Final answer:
Polyploid plants are fertile with an even number of chromosome sets because it allows for proper meiosis and gamete formation. Odd-numbered sets result in sterility due to improper pairing and chromosome segregation during meiosis. The correct option is c) Odd sets result in chromosomal abnormalities
Step-by-step explanation:
Polyploid plants with an even number of chromosome sets are usually fertile because they promote proper meiosis. Each chromosome from one set can pair with its corresponding chromosome from the other set during meiosis, allowing for normal segregation and formation of gametes.
On the other hand, polyploid plants with an odd number of chromosome sets are usually sterile. This sterility is the result of an inability to pair all chromosomes during meiosis, which leads to the production of aneuploid gametes that are not viable.
While even sets may enhance genetic diversity, the main reason for fertility in even-numbered polyploids is the ability to undergo normal meiotic processes. The correct option is c) Odd sets result in chromosomal abnormalities