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教科版三年級(jí)科學(xué)上冊(cè)教案
【教學(xué)目標(biāo)】
科學(xué)概念：
樹(shù)是活的植物，生長(zhǎng)在一定的環(huán)境里，是有生命的物體。
過(guò)程與方法：
初步認(rèn)識(shí)真正的觀察應(yīng)該是有目的的，制訂觀察的方法和步驟有利于觀察的進(jìn)行。
用各種感官觀察大樹(shù)。
借助放大鏡、皮尺等簡(jiǎn)單的工具對(duì)大樹(shù)進(jìn)行觀察和測(cè)量。
用簡(jiǎn)單的詞語(yǔ)記錄觀察的結(jié)果。
情感、態(tài)度、價(jià)值觀：
懂得從圖片上獲得的信息是有限的，親自觀察事物會(huì)對(duì)事物有更多的認(rèn)識(shí)。
發(fā)展觀察大樹(shù)的興趣，體會(huì)到生命體給我們帶來(lái)的生機(jī)勃勃的感受。
在觀察過(guò)程中，培養(yǎng)與他人合作的習(xí)慣。
【教學(xué)重點(diǎn)】
了解觀察的目標(biāo)和方法，認(rèn)識(shí)到觀察的重要性。
【教學(xué)難點(diǎn)】
對(duì)大樹(shù)的觀察要指向生命體這個(gè)核心概念。
【教學(xué)準(zhǔn)備】
分組材料：一些觀察用的測(cè)量工具（如皮尺、放大鏡等），觀察記錄紙。
【教學(xué)過(guò)程】
一、引言
1.校園里、大路旁、山坡上……到處我們都能看到植物，同學(xué)們對(duì)校園里的植物最熟悉的是哪些呢？
2.就讓我們從身邊的熟悉植物——大樹(shù)開(kāi)始觀察研究吧。
二、看照片上的大樹(shù)
1.教師講解：這是一幅梧桐樹(shù)的照片，請(qǐng)大家仔細(xì)地看圖，你能發(fā)現(xiàn)有關(guān)這株梧桐樹(shù)的哪些特點(diǎn)？ （你能發(fā)現(xiàn)幾點(diǎn)？）
2.學(xué)生匯報(bào)：從圖上看大樹(shù)，我看到了什么？（要求仔細(xì)傾聽(tīng)，并大膽說(shuō)出新的發(fā)現(xiàn)，同時(shí)區(qū)分哪些是真正從照片上獲得的信息。）
三、回憶中的大樹(shù)
1.教師引導(dǎo)：照片拍得很清楚，但是我們從照片上發(fā)現(xiàn)的東西并不多，那么生活中你曾經(jīng)看到過(guò)的大樹(shù)與這照片上的有什么不一樣嗎？
2.學(xué)生匯報(bào)：回憶我的大樹(shù)，我曾經(jīng)看到過(guò)什么？
3.教師激趣：同學(xué)們的匯報(bào)內(nèi)容真豐富，有的內(nèi)容大家都看見(jiàn)過(guò)，有的內(nèi)容有人還從來(lái)沒(méi)看見(jiàn)過(guò)，而有人可能從來(lái)都沒(méi)真正看過(guò)一棵大樹(shù)呢？是不是？想去仔仔細(xì)細(xì)地看一棵真正的大樹(shù)嗎？
4.學(xué)生交流：為什么想看真正的大樹(shù)？（再去看一看，是不是能看到更多的內(nèi)容！會(huì)不會(huì)也有樹(shù)瘤？是不是也有小動(dòng)物？是不是還有其它東西？）
5.教師總結(jié)：這樣帶著目的去仔仔細(xì)細(xì)看大樹(shù)的時(shí)候，我們的觀察活動(dòng)就開(kāi)始了。
6.學(xué)生小組交流并匯報(bào)：如果現(xiàn)在來(lái)到一棵大樹(shù)下，我想觀察什么？我們?cè)鯓硬拍苡^察到更多的內(nèi)容？
四、觀察真正的大樹(shù)
1.交流：教師引導(dǎo)孩子們交流在頭腦中制訂好的觀察大樹(shù)的個(gè)人計(jì)劃。（觀察內(nèi)容、觀察方法、需要借助的工具等）
2.活動(dòng)：現(xiàn)在讓我們一起去觀察一棵真正的大樹(shù)，我們肯定有更多的發(fā)現(xiàn)。同時(shí)把觀察到的信息，用簡(jiǎn)短的詞語(yǔ)記錄下來(lái)。（在保證安全的情況下老師帶學(xué)生按計(jì)劃開(kāi)展真正的實(shí)地觀察活動(dòng)。）
3.評(píng)價(jià)：回教室后每小組互相欣賞各自的觀察內(nèi)容，說(shuō)說(shuō)從不同的記載中如何體會(huì)到觀察的大樹(shù)是一個(gè)生命體。同時(shí)推選一位同學(xué)的記錄單張貼于科學(xué)活動(dòng)專欄內(nèi)供大家欣賞，其它同學(xué)的記錄單上交給老師閱讀欣賞。（張貼的記錄單要有典型特色。）
4.總結(jié)：觀察一棵樹(shù)讓我們獲得了這么多的信息，觀察一棵樹(shù)讓我們發(fā)現(xiàn)了一個(gè)生機(jī)勃勃的生命世界，那么，觀察更多的樹(shù)呢？請(qǐng)?jiān)谡n外繼續(xù)觀察不同的樹(shù)。
板書(shū)設(shè)計(jì)：略
教學(xué)后記：略
延伸閱讀（英語(yǔ)版）：
Scientific concept:
A tree is a living plant that grows in a certain environment and is a living object.
Process and methods:
A preliminary understanding of real observation should be purposeful, and the method and procedure of making observations is conducive to observation.
Look at the tree with all kinds of senses.
The tree is observed and measured with a simple tool like a magnifying glass and a ruler.
Record the observations with simple words.
Emotions, attitudes, values:
There is a limit to how much information can be obtained from pictures, and observing things in person will have more awareness of things.
Develop the interest of looking at the tree and experience the vitality that life brings to us.
Cultivate the habit of cooperating with others during observation.
[key points of teaching]
Understand the goals and methods of observation and recognize the importance of observation.
Teaching difficulties
Observation of big trees points to the central concept of life.
[teaching preparation]
Grouping material: some observation measuring tools (such as a ruler, magnifying glass, etc.), observe the recording paper.
[teaching process]
I. introduction
On campus, on the road, on the hillside... We can see plants all over the place. What are the most familiar to the plants on campus?
Let's start with the familiar plants around us.
Look at the tree in the photo
This is a picture of a plane tree. Please look at the picture carefully. What features can you find about the plane tree? What time can you find out?
Student report: looking at the tree, what do I see? (to listen carefully and speak out for new discoveries, and to distinguish what is really from the photo.)
The tree in memory
1. Teacher guidance: the picture is very clear, but we don't find much in the picture, so what is the difference between the big tree you have seen in life and the one in this picture?
Student report: remember my big tree, what have I seen?
Addition, (3) teachers: students report content is rich, everyone has seen some content, some people have never seen, and some may never really seen a tree? Isn't it? Want to see a real big tree carefully?
Student communication: why do you want to see real trees? See if you can see more! Is there a tree tumor? Do you have small animals? Is there anything else?
5. The teacher concludes that our observation begins when we look at the big trees with purpose.
If you come to a big tree now, what do I want to observe? How can we observe more?
Look at the real tree
1. Communication: teachers guide the children to communicate in their minds with a personal plan to observe big trees. (observation of content, observation methods, tools to be used, etc.)
2. Activities: now let's go and observe a real tree, and we must find more. Keep an eye on the information and record it in short words. (in the case of safety, the teacher takes the students to carry out real field observation as planned.)
3. Evaluation: after returning to the classroom, each group will appreciate their observations, and tell us how to realize that the tree is a living thing from different records. At the same time, I will select a student's record list to be posted in the scientific activity column for you to enjoy, and the other students' records will be submitted to the teacher for reading and appreciation. (the list of records should be typical.)
To sum up: to observe a tree that gives us so much information, to observe a tree and let us discover a living world, so to observe more trees? Please continue to observe different trees after class.
Board design: slightly
Teaching post: slightly
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