rheotaxis meaning in Hindi

Examples

1. It has been shown that adult females cannot locate the host at a distance via rheotaxis or chemotaxis.
2. In fish that exhibit rheotaxis, it can easily be demonstrated by creating an artificial current within a tank using pumps.
3. Some resemble small fish themselves, with eye spots, a'tail'and horizontal stripes, and may even move in a similar fashion, as if facing the current ( rheotaxis ).
4. However, careful experimental examinations of all these possibilities with proper controls demonstrated that the measured responses to temperature are true thermotactic responses and that they are not a reflection of any other temperature-sensitive process, including rheotaxis and chemotaxis.
5. This belief was taken apart when it became clear that only few of the ejaculated spermatozoa  in humans, only ~ 1 of every million spermatozoa  succeed in entering the oviducts ( Fallopian tubes ) and when more recent studies showed that mammalian spermatozoa employ at least three different mechanisms, each of which can potentially serve as a guidance mechanism : chemotaxis, thermotaxis and rheotaxis.