Yes, there are many science projects for young children. Like sowing the seeds and observing the growth of the plant and making notes in the notebook. To investigate the effect of temperature on various substances like water, candle etc.

Workbooks, practice papers which are based on MCQs and even NCERT books are very helpful for the kids.
For more details you can visit here => https://www.tiwariacademy.com/ncert-solutions/class-1/science/