If the diploid number of a flowering plant is 36. What would be the chromosome number in its endosperm?

1. 36

2. 18

3. 54

4. 72

 

Endosperm is a product of triple fusion. One male nuclei (n=18) fuses with diploid secondary nucleus (2n = 36), so it becomes triploid structure (2n=54). So, ploidy of endosperm is (3n) and chromosomes will be 54.
Page 41, XI NCERT