三年级学生观察日记

小编: admin

数菜籽

11月9日 晴

今天科学课,李老师走进教室就问了我们两个问题:

“你们猜一猜,每棵油菜上大约有多少个菜荚?每个菜荚里有多少颗菜籽?”

老师的话刚说完,大家就七嘴八舌地回答起来:“21个菜荚,20颗菜籽。”

“50个菜荚,16颗菜籽。”

“100多个菜荚,30几颗菜籽。”……

李老师神秘地笑了笑,说:“我们还是到田里去解决这个问题吧!”

我们来到田边,一看,二十多天前,这里还是一片金黄,现在每一棵油菜的枝条上结满了一个个饱满的菜荚了,看起来有点沉。仔细观察菜荚,只见一颗颗种子胀满了它的“外衣”,圆鼓鼓的凸了出来,顶端尖尖的;剥去“外衣”――菜荚,里面的种子圆溜溜的,像一颗颗小珍珠晶莹发亮,十分好看。

我和仇琦两人一组合作数,我们两个两个地数,很快就数完了三株油菜。当我数到最后一棵的时候,大吃一惊,这株足足有400多个菜荚,它们密密麻麻地挂在茎上伸出的枝条上。我还从上面采来了一个菜荚,剥开数了数有27颗菜籽。

??刘 召

Today, science classes, the teacher asked us to walk into a classroom on two issues : "You guess.Rape about the number of dishes for each pod? how many there are in each pod vegetables rapeseed? "the teacher said just now.We will go on to answer : "21 dishes dioxin, 20 were rapeseed. "" Vanilla 50 dishes.Rapeseed 16 satellites. "" Vanilla more than 100 dishes, a few of rapeseed 30. ": : The teacher smiled mysteriously and said :"We have to solve this problem or to the fields!" We have come to the edge, a look at two days ago,here was still golden, every tree branches rape of a month full of dishes full unity of the pod looks a bit Shen.Careful observation pod vegetables, I saw so many seeds of its legs "while" a convex circular swelling, and the sharp tip;Has the "cloak" of dioxin -- vegetables, seeds inside the circle Liuliu, like so many small shiny glistening pearls, very pretty.Theirs was a combination of me and a few Qiuqi, two at several quickly finished several lengthy rape.When I find that the tree came over 400 pages of this strain of dioxin in food,They're helping to hang on branches stems.I have to adopt a vegetable dioxin from above, catching 27 rapeseed augmented.