B\u00e0i 1 (trang 170 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y gi\u1ea3i th\u00edch c\u00e1c kh\u00e1i ni\u1ec7m sau: m\u1ee9c \u0111\u1ed9 sinh s\u1ea3n, m\u1ee9c \u0111\u1ed9 t\u1eed vong, m\u1ee9c \u0111\u1ed9 xu\u1ea5t c\u01b0, m\u1ee9c \u0111\u1ed9 nh\u1eadp c\u01b0.<\/strong><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n – M\u1ee9c \u0111\u1ed9 sinh s\u1ea3n: l\u00e0 s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 \u0111\u01b0\u1ee3c sinh ra trong m\u1ed9t \u0111\u01a1n v\u1ecb th\u1eddi gian.<\/p>\n – M\u1ee9c \u0111\u1ed9 t\u1eed vong: l\u00e0 s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 b\u1ecb ch\u1ebft trong m\u1ed9t kho\u1ea3ng th\u1eddi gian.<\/p>\n – Xu\u1ea5t c\u01b0: l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng m\u1ed9t s\u1ed1 c\u00e1 th\u1ec3 r\u1eddi b\u1ecf qu\u1ea7n th\u1ec3 c\u1ee7a m\u00ecnh chuy\u1ec3n sang s\u1ed1ng \u1edf qu\u1ea7n th\u1ec3 b\u00ean c\u1ea1nh ho\u1eb7c di chuy\u1ec3n \u0111\u1ebfn n\u01a1i \u1edf m\u1edbi.<\/p>\n – Nh\u1eadp c\u01b0: l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng m\u1ed9t s\u1ed1 c\u00e1 th\u1ec3 n\u1eb1m ngo\u00e0i qu\u1ea7n th\u1ec3 chuy\u1ec3n t\u1edbi s\u1ed1ng trong qu\u1ea7n th\u1ec3.<\/p>\n B\u00e0i 2 (trang 170 SGK Sinh h\u1ecdc 12):\u00a0M\u1ed9t qu\u1ea7n th\u1ec3 c\u00f3 k\u00edch th\u01b0\u1edbc \u1ed5n \u0111\u1ecbnh th\u00ec 4 nh\u00e2n t\u1ed1 l\u00e0 m\u1ee9c \u0111\u1ed9 sinh s\u1ea3n, m\u1ee9c \u0111\u1ed9 t\u1eed vong, m\u1ee9c \u0111\u1ed9 xu\u1ea5t c\u01b0 v\u00e0 m\u1ee9c \u0111\u1ed9 nh\u1eadp c\u01b0 c\u00f3 quan h\u1ec7 v\u1edbi nhau nh\u01b0 th\u1ebf n\u00e0o?<\/strong><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n – M\u1ed9t qu\u1ea7n th\u1ec3 c\u00f3 k\u00edch th\u01b0\u1edbc \u1ed5n \u0111\u1ecbnh th\u00ec 4 y\u1ebfu t\u1ed1 m\u1ee9c \u0111\u1ed9 sinh s\u1ea3n (b), m\u1ee9c \u0111\u1ed9 t\u1eed vong (d), xu\u1ea5t c\u01b0 (e) v\u00e0 nh\u1eadp c\u01b0 (i) quan h\u1ec7 v\u1edbi nhau: s\u1ed1 c\u00e1 th\u1ec3 m\u1edbi sinh ra c\u1ed9ng v\u1edbi s\u1ed1 c\u00e1 th\u1ec3 nh\u1eadp c\u01b0 b\u1eb1ng v\u1edbi s\u1ed1 c\u00e1 th\u1ec3 t\u1eed vong c\u1ed9ng s\u1ed1 c\u00e1 th\u1ec3 xu\u1ea5t c\u01b0 (b + i = d + e).<\/p>\n B\u00e0i 3 (trang 170 SGK Sinh h\u1ecdc 12):\u00a0T\u0103ng tr\u01b0\u1edfng theo ti\u1ec1m n\u0103ng sinh h\u1ecdc c\u1ee7a qu\u1ea7n th\u1ec3 kh\u00e1c v\u1edbi t\u0103ng tr\u01b0\u1edfng th\u1ef1c t\u1ebf nh\u01b0 th\u1ebf n\u00e0o?<\/strong><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n T\u0103ng tr\u01b0\u1edfng theo ti\u1ec1m n\u0103ng sinh h\u1ecdc c\u1ee7a qu\u1ea7n th\u1ec3 kh\u00e1c v\u1edbi t\u0103ng tr\u01b0\u1edfng th\u1ef1c t\u1ebf:<\/p>\n * T\u0103ng tr\u01b0\u1edfng qu\u1ea7n th\u1ec3 theo ti\u1ec1m n\u0103ng sinh h\u1ecdc (\u0111\u01b0\u1eddng cong t\u0103ng tr\u01b0\u1edfng c\u00f3 h\u00ecnh ch\u1eef J): Khi \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng kh\u00f4ng gi\u1edbi h\u1ea1n (ngu\u1ed3n s\u1ed1ng c\u1ee7a m\u00f4i tr\u01b0\u1eddng d\u1ed3i d\u00e0o, kh\u00f4ng gian c\u01b0 tr\u00fa kh\u00f4ng gi\u1edbi h\u1ea1n v\u00e0 s\u1ee9c sinh s\u1ea3n c\u1ee7a c\u00e1c c\u00e1 th\u1ec3 l\u00e0 r\u1ea5t l\u1edbn) th\u00ec qu\u1ea7n th\u1ec3 t\u0103ng tr\u01b0\u1edfng theo ti\u1ec1m n\u0103ng sinh h\u1ecdc.<\/p>\n \u0110\u01b0\u1eddng cong bi\u1ec3u th\u1ecb t\u0103ng tr\u01b0\u1edfng c\u1ee7a qu\u1ea7n th\u1ec3: lu\u00f4n lu\u00f4n t\u0103ng.<\/p>\n * T\u0103ng tr\u01b0\u1edfng th\u1ef1c t\u1ebf (\u0111\u01b0\u1eddng cong t\u0103ng tr\u01b0\u1edfng h\u00ecnh ch\u1eef S): Khi \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng b\u1ecb gi\u1edbi h\u1ea1n (\u0111i\u1ec1u ki\u1ec7n s\u1ed1ng kh\u00f4ng thu\u1eadn l\u1ee3i, h\u1ea1n ch\u1ebf kh\u1ea3 n\u0103ng sinh s\u1ea3n, bi\u1ebfn \u0111\u1ed9ng s\u1ed1 l\u01b0\u1ee3ng\u2026) th\u00ec qu\u1ea7n th\u1ec3 t\u0103ng tr\u01b0\u1edfng th\u1ef1c t\u1ebf.<\/p>\n \u0110\u01b0\u1eddng cong bi\u1ec3u th\u1ecb t\u0103ng tr\u01b0\u1edfng c\u1ee7a qu\u1ea7n th\u1ec3: tho\u1ea1t \u0111\u1ea7u t\u0103ng nhanh d\u1ea7n, sau \u0111\u00f3 t\u1ed1c \u0111\u1ed9 t\u0103ng tr\u01b0\u1edfng c\u1ee7a qu\u1ea7n th\u1ec3 gi\u1ea3m \u0111i, \u0111\u01b0\u1eddng cong chuy\u1ec3n sang ngang.<\/p>\n B\u00e0i 4 (trang 170 SGK Sinh h\u1ecdc 12):\u00a0M\u1ee9c \u0111\u1ed9 sinh s\u1ea3n, m\u1ee9c \u0111\u1ed9 t\u1eed vong, m\u1ee9c \u0111\u1ed9 xu\u1ea5t c\u01b0 v\u00e0 nh\u1eadp c\u01b0 c\u1ee7a qu\u1ea7n th\u1ec3 ng\u01b0\u1eddi c\u00f3 \u1ea3nh h\u01b0\u1edfng nh\u01b0 th\u1ebf n\u00e0o t\u1edbi t\u0103ng d\u00e2n s\u1ed1? L\u1ea5y v\u00ed d\u1ee5 c\u1ee7a Vi\u1ec7t Nam \u0111\u1ec3 minh ho\u1ea1.<\/strong><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n * C\u00e1c nh\u00e2n t\u1ed1 \u1ea3nh h\u01b0\u1edfng t\u1edbi t\u0103ng d\u00e2n s\u1ed1:<\/p>\n – M\u1ee9c \u0111\u1ed9 sinh s\u1ea3n: Sinh s\u1ea3n qu\u00e1 cao l\u00e0 nguy\u00ean nh\u00e2n \u0111\u01b0a t\u1edbi t\u0103ng tr\u01b0\u1edfng d\u00e2n s\u1ed1 nhanh ch\u00f3ng c\u1ee7a m\u1ed7i qu\u1ed1c gia. \u0110\u1ec3 ph\u00e1t tri\u1ec3n d\u00e2n s\u1ed1 b\u1ec1n v\u1eefng, c\u1ea7n c\u00f3 c\u00e1c bi\u1ec7n ph\u00e1p nh\u1eb1m h\u1ea1 m\u1ee9c \u0111\u1ed9 sinh.<\/p>\n – M\u1ee9c \u0111\u1ed9 t\u1eed vong: M\u1ee9c \u0111\u1ed9 t\u1eed vong l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 c\u00f3 t\u00e1c \u0111\u1ed9ng t\u1edbi t\u1ec9 l\u1ec7 t\u0103ng d\u00e2n s\u1ed1. N\u1ebfu m\u1ee9c \u0111\u1ed9 t\u1eed vong th\u1ea5p v\u00e0 sinh s\u1ea3n qu\u00e1 cao th\u00ec d\u00e2n s\u1ed1 s\u1ebd c\u00f3 nguy c\u01a1 t\u0103ng nhanh ch\u00f3ng. V\u00ec v\u1eady, \u0111\u1ec3 \u1ed5n \u0111\u1ecbnh d\u00e2n s\u1ed1, b\u00ean c\u1ea1nh n\u00e2ng cao tu\u1ed5i th\u1ecd c\u1ee7a ng\u01b0\u1eddi d\u00e2n c\u00e0ng c\u1ea7n th\u1ef1c hi\u1ec7n bi\u1ec7n ph\u00e1p gi\u1ea3m m\u1ee9c \u0111\u1ed9 sinh.<\/p>\n – Xu\u1ea5t c\u01b0 v\u00e0 nh\u1eadp c\u01b0: Xu\u1ea5t c\u01b0 v\u00e0 nh\u1eadp c\u01b0 thi\u1ebfu ki\u1ec3m so\u00e1t s\u1ebd \u1ea3nh h\u01b0\u1edfng r\u1ea5t l\u1edbn t\u1edbi ph\u00e1t tri\u1ec3n d\u00e2n s\u1ed1 c\u1ee7a m\u1ed9t v\u00f9ng, c\u1ee7a m\u1ed9t qu\u1ed1c gia c\u00f3 th\u1ec3 t\u0103ng ho\u1eb7c gi\u1ea3m qu\u00e1 m\u1ee9c. V\u00ec v\u1eady c\u1ea7n ph\u00e2n b\u1ed1 d\u00e2n c\u01b0 h\u1ee3p l\u00ed \u0111\u1ea3m b\u1ea3o s\u1ef1 c\u00e2n gi\u1eefa th\u00e0nh th\u1ecb, n\u00f4ng th\u00f4n, \u0111\u1ed3ng b\u1eb1ng, mi\u1ec1n n\u00fai v\u00e0 gi\u1eefa c\u00e1c v\u00f9ng kinh t\u1ebf.<\/p>\n * V\u00ed d\u1ee5:<\/p>\n D\u00e2n s\u1ed1 \u1edf Vi\u1ec7t Nam t\u0103ng kh\u00e1 nhanh, ch\u1ec9 trong v\u00f2ng 57 n\u0103m d\u00e2n s\u1ed1 \u0111\u00e3 t\u0103ng 18 tri\u1ec7u (n\u0103m 1945) l\u00ean t\u1edbi 82 tri\u1ec7u (n\u0103m 2004), t\u1ee9c t\u0103ng g\u1ea5p 4,5 l\u1ea7n.<\/p>\n B\u00e0i 5 (trang 170 SGK Sinh h\u1ecdc 12):\u00a0H\u1eadu qu\u1ea3 c\u1ee7a t\u0103ng d\u00e2n s\u1ed1 qu\u00e1 nhanh l\u00e0 g\u00ec? Ch\u00fang ta c\u1ea7n l\u00e0m g\u00ec \u0111\u1ec3 kh\u1eafc ph\u1ee5c h\u1eadu qu\u1ea3 \u0111\u00f3?<\/strong><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n<\/div>\n<\/div>\n \u00a0* H\u1eadu qu\u1ea3 c\u1ee7a t\u0103ng d\u00e2n s\u1ed1 qu\u00e1 nhanh:<\/p>\n T\u0103ng d\u00e2n s\u1ed1 qu\u00e1 nhanh v\u00e0 ph\u00e2n b\u1ed1 d\u00e2n c\u01b0 kh\u00f4ng h\u1ee3p l\u00ed l\u00e0 nguy\u00ean nh\u00e2n ch\u1ee7 y\u1ebfu l\u00e0m cho ch\u1ea5t l\u01b0\u1ee3ng m\u00f4i tr\u01b0\u1eddng gi\u1ea3m s\u00fat (\u00f4 nhi\u1ec5m m\u00f4i tr\u01b0\u1eddng n\u01b0\u1edbc, \u0111\u1ea5t, kh\u00f4ng kh\u00ed\u2026), t\u1eeb \u0111\u00f3 \u1ea3nh h\u01b0\u1edfng t\u1edbi ch\u1ea5t l\u01b0\u1ee3ng cu\u1ed9c s\u1ed1ng c\u1ee7a m\u1ed7i con ng\u01b0\u1eddi (thi\u1ebfu n\u01a1i \u1edf, d\u1ecbch v\u1ee5 y t\u1ebf, gi\u00e1o d\u1ee5c c\u00f2n thi\u1ebfu c\u01a1 s\u1edf v\u1eadt ch\u1ea5t,\u2026).<\/p>\n * Nh\u1eefng vi\u1ec7c c\u1ea7n l\u00e0m \u0111\u1ec3 kh\u1eafc ph\u1ee5c h\u1eadu qu\u1ea3 c\u1ee7a vi\u1ec7c ph\u00e1t tri\u1ec3n d\u00e2n s\u1ed1 kh\u00f4ng h\u1ee3p l\u00ed:<\/p>\n – Th\u1ef1c hi\u1ec7n tuy\u00ean truy\u1ec1n, ch\u00ednh x\u00e1c x\u00e3 h\u1ed9i, k\u1ebf ho\u1ea1ch ho\u00e1 gia.<\/p>\n – \u0110i\u1ec1u ch\u1ec9nh c\u01a1 c\u1ea5u d\u00e2n s\u1ed1.<\/p>\n – Th\u1ef1c hi\u1ec7n ph\u00e2n b\u1ed1 d\u00e2n c\u01b0 h\u1ee3p l\u00ed gi\u1eefa c\u00e1c khu v\u1ef1c, v\u00f9ng \u0111\u1ecba l\u00ed kinh t\u1ebf v\u00e0 c\u00e1c \u0111\u01a1n v\u1ecb h\u00e0nh ch\u00ednh.<\/p>\n – Th\u1ef1c hi\u1ec7n c\u00e1c bi\u1ec7n ph\u00e1p n\u00e2ng cao ch\u1ea5t l\u01b0\u1ee3ng d\u00e2n s\u1ed1 nh\u01b0 t\u0103ng c\u01b0\u1eddng ch\u0103m s\u00f3c s\u1ee9c kho\u1ebb nh\u00e2n d\u00e2n, \u0111\u1ea9y m\u1ea1nh phong tr\u00e0o r\u00e8n luy\u1ec7n th\u00e2n th\u1ec3, n\u00e2ng cao tr\u00ecnh \u0111\u1ed9 gi\u00e1o d\u1ee5c v\u00e0 ph\u00e1t tri\u1ec3n tr\u00ed tu\u1ec7\u2026<\/p>\n <\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":" B\u00e0i 1 (trang 170 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y gi\u1ea3i th\u00edch c\u00e1c kh\u00e1i ni\u1ec7m sau: m\u1ee9c \u0111\u1ed9 sinh s\u1ea3n, m\u1ee9c \u0111\u1ed9 t\u1eed vong, m\u1ee9c \u0111\u1ed9 xu\u1ea5t c\u01b0, m\u1ee9c \u0111\u1ed9 nh\u1eadp c\u01b0. L\u1eddi gi\u1ea3i: – M\u1ee9c \u0111\u1ed9 sinh s\u1ea3n: l\u00e0 s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 \u0111\u01b0\u1ee3c sinh ra trong m\u1ed9t \u0111\u01a1n v\u1ecb th\u1eddi gian. – […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1307],"tags":[1372,1373],"yoast_head":"\n