B\u00e0i 2 (trang 135 SGK Sinh h\u1ecdc 12):\u00a0T\u1ea1i sao b\u00ean c\u1ea1nh nh\u1eefng lo\u00e0i c\u00f3 t\u1ed5 ch\u1ee9c c\u01a1 th\u1ec3 r\u1ea5t ph\u1ee9c t\u1ea1p v\u1eabn t\u1ed3n t\u1ea1i nh\u1eefng lo\u00e0i c\u00f3 c\u1ea5u tr\u00fac kh\u00e1 \u0111\u01a1n gi\u1ea3n?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
B\u00ean c\u1ea1nh nh\u1eefng lo\u00e0i c\u00f3 c\u1ea5u t\u1ea1o c\u01a1 th\u1ec3 ph\u1ee9c t\u1ea1p v\u1eabn c\u00f3 r\u1ea5t nhi\u1ec1u lo\u00e0i c\u00f3 c\u1ea5u t\u1ea1o \u0111\u01a1n gi\u1ea3n nh\u01b0 c\u00e1c lo\u00e0i vi khu\u1ea9n. S\u1edf d\u0129 nh\u01b0 v\u1eady l\u00e0 do qu\u00e1 tr\u00ecnh ti\u1ebfn ho\u00e1 lu\u00f4n duy tr\u00ec nh\u1eefng qu\u1ea7n th\u1ec3 sinh v\u1eadt th\u00edch nghi nh\u1ea5t.<\/p>\n
C\u00e1c lo\u00e0i vi khu\u1ea9n c\u00f3 k\u00edch th\u01b0\u1edbc nh\u1ecf, c\u1ea5u t\u1ea1o \u0111\u01a1n gi\u1ea3n l\u1ea1i c\u00f3 l\u1ee3i th\u1ebf th\u00edch nghi nhanh ch\u00f3ng v\u1edbi m\u00f4i tr\u01b0\u1eddng. Tr\u00ean c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb th\u1eddi gian ti\u1ebfn ho\u00e1, do ch\u00fang sinh s\u1ea3n nhanh, \u0111\u1ed9t bi\u1ebfn ph\u00e1t sinh nhanh n\u00ean nhanh ch\u00f3ng t\u1ea1o ra c\u00e1c qu\u1ea7n th\u1ec3 th\u00edch nghi. \u0110\u1ed3ng th\u1eddi ch\u00fang ti\u1ebfn h\u00f3a theo h\u01b0\u1edbng \u0111a d\u1ea1ng c\u00e1c h\u00ecnh th\u1ee9c chuy\u1ec3n h\u00f3a v\u1eadt ch\u1ea5t th\u00edch nghi cao \u0111\u1ed9 v\u1edbi c\u00e1c \u1ed5 sinh th\u00e1i kh\u00e1c nhau.<\/p>\n
B\u00e0i 3 (trang 135 SGK Sinh h\u1ecdc 12):\u00a0M\u1ed9t s\u1ed1 lo\u00e0i trong qu\u00e1 tr\u00ecnh ti\u1ebfn ho\u00e1 l\u1ea1i ti\u00eau gi\u1ea3m m\u1ed9t s\u1ed1 c\u01a1 quan thay v\u00ec t\u0103ng s\u1ed1 l\u01b0\u1ee3ng c\u00e1c c\u01a1 quan. Nguy\u00ean nh\u00e2n n\u00e0o sau \u0111\u00e2y gi\u1ea3i th\u00edch \u0111\u00fang v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y?<\/strong><\/p>\na) Do m\u00f4i tr\u01b0\u1eddng s\u1ed1ng thay \u0111\u1ed5i \u0111\u00e3 t\u1ea1o ra nh\u1eefng \u0111\u1ed9t bi\u1ebfn m\u1edbi.<\/p>\n
b) S\u1ef1 ti\u00eau gi\u1ea3m c\u01a1 quan gi\u00fap sinh v\u1eadt th\u00edch nghi t\u1ed1t h\u01a1n.<\/p>\n
c) C\u00f3 xu h\u01b0\u1edbng ti\u1ebfn ho\u00e1 quay v\u1ec1 d\u1ea1ng t\u1ed5 ti\u00ean.<\/p>\n
d) T\u1ea5t c\u1ea3 c\u00e1c nguy\u00ean nh\u00e2n n\u00eau tr\u00ean \u0111\u1ec1u \u0111\u00fang.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
\u0110\u00e1p \u00e1n: b.<\/p>\n
<\/p>\n<\/div>\n<\/div>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
B\u00e0i 1 (trang 135 SGK Sinh h\u1ecdc 12):\u00a0Gi\u1ea3i th\u00edch qu\u00e1 tr\u00ecnh ti\u1ebfn ho\u00e1 l\u1edbn h\u00ecnh th\u00e0nh n\u00ean c\u00e1c \u0111\u01a1n v\u1ecb ph\u00e2n lo\u1ea1i tr\u00ean lo\u00e0i b\u1eb1ng s\u01a1 \u0111\u1ed3 ti\u1ebfn ho\u00e1 ph\u00e2n nh\u00e1nh. L\u1eddi gi\u1ea3i: – C\u00e1c lo\u00e0i sinh v\u1eadt \u0111\u1ec1u \u0111\u01b0\u1ee3c ti\u1ebfn h\u00f3a t\u1eeb t\u1ed5 ti\u00ean chung theo ki\u1ec3u ti\u1ebfn h\u00f3a ph\u00e2n nh\u00e1nh. – C\u00e1c lo\u00e0i […]<\/p>\n","protected":false},"author":3,"featured_media":22551,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1307],"tags":[1397,1398],"yoast_head":"\n
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![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/bai-1-trang-135-sgk-sinh-12.png\")
<\/p>\n