Question

in the absence of muscle cells how do plants cell shows movements

Answer 1

Through the hormones which stimulates there movement I think

Answer 2

Hii dear.....!!!!

1.Tropic movements are growth movements in response to an environment stimulus. This type of movement may occur in reponse to gravity (gravitropism), light (phototropism), chemical (chemotropism), water (hydrotropism) etc.
2.Nastic movements are independent of the direction of stimulus. This type of movement may occur in response to chemicals (chemonasty), temperature (thermonasty), touch (thigmonasty) etc.
So we can conclude that plant cells do not possess muscle cells still they show movements in response to different stimuli.

hope it helps :)