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Bai%2045%20%20 nguon%20goc%20cay%20trong[1]
1.
12/27/2012
BAØI 45 : NGUOÀN GOÁC CAÂY TROÀNG 1.Caây troàng baét nguoàn töø ñaâu ? 2.Caây troàng khaùc caây daïi nhö theá naøo ? 3.Muoán caûi taïo caây troàng caàn phaûi laøm gì ? BAØI 45 : NGUOÀN GOÁC CAÂY TROÀNG 1. Caây troàng baét nguoàn töø ñaâu ? Haõy keå teân moät vaøi caây troàng vaø coâng duïng cuûa chuùng ? _Caây troàng baét nguoàn töø caây daïi,tuøy vaøo muïc ñích söû duïng maø VD : Hoa hoàng duøng laøm caûnh, con ngöôøi taïo ra nhieàu gioáng caây nöôùc hoa; böôûi duøng laøm thöùc aên, troàng khaùc nhau . cheá tinh daàu… Cho bieát caây ñöôïc troàng vôùi muïc ñích gì ? Ñeå phuïc vuï cho ñôøi soáng con ngöôøi Vaäy caây troàng baét nguoàn töø ñaâu ? Caây troàng baét nguoàn töø caây daïi 1
2.
12/27/2012 2. Caây troàng
khaùc caây daïi nhö theá naøo ? Nhìn H45.1.1,thaûo luaän nhoùm 5 phuùt traû lôøi caùc caâu hoûi sau : 1./Haõy neâu teân caùc caây caûi troàng vaø cho bieát boä phaän naøo cuûa chuùng ñöôïc söû duïng ? 2./Em haõy cho bieát söï khaùc nhau giöõa caùc boä phaän töông öùng thaân , laù, hoa cuûa caûi daïi vaø caûi troàng ? ÑAÙP AÙN Caâu 1 : 2./ Suplô - boä phaän söû duïng : hoa 3./ Baép caûi – boä phaän söû duïng : laù 4./ Su haøo – boä phaän söû duïng : thaân Caâu 2 : Tuøy vaøo boä phaän maø con ngöôøi söû duïng : Thaân , laù ,hoa cuûa caûi troàng to hôn , ngon hôn caûi daïi … 2
3.
12/27/2012 Nhận biết
cây trồng và cây dại Chuoái daïi Chuoái troàng Teân caây Boä phaän So saùnh tính chaát duøng Caây hoang daïi Caây troàng Chuoái Quaû Quaû nhoû,chaùt,nhieàu haït Quaû to ,ngoït , khoâng haït HOÀNG DAÏI HOÀNG TROÀNG Teân caây Boä phaän So saùnh tính chaát duøng Caây hoang daïi Caây troàng Hoa hoàng Hoa Nhoû , ít maøu saéc To , maøu saéc saëc sôõ 3
4.
12/27/2012
Luùa daïi Luùa troàng Teân caây Boä phaän So saùnh tính chaát duøng Caây hoang daïi Caây troàng Boâng luùa ít , Boâng luùa to,haït Luùa Boâng haït leùp nhieàu chaéc khoûe Haõy giaûi thích vì sao giöõa caây troàng vaø caây daïi laïi coù nhöõng khaùc bieät ñoù ? _Do nhu caàu söû duïng caùc boä phaän khaùc nhau->con ngöôøi ñaõ taùc ñoäng caûi taïo caùc boä phaän ñoù ->laøm cho caây troàng khaùc xa caây daïi . Haõy cho bieát caây troàng khaùc caây daïi ôû ñieåm naøo ? +Caây troàng khaùc caây daïi ôû boä phaän maø con ngöôøi söû duïng. + Boä phaän ñöôïc con ngöôøi söû duïng coù phaåm chaát toát . 4
5.
12/27/2012
BAØI 43 : NGUOÀN GOÁC CAÂY TROÀNG 1. Caây troàng baét nguoàn töø ñaâu ? _Caây troàng baét nguoàn töø caây daïi,tuøy vaøo muïc ñích söû duïng maø con ngöôøi taïo ra nhieàu gioáng caây troàng khaùc nhau . 2. Caây troàng khaùc caây daïi nhö theá naøo ? _Caây troàng khaùc caây daïi ôû boä phaän con ngöôøi söû duïng : + Caây troàng coù nhieàu loaïi phong phuù + Boä phaän ñöôïc con ngöôøi söû duïng coù phaåm chaát toát . BAØI 43 : NGUOÀN GOÁC CAÂY TROÀNG 1. Caây troàng baét nguoàn töø ñaâu ? 3. Muoán caûi taïo caây troàng caàn phaûi laøm gì ? _Caây troàng baét nguoàn töø caây daïi,tuøy vaøo muïc ñích söû duïng maø con ngöôøi taïo ra nhieàu gioáng caây _Caûi bieán tính di truyeàn :choïn troàng khaùc nhau . gioáng ,lai , chieát , gheùp ,gaây ñoät bieán… 2. Caây troàng khaùc caây daïi nhö theá naøo ? _Chaêm soùc caây : töôùi nöôùc,boùn phaân,phoøng tröø saâu beänh … _Caây troàng khaùc caây daïi ôû boä phaän con ngöôøi söû duïng : + Caây troàng coù nhieàu loaïi phong phuù + Boä phaän ñöôïc con ngöôøi söû duïng coù phaåm chaát toát . 5
6.
12/27/2012 Ghi nhôù : _Caây
troàng baét nguoàn töø caây daïi.Tuøy theo muïc ñích söû duïng maø töø moät loaøi caây daïi ban ñaàu con ngöôøi ñaõ taïo ra ñöôïc nhieàu thöù caây troàng khaùc xa vaø toát hôn haún toå tieân hoang daïi cuûa chuùng. _Nhôø khaû naêng caûi taïo thöïc vaät cuûa con ngöôøi,ngaøy nay ñaõ coù raát nhieàu thöù caây troàng khaùc nhau. 6