To solve this problem, we need to identify which technique is a method of micropropagation. Let's analyze each option:$\newline \bullet$Option 1: Somatic hybridization$\newline$ - Somatic hybridization involves the fusion of protoplasts from different plant species or varieties to create a hybrid.$\newline$ - This is not a technique of micropropagation.$\newline \bullet$Option 2: Somatic embryogenesis$\newline$ - Somatic embryogenesis is a process where a plant or embryo is developed from somatic or non-reproductive cells.$\newline$ - It is a key technique in micropropagation, allowing for the mass production of plants.$\newline$ - This is indeed a technique of micropropagation.$\newline \bullet$Option 3: Protoplast fusion$\newline$ - Protoplast fusion is a method used to combine genetic material from different plant cells by fusing their protoplasts.$\newline$ - This is not a technique of micropropagation.$\newline \bullet$Option 4: Embryo rescue$\newline$ - Embryo rescue is a technique used to save embryos from hybrid crosses that might not survive naturally.$\newline$ - This is not a technique of micropropagation.$\newline$Based on the analysis, the correct option is Option 2: Somatic embryogenesis, which is a technique of micropropagation.