B\u00e0i 1 (trang 185 SGK Sinh h\u1ecdc 12):\u00a0Th\u1ebf n\u00e0o l\u00e0 di\u1ec5n th\u1ebf sinh th\u00e1i?<\/strong><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n Di\u1ec5n th\u1ebf sinh th\u00e1i l\u00e0 qu\u00e1 tr\u00ecnh bi\u1ebfn \u0111\u1ed5i tu\u1ea7n t\u1ef1 c\u1ee7a qu\u1ea7n x\u00e3 qua c\u00e1c giai \u0111o\u1ea1n, t\u01b0\u01a1ng \u1ee9ng v\u1edbi s\u1ef1 bi\u1ebfn \u0111\u1ed5i c\u1ee7a m\u00f4i tr\u01b0\u1eddng.<\/p>\n B\u00e0i 2 (trang 185 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y m\u00f4 t\u1ea3 qu\u00e1 tr\u00ecnh di\u1ec5n th\u1ebf c\u1ee7a m\u1ed9t qu\u1ea7n x\u00e3 sinh v\u1eadt n\u00e0o \u0111\u00f3 x\u1ea3y ra \u1edf \u0111\u1ecba ph\u01b0\u01a1ng c\u1ee7a em, ho\u1eb7c \u1edf \u0111\u1ecba ph\u01b0\u01a1ng kh\u00e1c m\u00e0 em bi\u1ebft.<\/strong><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n V\u00ed d\u1ee5: Di\u1ec5n th\u1ebf sinh th\u00e1i c\u1ee7a m\u1ed9t khu r\u1eebng.<\/p>\n M\u1ed9t khu r\u1eebng \u0111ang xanh t\u1ed1t b\u00ecnh th\u01b0\u1eddng, b\u1ecb nh\u00f3m ng\u01b0\u1eddi du canh du c\u01b0 \u0111\u1ebfn t\u00e0n ph\u00e1 l\u00e0m n\u01b0\u01a1ng r\u1eaby. M\u1ed9t th\u1eddi gian sau, \u0111\u1ea5t h\u1ebft m\u00e0u m\u1ee1, tr\u1ed3ng c\u00e2y kh\u00f4ng n\u0103ng su\u1ea5t, h\u1ecd b\u1ecf \u0111i, \u0111\u1ec3 l\u1ea1i khu \u0111\u1ea5t hoang. Sau \u0111\u00f3, c\u1ecf m\u1ecdc d\u1ea7n v\u00e0 h\u00ecnh th\u00e0nh nh\u1eefng tr\u1ea3ng c\u1ecf, ti\u1ebfp l\u00e0 s\u1ef1 h\u00ecnh th\u00e0nh nh\u1eefng c\u00e2y b\u1ee5i v\u00e0 nh\u1eefng c\u00e2y g\u1ed7 nh\u1ecf.<\/p>\n Sau m\u1ed9t th\u1eddi gian kh\u00e1 d\u00e0i, r\u1eebng \u0111\u01b0\u1ee3c h\u1ed3i ph\u1ee5c l\u1ea1i xu\u1ea5t hi\u1ec7n nh\u1eefng c\u00e2y g\u1ed7 l\u1edbn v\u00e0 nhi\u1ec1u t\u1ea7ng c\u00e2y.<\/p>\n B\u00e0i 3 (trang 185 SGK Sinh h\u1ecdc 12):\u00a0Trong m\u1ed9t khu r\u1eebng nhi\u1ec7t \u0111\u1edbi c\u00f3 c\u00e1c c\u00e2y g\u1ed7 l\u1edbn v\u00e0 nh\u1ecf m\u1ecdc g\u1ea7n nhau. V\u00e0o m\u1ed9t ng\u00e0y c\u00f3 gi\u00f3 l\u1edbn, m\u1ed9t c\u00e2y to b\u1ecb \u0111\u1ed5 \u1edf gi\u1eefa r\u1eebng t\u1ea1o n\u00ean m\u1ed9t kho\u1ea3ng tr\u1ed1ng l\u1edbn. Em h\u00e3y d\u1ef1 \u0111o\u00e1n qu\u00e1 tr\u00ecnh di\u1ec5n th\u1ebf x\u1ea3y ra trong kho\u1ea3ng tr\u1ed1ng \u0111\u00f3.<\/strong><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n Di\u1ec5n th\u1ebf x\u1ea3y ra trong kho\u1ea3ng tr\u1ed1ng \u0111\u00f3:<\/p>\n * Giai \u0111o\u1ea1n ti\u00ean phong: C\u00e1c c\u00e2y c\u1ecf \u01b0a s\u00e1ng t\u1edbi s\u1ed1ng trong kho\u1ea3ng tr\u1ed1ng.<\/p>\n * Giai \u0111o\u1ea1n ti\u1ebfp theo:<\/p>\n – C\u00e2y b\u1ee5i nh\u1ecf \u01b0a s\u00e1ng t\u1edbi s\u1ed1ng c\u00f9ng c\u00e2y c\u1ecf.<\/p>\n – C\u00e2y g\u1ed7 nh\u1ecf \u01b0a s\u00e1ng t\u1edbi s\u1ed1ng c\u00f9ng c\u00e2y b\u1ee5i, c\u00e1c c\u00e2y c\u1ecf ch\u1ecbu b\u00f3ng v\u00e0 \u01b0a b\u00f3ng d\u1ea7n d\u1ea7n v\u00e0o s\u1ed1ng d\u01b0\u1edbi b\u00f3ng c\u00e2y g\u1ed7 nh\u1ecf v\u00e0 c\u00e2y b\u1ee5i.<\/p>\n – C\u00e2y c\u1ecf v\u00e0 c\u00e2y b\u1ee5i \u01b0a s\u00e1ng d\u1ea7n d\u1ea7n b\u1ecb ch\u1ebft do thi\u1ebfu \u00e1nh s\u00e1ng, thay th\u1ebf ch\u00fang l\u00e0 c\u00e1c c\u00e2y b\u1ee5i v\u00e0 c\u00e2y c\u1ecf \u01b0a b\u00f3ng.<\/p>\n – C\u00e2y g\u1ed7 \u01b0a s\u00e1ng c\u1ea1nh tranh \u00e1nh s\u00e1ng m\u1ea1nh m\u1ebd v\u1edbi c\u00e1c c\u00e2y kh\u00e1c v\u00e0 d\u1ea7n d\u1ea7n th\u1eafng th\u1ebf chi\u1ebfm ph\u1ea7n l\u1edbn kho\u1ea3ng tr\u1ed1ng.<\/p>\n * Giai \u0111o\u1ea1n cu\u1ed1i: Nhi\u1ec1u t\u1ea7ng c\u00e2y l\u1ea5p k\u00edn kho\u1ea3ng tr\u1ed1ng, g\u1ed3m c\u00f3 t\u1ea7ng c\u00e2y th\u00e2n g\u1ed7 l\u1edbn \u01b0a s\u00e1ng ph\u00eda tr\u00ean c\u00f9ng, c\u00e2y g\u1ed7 nh\u1ecf v\u00e0 c\u00e2y b\u1ee5i ch\u1ecbu b\u00f3ng \u1edf l\u01b0ng ch\u1eebng, c\u00e1c c\u00e2y b\u1ee5i nh\u1ecf v\u00e0 c\u1ecf \u01b0a b\u00f3ng \u1edf ph\u00eda d\u01b0\u1edbi.<\/p>\n B\u00e0i 4 (trang 185 SGK Sinh h\u1ecdc 12):\u00a0Ho\u1ea1t \u0111\u1ed9ng khai th\u00e1c t\u00e0i nguy\u00ean kh\u00f4ng h\u1ee3p l\u00ed c\u1ee7a con ng\u01b0\u1eddi c\u00f3 th\u1ec3 coi l\u00e0 ho\u1ea1t \u0111\u1ed9ng “t\u1ef1 \u0111\u00e0o huy\u1ec7t ch\u00f4n m\u00ecnh” c\u1ee7a di\u1ec5n th\u1ebf sinh th\u00e1i \u0111\u01b0\u1ee3c kh\u00f4ng? T\u1ea1i sao?<\/strong><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n Ho\u1ea1t \u0111\u1ed9ng khai th\u00e1c t\u00e0i nguy\u00ean kh\u00f4ng h\u1ee3p l\u00ed c\u1ee7a con ng\u01b0\u1eddi c\u00f3 th\u1ec3 coi l\u00e0 h\u00e0nh \u0111\u1ed9ng “t\u1ef1 \u0111\u00e0o huy\u1ec7t ch\u00f4n m\u00ecnh” c\u1ee7a di\u1ec5n th\u1ebf sinh th\u00e1i. Vi\u1ec7c l\u00e0m \u0111\u00f3 g\u00e2y ra m\u1ed9t lo\u1ea1t c\u00e1c h\u1eadu qu\u1ea3:<\/p>\n – L\u00e0m bi\u1ebfn \u0111\u1ed5i v\u00e0 d\u1eabn t\u1edbi m\u1ea5t m\u00f4i tr\u01b0\u1eddng s\u1ed1ng c\u1ee7a nhi\u1ec1u lo\u00e0i sinh v\u1eadt v\u00e0 gi\u1ea3m \u0111a d\u1ea1ng sinh h\u1ecdc.<\/p>\n – Th\u1ea3m th\u1ef1c v\u1eadt b\u1ecb m\u1ea5t d\u1ea7n s\u1ebd d\u1ea7n t\u1edbi x\u00f3i m\u00f2n \u0111\u1ea5t, bi\u1ebfn \u0111\u1ed5i kh\u00ed h\u1eadu,\u2026 v\u00e0 l\u00e0 nguy\u00ean nh\u00e2n c\u1ee7a nhi\u1ec1u thi\u00ean tai nh\u01b0 l\u1ee5t l\u1ed9i, h\u1ea1n h\u00e1n, \u0111\u1ea5t nhi\u1ec5m m\u1eb7n,\u2026<\/p>\n – M\u00f4i tr\u01b0\u1eddng m\u1ea5t c\u00e2n b\u1eb1ng sinh th\u00e1i, k\u00e9m \u1ed5n \u0111\u1ecbnh d\u1ec5 g\u00e2y ra nhi\u1ec1u b\u1ec7nh t\u1eadt cho ng\u01b0\u1eddi v\u00e0 sinh v\u1eadt,\u2026<\/p>\n Nh\u1eefng h\u1eadu qu\u1ea3 tr\u00ean s\u1ebd l\u00e0m cho cu\u1ed9c s\u1ed1ng c\u1ee7a con ng\u01b0\u1eddi b\u1ecb \u1ea3nh h\u01b0\u1edfng n\u1eb7ng n\u1ec1, kh\u00f4ng \u1ed5n \u0111\u1ecbnh.<\/p>\n Tuy nhi\u00ean, con ng\u01b0\u1eddi kh\u00e1c v\u1edbi sinh v\u1eadt kh\u00e1c l\u00e0 c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh c\u00e1c h\u00e0nh \u0111\u1ed9ng c\u1ee7a m\u00ecnh \u0111\u1ec3 khai th\u00e1c t\u00e0i nguy\u00ean h\u1ee3p l\u00ed, b\u00e0o v\u1ec7 m\u00f4i tr\u01b0\u1eddng c\u1ee7a con ng\u01b0\u1eddi v\u00e0 c\u00e1c sinh v\u1eadt kh\u00e1c tr\u00ean Tr\u00e1i \u0110\u1ea5t. Con ng\u01b0\u1eddi v\u1edbi kh\u1ea3 n\u0103ng khoa h\u1ecdc \u0111ang ng\u00e0y c\u00e0ng c\u1ea3i t\u1ea1o t\u1ef1 nhi\u00ean l\u00e0m cho qu\u1ea7n x\u00e3 sinh v\u1eadt phong ph\u00fa h\u01a1n. V\u00ec v\u1eady, ch\u00fang ta tin t\u01b0\u1edfng r\u1eb1ng ho\u1ea1t \u0111\u1ed9ng khai th\u00e1c t\u00e0i nguy\u00ean c\u1ee7a con ng\u01b0\u1eddi s\u1ebd d\u1ea7n d\u1ea7n h\u1ee3p l\u00ed v\u00e0 m\u00f4i tr\u01b0\u1eddng s\u1ed1ng tr\u00ean Tr\u00e1i \u0110\u1ea5t s\u1ebd \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7.<\/p>\n <\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":" B\u00e0i 1 (trang 185 SGK Sinh h\u1ecdc 12):\u00a0Th\u1ebf n\u00e0o l\u00e0 di\u1ec5n th\u1ebf sinh th\u00e1i? L\u1eddi gi\u1ea3i: Di\u1ec5n th\u1ebf sinh th\u00e1i l\u00e0 qu\u00e1 tr\u00ecnh bi\u1ebfn \u0111\u1ed5i tu\u1ea7n t\u1ef1 c\u1ee7a qu\u1ea7n x\u00e3 qua c\u00e1c giai \u0111o\u1ea1n, t\u01b0\u01a1ng \u1ee9ng v\u1edbi s\u1ef1 bi\u1ebfn \u0111\u1ed5i c\u1ee7a m\u00f4i tr\u01b0\u1eddng. B\u00e0i 2 (trang 185 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y m\u00f4 t\u1ea3 qu\u00e1 tr\u00ecnh […]<\/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