A book report is basically discussing the book contents in the form of a formal essay.
It sums up the significant features of the book like characters, title, author and plot and represents what a student like you understood or read about that particular book.
Remember! Writing a book report is different from writing a book review that demands a writer to give his/her personal opinions regarding the book. A lot of students consider these two different things the same which is utterly wrong.
A lab report is basically an analysis of a scientific process.
How did you carry out the procedure?
What methods were used in it?
What was the hypothesis?
What was the evidence to support your hypothesis?
How did you formulate the results?
What is the analysis of your experiment according to the hypothesis?
Hence, everything done during an experiment is discussed in your lab report. Lab reports are important when it comes to lab courses and they also contribute significantly to your final grades.
Sometimes you teachers help you by giving an outline for your lab report. When you enter high school, you have to do everything on your own.