We can solve this by converting both measurements to inches.
Orange tree:
1 foot=12 inches
7 feet=84 inches
84 inches + 9 inches = 93 inches total
Lemon tree:
1 yard=3 feet=36 inches
2 feet=24 inches
36 inches + 24 inches + 5 inches=65 inches total
Therefore, the orange tree is taller than the lemon tree.