- GV neu cau hdi thao luan:
+ O ddng vat ed he than kinh dang ludi va he than kinh dang chudi bach cac tap tinh ciia chiing hau hei la tap tinh bam sinh vi sao?
+ Tai sao ngudi va ddng vat cd he than kinh phat trien ed rat nhidu tap tinh hoc duoc?
- GV neu vi du: Chim non mdi nd chua md mat nhung ha md khi thay chim me di kie'm an ve. - GV hdi: Mui cua chim me hay td bi rung khi chim me dau vao la tin hieu de chim non ha md?
- HS thao luan, sir dung kie'n thiic d phie'u hgc tap so 2 de tra Idi:
+ O nhiing dgng vat cd he than kinh dang ludi va chudi bach cd cau tao don gian, sd lugng te' bao than kinh ft, kha nang hgc tap kem, viec hgc va nit kinh nghiem khd khan, tudi thg ngan khdng ed nhidu thdi gian cho viec hgc tap riit kinh nghiem.
+ O ngudi va ddng vat ed he than kinh phat trien, thuan Igi cho viec hgc va riit kinh nghiem, tap tinh ngay cang hoan thien, tudi thg dai cho phep thanh lap nhidu phan xa cd didu kien, hoan thien cac tap tinh phiic tap de thich ling vdi dieu kien song phiic tap.
- Dai dien nhdm trinh bay, ldp nhan xet, bd sung.
- HS trao ddi, van dung kie'n thiic thuc te de tra Idi.
- GV nhan xet va thdng bao tap tinh ha md ciia chim non do kich thich rung td chii khdng phai la miii cua chim me.
- GV yeu cau HS lay vi du vd kich thich dau hieu xuai hien tap tinh d ddng vat.
- GV bd sung kie'n thiic: + Mot sd tap tinh ciia dong vat la kei qua phd'i hgp boat dgng ciia he th^n kinh va noi tiet. Vi du: Tap tinh ghep d6i va sinh san cia chim. + Hooemdn sinh due tiei ra khien con due ed boat dong khoe me, dSn du con cai, kich thich con cai tiei hooemdn dan den triing chin. Sau dd la qua trinh giao phoi va de triing ci!ia con cai.
- HS cd the tra Idi: Tin hieu la mui cua chim me hoac td bi rung.
- HS neu dugc vi du + Anh den sang hoac anh lira trong dem la kich thich da'u hieu lam xuat hien tap tinh hudng sang d con thieu than.
+ Rung td lam ong thg bay ra rat nhidu.
Ket luan chung: HS dgc
IV. KIEM TRA DANH GIA
- HS tdm tat kien thiic co ban cua bai. - HS lam bai tap trac nghiem.
1. Tap tinh ddng vat la:
a) Kha nang co the phan ung lai cac kich thich ciia mdi trudng de tdn tai va phat trien.
b) Su van ddng sinh trudng ve mgi phia theo cac tac nhan ben ngoai hay ben trong.
c) Van ddng sinh trudng dinh hudng theo tac nhan mdt phia cua mdi trudng song.
d) Chudi nhiing phan ung ma co the tra Idi lai kieh thich dd dam bao cho su tdn tai cia ca thd va ciia loai.
2. Hau hei tap tinh ciia dgng vat bac tha'p la
a) Tap tinh bam sinh c) Tap tinh hdn hgp
b) Tap tinh hgc dugc d) Tap tinh hgc dugc, tap tinh hdn hgp. 3. Meo bat chugt la:
a) Tap tinh bam sinh e) Tap tinh hdn hgp b) Tap tinh thir sinh d) Ban nang. 4. Tap tinh kie'm an va san mdi la:
a) Tap tinh bam sinh c) Tap tinh hdn hgp b) Tap tinh hgc dugc d) Ca a, b, c.
V. DAN DO
- Hgc bai tra Idi cau hdi SGK trang 117. - On tap va tim hidu vd tap tinh d ddng vat.
Bai 31. TAP TINH (Tiep theo)
I. MUC TIEU 1. Kien thurc 1. Kien thurc
- HS trinh bay dugc mdt sd hinh thiic hgc tap chinh d ddng vat.
+ Tap tinh kie'm an - San mdi.
+ Tap tfnh sinh san (khoe me, lam td, ap trung...). + Tap tfnh bao ve vung lanh thd vi thiie an, vi ban tinh. + Tap tfnh di cu.
2. KT nang
- Quan sat tranh hinh nhan biei kien thiic. - Van dung kien thiic vao thuc tidn. - Khai quat hoa kien thiic.