Step 1: Identify the Japanese art forms.
Ikebana: The Japanese art of flower arrangement.
Bonsai: The art of growing miniature trees in containers.
Ongami: Not related to Japanese art of flower arrangement.
Moribana: A style of Ikebana, but the general term for the art form is Ikebana.
Step 2: Hence, the correct answer is (1) Ikebana, the general term for Japanese flower arrangement.