Plants do not have any nervous system(give reason)
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Plants don't have central nervous
systems for the same reason fungi, microbes, and sea sponges don't: they
didn't evolve in those groups, and didn't need to. Plants don't need
brains any more than humans need leaves, and it wouldn't help them.
Simple nervous systems evolved in the animals around the time of the jellyfish, which have simple nerve nets but no brains. Later animals developed ganglia, or groups of nerve cells that helped direct signal flow, and these eventually became brains. The process was slow and took millions of years, but most animals since have brains.
Brains are so important for humans that we have trouble thinking that other organisms don't have them, but they do. They've been around longer than we have, and are doing better than we are too.
Plants don't really need nervous systems. They can "communicate" within their body via changes in water pressure and certain compounds like hormones, and can "communicate" with other plants in a limited way with chemicals too. Many animals do the same. Human bodies also use hormones for inter-cellular communication, in addition to nerves. We have the same "endocrine" systems plants use (albeit with different chemicals), we just have the extra, faster nervous system as well. Also, as Joe said, plants don't move much (no muscles) or process sensory information, so they don't need nerves for that either.
Simple nervous systems evolved in the animals around the time of the jellyfish, which have simple nerve nets but no brains. Later animals developed ganglia, or groups of nerve cells that helped direct signal flow, and these eventually became brains. The process was slow and took millions of years, but most animals since have brains.
Brains are so important for humans that we have trouble thinking that other organisms don't have them, but they do. They've been around longer than we have, and are doing better than we are too.
Plants don't really need nervous systems. They can "communicate" within their body via changes in water pressure and certain compounds like hormones, and can "communicate" with other plants in a limited way with chemicals too. Many animals do the same. Human bodies also use hormones for inter-cellular communication, in addition to nerves. We have the same "endocrine" systems plants use (albeit with different chemicals), we just have the extra, faster nervous system as well. Also, as Joe said, plants don't move much (no muscles) or process sensory information, so they don't need nerves for that either.
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