As a sidepoint, I'm going to have to argue that while a soul can be considered a rational concept, it is by know means scientific. I have not aware of any peer reviewed research utilizing the scientific method to show that a soul exists.

But to get to your main point, my question again is why are plants excluded from this state? I really don't get it. You call out that animals are different because they aren't inanimate beings, but neither are plants. Plants are complex, highly evolved multi cellular organisms that are certainly not inanimate.

If the argument is that animals are a life form that are closer form of life to humans so that's why you shouldn't eat them, I can buy that argument. It's a similar moral argument for why you shouldn't eat humans.

But that's a lot different from claiming that animals have souls/spirit/animus and plants don't. From any biological perspective plants are just as alive as animals. Plants communicate, respond to touch, many even actively kill other organisms (venus fly traps, bird catcher trees, etc.), they've been experimentally verified to exhibit some type of memory, and they respond to all sorts of stimuli (for example, turning towards the sun). Rationally, isn't that pretty darn alive? It seems shortsighted to think that plants lack a spirit/soul.