This is not possible. The captcha function in Limesurvey is the very first thing, because it is there to avoid that bots enter the survey and fill it randomly.
Help us to help you!
Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
Always provide a LSS file (not LSQ or LSG).
Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.
Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
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