kernel processes - are they really needed?

[Ram]

Hi,
    When i do ps -l. i see the following processes which are obviously
started by kernel.

   Could any one tell me what each of these processes do and can
anyone of them can be removed.?

PID  Uid     VmSize Stat Command
    1 root        584 S   init
    2 root            SWN [ksoftirqd/0]
    3 root            SW  [watchdog/0]
    4 root            SW< [events/0]
    5 root            SW< [khelper]
    6 root            SW< [kthread]
   23 root            SW< [kblockd/0]
   38 root            SW  [pdflush]
   39 root            SW  [pdflush]
   40 root            SW< [kswapd0]
   41 root            SW< [aio/0]
   85 root            SW  [mtdblockd]
  116 root            SWN [jffs2_gcd_mtd9]
Regards,
ram
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