  We present the results from our time-series imaging data taken with the 1.3m
Devasthal fast optical telescope and 0.81m Tenagara telescope in $V$, $R_{c}$,
$I_{c}$ bands covering an area of $\sim18^\prime.4\times 18^\prime.4$ towards
the star-forming region Sh 2-190. This photometric data helped us to explore
the nature of the variability of pre-main sequence (PMS) stars. We have
identified 85 PMS variables, i.e., 37 Class II and 48 Class III sources.
Forty-five of the PMS variables are showing periodicity in their light curves.
We show that the stars with thicker discs and envelopes rotate slower and
exhibit larger photometric variations compared to their disc-less counterparts.
This result suggests that rotation of the PMS stars is regulated by the
presence of circumstellar discs. We also found that the period of the stars
show a decreasing trend with increasing mass in the range of $\sim$0.5-2.5
M$_\odot$. Our result indicates that most of the variability in Class II
sources is ascribed to the presence of thick disc, while the presence of cool
spots on the stellar surface causes the brightness variation in Class III
sources. X-ray activities in the PMS stars were found to be at the saturation
level reported for the main sequence (MS) stars. The younger counterparts of
the PMS variables are showing less X-ray activity hinting towards a less
significant role of a stellar disc in X-ray generation.
