The endosperm of an organism has chromosome 30. So the chromosome in root cell is

Answer: Option B

The endosperm of an organism has chromosome 30. So the chromosome in the root cell is 20.
The endosperm is triploid, i.e. 3n.
3n = 30
Therefore n = $$\frac{30}{3}=10.$$
Each cell of the root is diploid that will be 2n, that will be 2 × 10= 20