Can soybeans be sole source for protein in vegetarian diet?

Vegetable protein: beans red or green or white,bean sprouts lentils, chickpeas and beans, bean, peas, rice, peanut butter, soy and tofu

Or quinoa and nuts.

Vegetables and fruits: There are many vegetables and fruits, which also contain proteins (such as guava, avocado, asparagus, broccoli or Venus, as well as broccoli, spinach and corn).