To solve this problem, we need to identify which character was not considered by Mendel in his experiments on pea plants. Let's analyze each option:$\newline \bullet$Option 1: Trichomes-glandular or non-glandular.$\newline$ - Mendel did not study trichomes (hair-like structures) in his experiments.$\newline$ - This character was not part of Mendel's seven traits.$\newline \bullet$Option 2: Seed-green or yellow.$\newline$ - Mendel studied seed color, specifically green and yellow seeds, as one of his seven traits.$\newline \bullet$Option 3: Pod-inflated or constricted.$\newline$ - Mendel studied pod shape, including inflated and constricted pods, as one of his seven traits.$\newline \bullet$Option 4: Stem-tall or dwarf.$\newline$ - Mendel studied plant height, specifically tall and dwarf stems, as one of his seven traits.$\newline$Therefore, the character that was not considered by Mendel in his experiments is:$\newline$Option 1: Trichomes-glandular or non-glandular.