Plants are not concious, sentient, emotional, self aware, or capable of sensation.
Conscious: a quality of the mind generally regarded to comprise qualities such as subjectivity, self-awareness, sentience, sapience, and the ability to perceive the relationship between oneself and one\'s environment.
Sentient: the capacity for basic consciousness ? the ability to feel or perceive, not necessarily including the faculty of self-awareness.
Self Aware: having or showing knowledge or understanding or realization or perception, aware of ones own existance; \"was aware of his opponent\'s hostility\"; \"became aware of her surroundings\"; \"aware that he had exceeded the speed limit\"
Emotional: the language of a person\'s mental state of being, normally based in or tied to the person\'s internal (physical) and external (social) sensory feeling. Love, hate, courage, fear, joy, sadness, pleasure and disgust can all be described in both psychological and physiological terms.
So... Consiousness, self awareness, and sentience are basically the same thing, or at least interdepenant on each other. They are also human only qualities as far as science can show so far. No animals besides humans are sentient.
As for emotional, emotion is something that animals have the capacity to posess. It is a more primative mental state, but humans are endowed with it as well. So are you saying that it is only cruel to eat animals that are complex enough to possibly have emotions?
As for react to stimuli, the notion that plants do not react to stimuli is pure rubbish. Suggesting otherwise really surprised me as I would assume someone of your intelligence (no trace of sarcasm - I certainly do consider you intelligent, otherwise I\'d not post back so often

) would be aware that not only do nearly all plants react to stimuli, but that reaction to stimulus is an essential part of plants.
Plant stimuls reactions are divided into two main categories, tropism, and Turgor Movements.
Tropism is a reaction to stimuls that changes the growth pattern of a plant. A common example would be phototropism, which causes plants to grow towards the best light source.
Turgor movements are the plants equivilant to muscle movement, and works similar to the starfishes water pressure based movement system. The changes in pressure allow plants to move very rapidly. A venus flytrap can close its jaws around an insect, certain plants close their flowers at night time, and sunflowers follow the suns path across the sky (hence the name). Also as I mentioned earlier plants can sense touch, - certain ferns shrink away and fold up when you touch them. THey also close up when damage has been done to help heal.