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巧设生物课引言悬念之初探
发布时间:2021-06-14 20:04访问

  谢裕

  (新疆维吾尔自治区塔城裕民县第二中学)

  俗话说:“良好的开端是成功的一半。“”万事开头难。“所以两端课的开场白占的时间比例虽小,但不可忽视。它能使学生很快进入学习状态,激发学生的求知欲,引起学生的无意注意乃至学习兴趣,激发学生的学习动机,获得更好的学习效果。教师如能用科学的态度,简练的语言,自然的约会,丰富的情感在引言中对本节课的中心内容精心设置恰如其分的悬念,可以通过节节课的成功打开大门。

  如何根据生物学的特点在片段课的引言中设置悬念呢呢?这是一种艺术,需要经过周密的思考,认真的准备,详尽的调查,才能达到炉火纯青的地步。

  一,紧扣授课内容,注意自然性

  悬念针对学生很快地对教师的讲课产生注意,使学生的思想从下课休息活动时产生的兴奋回复到课堂中来,但是如果悬念与授课的主题联系不紧,即使教师强行转入,授课的主题也终因结果与悬念关系不大而使学生的注意消失,甚至对授课反感。因此要紧扣授课主题,从悬念自然转入主题。E.G,在讲“植物生命活动调节”时,我设置:“你看见过农民播种吗?他们播种时,并没有考虑种子的落土方向,但植物种子萌发的时候,根总是深入地下,茎总是破土朝上生长,你知道是什么原因吗?“这样的悬念,既紧扣授课内容,而且过渡自然。

  二、紧扣已有的知识基础,Pay attention to novelty

  Suspense as a novel stimulus attracts people's attention,Depends on how well people understand it.If people don't understand something novel,Although it may attract attention for a while,But it quickly loses its effect,Can't attract people for a long time.On the contrary, when people have some understanding of a novelty but not complete it,In order to gain further understanding,Will attract strong attention,And maintain this attention for a long time.例Such as,When learning "sex determination and sex-linked inheritance",You can ask students first: "What are the characteristics of the individual development of multicellular organisms?""The student replied: "The fertilized egg."The teacher will ask again: "Why do some fertilized eggs develop into females,Some develop into males?Why is the inheritance of some traits always associated with gender?"Therefore, a situation of "cannot stop" is formed,at this time,The teacher immediately said,To answer these questions,We have to learn "Gender Determination and Sex-related Inheritance".This situation of creating problems,Greatly stimulated students' curiosity and sense of need for the content of this section,It creates favorable conditions for the next successful study.

  3. Keep up with students' interests,Attention Tendency

  Einstein said: "Interest is the best teacher."No student dislikes guessing riddles and listening to stories.If the teacher passes these vivid opening remarks,Set up a suspicion,Can create an interesting thinking mood,So as to stimulate students' strong curiosity,It will undoubtedly make teaching more effective.Such as,When talking about the "law of free combination of genes",Let me tell the students a story: There is a beautiful lady in America,Refused the courtship of many suave sons,But fell in love with Einstein,And said: "If you and I get married,The offspring born must be as smart as you,As beautiful as me."Just ask,What will happen to their offspring?The students are very interested,I want to get the answer to this question as soon as possible,The determination to "break the casserole and ask to the end" was born,Attracted the students' unintentional attention,Draw the attention of the students to the teacher,The student's thirst for knowledge abounds.

  Four, closely follow the characteristics of the times,Mindfulness

  Biology must develop social productivity,Gradually improve people's material life and cultural life level services.如,Use the laws of biology to suppress harmful organisms,Develop and protect beneficial animals,For the benefit of mankind,So when we set up suspense,You should be careful not to simply cater to students' interests.To do things that shouldn't be promoted,It should help cultivate students' noble sentiments,Establish lofty ideals,Form a highly professional and hard-working spirit,Unify teaching and educating people organically.

  not difficult to see,Set up suspense in the teaching introduction,Not only must have a solid professional foundation,At the same time, there must be extensive knowledge,A wide range of hobbies,Master the psychological status of students,Otherwise, it will be more difficult to achieve the desired effect in just a few minutes.and so,We must always pay attention to collecting various data,Investigate students' hobbies, learning motivation, etc.According to these, the content of each lesson is matched with multiple corresponding suspense to compare,Choose those that are most understandable and interesting for students,Can best transform learning motivation,With novelty,Natural transition,The suspense in the introduction of moderate length,It will definitely produce a better teaching effect,Successfully completed the teaching task of the lesson learned.

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