Animals are more intelligent than plants because animals have brains. If you're willing to contest the assumption that intelligence lies in brains, I don't myself have anything to convince you otherwise, but I'd like to point out that personally, I think it's rational to trust the overwhelming scientific majority on this issue.
Wikipedia says:
Sentience is the ability to feel or percieve.
Again, I believe that thoughts lie in the brain, which plants don't have. Throughout history, I also don't believe there's been any indication that any plant has an organ capable of generating thoughts and consciousness the way a brain can.
I should revise what I said to mean that certain animals have what I think is a clear will to live. Intelligent animals such as dogs, cats, and primates are fearful of bodily harm- nearly everything an animal does is to avoid harm, and I just don't think that we have the right to harm them.
What did I just explain which was not already self-evident?
Thank you for clarifying your points. Of course I already suspected what you meant but you could have meant several things, and by getting you to clear it up it makes it easier for me to prove you wrong/throw some doubt onto your views.
Let us tackle this one point at a time:
You say there is overwhelming scientific evidence that intelligence lies in the brain. Sure I won't deny that, but is there any evidence that intelligence
cannot lie in some other substance? Also, I am quite openly prepared to debate right here that animals do not possess any intelligence in the way that humans do, and certainly not to an extent that they are more "worthy" than plants. Have you ever see a kitten take a dump on kitchen tiles (or some other hard surface), and then try to cover it by clawing at the tiles? This is a natural instinct of the kitten, and I have to admit it does not strike me as particularly intelligent.
You define sentience from wikipedia, which I am happy to accept. Now why is it that plants cannot feel and perceive? Shelley already provided a little defense for this view. Plants appear to react to their environments so they must be feeling and perceiving something there.
You talk about consciousness, but let's be honest this is something that is going to depend entirely on how you define conscious, which still generates huge philosophical debates and we are not about to solve this problem. What it comes down to is, again there is no reason to assume that "consciousness" can
not exist in some other substance. (Actually I do not believe that plants, nor animals, are "conscious" in any robust sense as humans are).
I agree that animals have a will to avoid pain etc. But what about plants? What is poison ivy, if not a defense mechanism to protect the plant, perhaps from pain.
Turning this into an animal rights thread is just killing the topic in my opinion.
Boo you. Don't be a kill joy this debate is way more fun than anything about that video.
EDIT: I want to add something about the "plants don't have central nervous systems therefore can't feel" claims that have been thrown around. Does this not strike people as a blatantly ignorant view, like "we don't know better therefore it can't be true"? Let's be honest, we have no reason to assume that "feelings" cannot come from something other than a CNS.