To solve this problem, we need to identify the mismatch among the given options related to plant characteristics. Let's analyze each option:$\newline •$Option 1: Cycas - Dioecious$\newline$ - Cycas is a genus of gymnosperms that is dioecious, meaning it has separate male and female plants.$\newline$ - Therefore, this statement is correct.$\newline •$Option 2: Salvinia - Heterosporous$\newline$ - Salvinia is a genus of aquatic ferns that are heterosporous, producing two types of spores: microspores and megaspores.$\newline$ - Therefore, this statement is correct.$\newline •$Option 3: Equisetum - Homosporous$\newline$ - Equisetum, commonly known as horsetail, is a genus of vascular plants that are homosporous, producing only one type of spore.$\newline$ - Therefore, this statement is correct.$\newline •$Option 4: Pinus - Dioecious$\newline$ - Pinus is a genus of gymnosperms that is monoecious, meaning both male and female cones are present on the same plant.$\newline$ - Therefore, this statement is incorrect.The mismatch is in Option 4, where Pinus is incorrectly described as dioecious.$\newline$Thus, the correct answer is Option 4.