III. HOAT DONG DAY HOC 1 Kiem tra
1. Quy trinh tao gidng mdi bdng phuong phap
mdi bdng phuong phap gay dot bien
Hoat ddng cda GV
+ Chidu xa len hat khd dinh sinh trudng.
+ Dung tia tfl ngoai budc sdng 2570 A" dd xfl If vi sinh vat, bao tfl va hat pha'n -> gay ddt bidn gen.
+ Sdc nhiet -> gay chdn thuang bd may di truyen - GV hoi:
+ Em CO nhan xet gi vd each sfl dung cdc tdc nhan gay dot bidn? + Ndu khdng sfl dung dflng cac tac nhan gay ddt bidn thi anh hudng nhu thd nao?
Hogt ddng cda HS Ndi dung
- HS thao luan nhdm.
+ Cd nhan nghien cflu cac thdng tin -> nhan bidt loai tac nhan va loai dd'i tflOng sinh vat. + Thao luan nhdm thd'ng nha't y kidn.
- Y6u cdu n6u dugc: + Sfl dung cac loai tac nhan nhfl tia tfl ngoai, tia
phdng xa, nhi6t di gay
ddt bidn.
+ Ddi tugng la vi sinh vat, ddng vat bac thdp, thuc vat.
Hogt dpng cda GV Hogt dpng cda HS Npi dung
- GV nhan xet, danh gia
va bd sung kien thflc. - GV ddn ddt: Mud'n gay dot bidn cd the sfl dung nhidu tdc nhan khdc nhau, tuy nhien cdn cd quy trinh chung. - GV y6u cdu HS. + Nghien cflu SGK trang 79 muc 1.
+ Trinh bay quy trinh tao gidng mdi bdng phuang phdp gay dot bidn nhan tao.
- GV hdi: Trong quy trinh tao gidng mdi bdng phuong phap gay dot bidn nhan tao can chu y
+ Sfl dung dung tac nhan va dung lidu lugng neu khdng se gay chdt cho sinh vat.
Dai dien HS trinh bay, ldp nhan xet bd sung.
- HS hoat ddng ddc lap. - Tdm tdt 3 khau trong quy trinh gay dot bidn.
- HS trao ddi nhdm de tra ldi.
- HS van dung kidn thflc ve ddt bidn.
Cac khau trong quy trinh tao gidng mdi bdng phflong phap gay ddt bidn nhan tao.
- Xfl If mdu vat bdng tac nhan nhan ddt bidn. - Chgn lgc cac the dot bidn cd kidu hinh mong mud'n.
Hogt dpng cda GV
khau nao dd dat hieu qua? Tai sao?
- GV nhan xet, danh gia va bd sung nhu hudng ddn SGV trang 84.
- GV neu van dd: Trong san xudt viec flng dung phuang phdp gay dot bidn dugc tidn hanh nhu the nao?
- GV nhan xet va bd sung kidn thflc.
Hogt dpng cda HS - Yeu cdu neu dugc:
+ Chu y khau xfl If mdu va chgn lgc.
+ Dot bidn khdng cd hudng, tac nhan gay dot bidn thi nhieu loai.
+ Loai dot bidn mong mud'n cd so lugng rat nhd nen chgn lgc khd khan.
- Dai dien nhdm trinh bay -> ldp nhan xet bd sung.
- HS trao ddi nhdm. + Van dung kidn thflc ve dot bidn.
+ van dung kidn thflc thuc tidn vd van dd san xudt thudc, vacxin, nang suat cay trdng.
Npi dung
2. iTng dung
* 0 vi sinh vat:
- Sinh san \'6 tfnh n6n
khdng tao dugc bien dj tdhgp.
- Sinh san nhanh -> dd nhan gidng, dd chgn lgc. - Xfl If bao tfl ndm bdng tia phdng xa rdi chgn lgc.
Hogt dpng cda GV
- GV neu y6u cdu: + Nghien cflu SGK trang 79.
+ Trinh bay cdc thanh tuu tao gidng d Viet Nam.
+ De xudt each thflc nhan bidt so bd cay tfl bdi trong sd cdc cay ludng bdi.
Hogt dpng cda HS Ndi dung
- HS nghien cflu SGK
trang 79.
- Xfl If thdng tin do GV cung cdp.
- van dung kidn thflc thuc tien.
* 6 thuc vat:
- Loai thuc vat khai thac
ca quan sinh dudng ->
gay dot bidn da bdi. - Loai thuc vat khai thac hat -> khdng gay ddt bidn da bdi vi san phdm bat thu.
* d dgng vat:
- DV bac thdp: gay ddt
bidn b rudi gidm.
- DV bac cao: khdng gay dot bidn vi co quan sinh san nam sau trong CO thd.