Is daily homework necessar2

Is daily homework necessary? Many teachers assign homework to students everyday, and they seldom doubt it However, as far as I am concerned, it is not necessary To begin with, not every teacher has classes everyday For instance, a chemistry teacher may have no class on Monday It makes students learn nothing new about chemistry that day As a result, it becomes unnecessary for the chemistry teacher to assign homework Because if the teacher still assigns homework, perhaps the students will not have enough time to review what they have learned that day, such as physics and biology In addition, everyone must have his or her own leisure time Students are not machines They cannot work without any rest Even if a machine works everyday, its efficiency will become lower and lower and refuse to work finally So the teachers must let students have some spare time, when they can play games, have a picnic and other things they like It is good to children`s health Last but not least, assigning homework everyday is not a scientific way of studying Suppose you must physics homework everyday After several weeks, you will probably think physics is so boring that it no longer interests you How could one learn physics well under such circumstance? I think the only way to solve this problem is not to assign physics homework everyday So from what has been discussed, one can reach only this conclusion that daily homework is not necessary at all