57.

Explanation:

In angiosperms, the root cells (somatic cells) are diploid (2n); here, 38 chromosomes means 2n = 38. The primary endosperm nucleus is formed by the fusion of one male gamete (n = 19) with two polar nuclei (each n = 19), resulting in a triploid (3n) nucleus. Thus, the number of chromosomes in the primary endosperm nucleus will be 3 × 19 = 57.