Polyoloidy are characterised by gigantism justify your answer.

Explanation

An organism having more than 2 sets of chromosomes is called polyploid. It can be induced by physical events such as heat or cold treatment, X-rays and chemical agents like colchicine. Polyploid cell or organism has three or more times the haploid chromosomal number.
Polyploid has a major role in the evolution of both wild and cultivated plants. Polyploid has a key role in plant breeding. There is increase and increased woodiness which has been observed in some insular plants. So polyploids are characterized by gigantism.