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{"id":22529,"date":"2018-03-19T23:03:58","date_gmt":"2018-03-19T16:03:58","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=22529"},"modified":"2018-03-19T23:03:58","modified_gmt":"2018-03-19T16:03:58","slug":"phan-bay-chuong-2-bai-40-quan-xa-sinh-vat-va-mot-so-dac-trung-co-ban-cua-quan-xa","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/phan-bay-chuong-2-bai-40-quan-xa-sinh-vat-va-mot-so-dac-trung-co-ban-cua-quan-xa\/","title":{"rendered":"Ph\u1ea7n B\u1ea3y – Ch\u01b0\u01a1ng 2 – B\u00e0i 40: Qu\u1ea7n x\u00e3 sinh v\u1eadt v\u00e0 m\u1ed9t s\u1ed1 \u0111\u1eb7c tr\u01b0ng c\u01a1 b\u1ea3n c\u1ee7a qu\u1ea7n x\u00e3"},"content":{"rendered":"

B\u00e0i 1 (trang 180 SGK Sinh h\u1ecdc 12):\u00a0Th\u1ebf n\u00e0o l\u00e0 m\u1ed9t qu\u1ea7n x\u00e3 sinh v\u1eadt? N\u00eau s\u1ef1 kh\u00e1c nhau gi\u1eefa qu\u1ea7n th\u1ec3 sinh v\u1eadt v\u00e0 qu\u1ea7n x\u00e3 sinh v\u1eadt. L\u1ea5y v\u00ed d\u1ee5 minh ho\u1ea1.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

* Qu\u1ea7n x\u00e3 l\u00e0 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c qu\u1ea7n th\u1ec3 thu\u1ed9c nhi\u1ec1u lo\u00e0i kh\u00e1c nhau, c\u00f9ng s\u1ed1ng trong m\u1ed9t kh\u00f4ng gian nh\u1ea5t \u0111\u1ecbnh. C\u00e1c sinh v\u1eadt trong qu\u1ea7n x\u00e3 c\u00f3 m\u1ed1i quan h\u1ec7 g\u1eafn b\u00f3 v\u1edbi nhau nh\u01b0 m\u1ed9t th\u1ec3 th\u1ed1ng nh\u1ea5t v\u00e0 do \u0111\u00f3 qu\u1ea7n x\u00e3 c\u00f3 c\u1ea5u tr\u00fac t\u01b0\u01a1ng \u0111\u1ed1i \u1ed5n \u0111\u1ecbnh. C\u00e1c sinh v\u1eadt trong qu\u1ea7n x\u00e3 th\u00edch nghi v\u1edbi m\u00f4i tr\u01b0\u1eddng s\u1ed1ng c\u1ee7a ch\u00fang.<\/p>\n

* S\u1ef1 kh\u00e1c nhau gi\u1eefa qu\u1ea7n th\u1ec3 sinh v\u1eadt v\u00e0 qu\u1ea7n x\u00e3 sinh v\u1eadt:<\/p>\n

– Qu\u1ea7n th\u1ec3 sinh v\u1eadt l\u00e0 t\u1eadp h\u1ee3p nh\u1eefng c\u00e1 th\u1ec3 c\u00f9ng lo\u00e0i, sinh s\u1ed1ng trong m\u1ed9t kho\u1ea3ng kh\u00f4ng gian nh\u1ea5t \u0111\u1ecbnh, \u1edf m\u1ed9t th\u1eddi \u0111i\u1ec3m nh\u1ea5t \u0111\u1ecbnh. V\u00ed d\u1ee5, qu\u1ea7n th\u1ec3 c\u00e1c c\u00e2y th\u00f4ng, qu\u1ea7n th\u1ec3 ch\u00f3 s\u00f3i, qu\u1ea7n th\u1ec3 tr\u00e2u r\u1eebng,\u2026<\/p>\n

– Qu\u1ea7n x\u00e3 l\u00e0 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c qu\u1ea7n th\u1ec3 sinh v\u1eadt thu\u1ed9c nhi\u1ec1u lo\u00e0i kh\u00e1c nhau c\u00f9ng s\u1ed1ng trong m\u1ed9t kh\u00f4ng gian nh\u1ea5t \u0111\u1ecbnh. V\u00ed d\u1ee5, qu\u1ea7n x\u00e3 n\u00fai \u0111\u00e1 v\u00f4i, qu\u1ea7n x\u00e3 v\u00f9ng ng\u1eadp m\u1eb7n, qu\u1ea7n x\u00e3 h\u1ed3 c\u00e1, qu\u1ea7n x\u00e3 r\u1eebng lim, qu\u1ea7n x\u00e3 \u0111\u1ed3ng c\u1ecf, qu\u1ea7n x\u00e3 c\u00e2y b\u1ee5i,\u2026<\/p>\n

B\u00e0i 2 (trang 180 SGK Sinh h\u1ecdc 12):\u00a0C\u00e1c \u0111\u1eb7c tr\u01b0ng c\u01a1 b\u1ea3n c\u1ee7a qu\u1ea7n x\u00e3 l\u00e0 g\u00ec? H\u00e3y l\u1ea5y v\u00ed d\u1ee5 minh h\u1ecda c\u00e1c \u0111\u1eb7c tr\u01b0ng c\u01a1 b\u1ea3n c\u1ee7a qu\u1ea7n x\u00e3 sinh v\u1eadt.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

C\u00e1c \u0111\u1eb7c tr\u01b0ng c\u01a1 b\u1ea3n c\u1ee7a qu\u1ea7n x\u00e3<\/p>\n

* \u0110\u1eb7c tr\u01b0ng v\u1ec1 th\u00e0nh ph\u1ea7n lo\u00e0i: bi\u1ec3u hi\u1ec7n qua s\u1ed1 l\u01b0\u1ee3ng c\u00e1c lo\u00e0i trong qu\u1ea7n x\u00e3, s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a m\u1ed7i lo\u00e0i, lo\u00e0i \u01b0u th\u1ebf v\u00e0 lo\u00e0i \u0111\u1eb7c tr\u01b0ng.<\/p>\n

– Lo\u00e0i \u01b0u th\u1ebf l\u00e0 nh\u1eefng lo\u00e0i \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong qu\u1ea7n x\u00e3 do c\u00f3 s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 nhi\u1ec1u, sinh kh\u1ed1i l\u1edbn ho\u1eb7c do ho\u1ea1t \u0111\u1ed9ng m\u1ea1nh c\u1ee7a ch\u00fang. V\u00ed d\u1ee5:<\/p>\n

+ Qu\u1ea7n x\u00e3 r\u1eebng th\u00f4ng v\u1edbi lo\u00e0i c\u00e2y th\u00f4ng l\u00e0 lo\u00e0i chi\u1ebfm \u01b0u th\u1ebf tr\u00ean t\u00e1n r\u1eebng, c\u00e1c c\u00e2y kh\u00e1c ch\u1ec9 m\u1ecdc l\u1ebb t\u1ebb ho\u1eb7c d\u01b0\u1edbi t\u00e1n v\u00e0 ch\u1ecbu \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e2y th\u00f4ng.<\/p>\n

+ Trong qu\u1ea7n x\u00e3 ao c\u00f3 lo\u00e0i c\u00e1 m\u00e8 l\u00e0 lo\u00e0i \u01b0u th\u1ebf khi s\u1ed1 l\u01b0\u1ee3ng c\u00e1 m\u00e8 l\u1edbn h\u01a1n h\u1eb3n so v\u1edbi c\u00e1c lo\u00e0i kh\u00e1c.<\/p>\n

– Lo\u00e0i \u0111\u1eb7c tr\u01b0ng l\u00e0 lo\u00e0i ch\u1ec9 c\u00f3 \u1edf m\u1ed9t qu\u1ea7n x\u00e3 n\u00e0o \u0111\u00f3. V\u00ed d\u1ee5:<\/p>\n

+ C\u00e2y c\u1ecd l\u00e0 lo\u00e0i \u0111\u1eb7c tr\u01b0ng c\u1ee7a qu\u1ea7n x\u00e3 v\u00f9ng \u0111\u1ed3i Ph\u00fa Th\u1ecd<\/p>\n

+ C\u00e2y tr\u00e0m l\u00e0 lo\u00e0i \u0111\u1eb7c tr\u01b0ng c\u1ee7a qu\u1ea7n x\u00e3 r\u1eebng U Minh.<\/p>\n

* \u0110\u1eb7c tr\u01b0ng v\u1ec1 ph\u00e2n b\u1ed1 c\u00e1 th\u1ec3 trong kh\u00f4ng gian: t\u00f9y thu\u1ed9c v\u00e0o nhu c\u1ea7u s\u1ed1ng c\u1ee7a t\u1eebng lo\u00e0i, c\u00f3 xu h\u01b0\u1edbng gi\u1ea3m c\u1ea1nh tranh gi\u1eefa c\u00e1c lo\u00e0i v\u00e0 n\u00e2ng cao hi\u1ec7u qu\u1ea3 ngu\u1ed3n s\u1ed1ng c\u1ee7a m\u00f4i tr\u01b0\u1eddng.<\/p>\n

– Qu\u1ea7n x\u00e3 ph\u00e2n b\u1ed1 c\u00e1 th\u1ec3 theo chi\u1ec1u th\u1eb3ng \u0111\u1ee9ng. V\u00ed d\u1ee5:<\/p>\n

+ R\u1eebng m\u01b0a nhi\u1ec7t \u0111\u1edbi ph\u00e2n th\u00e0nh nhi\u1ec1u t\u1ea7ng, m\u1ed7i t\u1ea7ng c\u00e2y th\u00edch nghi v\u1edbi m\u1ee9c \u0111\u1ed9 chi\u1ebfu s\u00e1ng kh\u00e1c nhau trong qu\u1ea7n x\u00e3.<\/p>\n

+ Sinh v\u1eadt ph\u00e2n b\u1ed1 theo \u0111\u1ed9 s\u00e2u c\u1ee7a n\u01b0\u1edbc bi\u1ebfn, tu\u1ef3 thu\u1ed9c v\u00e0o nhu c\u1ea7u s\u1eed d\u1ee5ng \u00e1nh s\u00e1ng c\u1ee7a t\u1eebng lo\u00e0i.<\/p>\n

– Qu\u1ea7n x\u00e3 ph\u00e2n b\u1ed1 c\u00e1 th\u1ec3 theo chi\u1ec1u ngang. V\u00ed d\u1ee5:<\/p>\n

+ \u1ede qu\u1ea7n x\u00e3 bi\u1ec3n, v\u00f9ng g\u1ea7n b\u1edd th\u00e0nh ph\u1ea7n sinh v\u1eadt r\u1ea5t phong ph\u00fa, ra kh\u01a1i xa s\u1ed1 l\u01b0\u1ee3ng c\u00e1c lo\u00e0i \u00edt d\u1ea7n.<\/p>\n

+ Tr\u00ean \u0111\u1ea5t li\u1ec1n, th\u1ef1c v\u1eadt ph\u00e2n b\u1ed1 th\u00e0nh nh\u1eefng v\u00e0nh \u0111ai, theo \u0111\u1ed9 cao c\u1ee7a n\u1ec1n \u0111\u1ea5t.<\/p>\n

B\u00e0i 3 (trang 180 SGK Sinh h\u1ecdc 12):\u00a0N\u00eau s\u1ef1 kh\u00e1c nhau gi\u1eefa quan h\u1ec7 h\u1ed7 tr\u1ee3 v\u00e0 quan h\u1ec7 \u0111\u1ed1i kh\u00e1ng.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

S\u1ef1 kh\u00e1c nhau gi\u1eefa quan h\u1ec7 h\u1ed7 tr\u1ee3 v\u1edbi \u0111\u1ed1i kh\u00e1ng:<\/p>\n

Quan h\u1ec7 h\u1ed7 tr\u1ee3 g\u1ed3m c\u00f3: c\u1ed9ng sinh, h\u1ee3p t\u00e1c, h\u1ed9i sinh. C\u00e1c quan h\u1ec7 n\u00e0y \u0111em l\u1ea1i l\u1ee3i \u00edch ho\u1eb7c \u00edt nh\u00e2t kh\u00f4ng c\u00f3 h\u1ea1i cho c\u00e1c lo\u00e0i trong qu\u1ea7n x\u00e3. Ng\u01b0\u1ee3c l\u1ea1i trong quan h\u1ec7 \u0111\u1ed1i kh\u00e1ng (g\u1ed3m c\u00f3 c\u1ea1nh tranh, k\u00ed sinh, \u1ee9c ch\u1ebf c\u1ea3m nhi\u1ec5m, sinh v\u1eadt \u0103n th\u1ecbt sinh v\u1eadt kh\u00e1c) th\u00ec c\u00f3 m\u1ed9t lo\u00e0i c\u00f3 l\u1ee3i c\u00f2n b\u00ean kia l\u00e0 c\u00e1c lo\u00e0i b\u1ecb h\u1ea1i.<\/p>\n

B\u00e0i 4 (trang 180 SGK Sinh h\u1ecdc 12):\u00a0Trong c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c lo\u00e0i trong qu\u1ea7n x\u00e3, c\u00f3 lo\u00e0i c\u00f3 l\u1ee3i, c\u00f3 lo\u00e0i b\u1ecb h\u1ea1i. H\u00e3y x\u1ebfp theo th\u1ee9 t\u1ef1 t\u1eeb 1 cho t\u1edbi h\u1ebft c\u00e1c m\u1ed1i quan h\u1ec7 theo nguy\u00ean t\u1eafc sau:<\/strong><\/p>\n

– M\u1ed1i quan h\u1ec7 ch\u1ec9 c\u00f3 lo\u00e0i c\u00f3 l\u1ee3i x\u1ebfp tr\u01b0\u1edbc.<\/strong><\/p>\n

– M\u1ed1i quan h\u1ec7 c\u00f3 lo\u00e0i b\u1ecb h\u1ea1i x\u1ebfp sau, lo\u00e0i c\u00e0ng b\u1ecb h\u1ea1i nhi\u1ec1u c\u00e0ng x\u1ebfp v\u1ec1 sau.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

X\u1ebfp th\u1ee9 t\u1ef1 c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c lo\u00e0i sinh v\u1eadt::<\/p>\n

– C\u1ed9ng sinh, h\u1ee3p t\u00e1c, h\u1ed9i sinh, k\u00ed sinh, \u1ee9c ch\u1ebf- c\u1ea3m nhi\u1ec5m, c\u1ea1nh tranh, sinh v\u1eadt \u0103n sinh v\u1eadt kh\u00e1c.<\/p>\n

– S\u1ef1 s\u1eafp x\u1ebfp nh\u01b0 tr\u00ean c\u00f3 th\u1ec3 thay \u0111\u1ed5i trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t, v\u00ed d\u1ee5 trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p \u1ee9c ch\u1ebf – c\u1ea3m nhi\u1ec5m c\u00f3 th\u1ec3 \u0111\u1ee9ng tr\u01b0\u1edbc k\u00ed sinh.<\/p>\n

B\u00e0i 5 (trang 180 SGK Sinh h\u1ecdc 12):\u00a0Mu\u1ed1n trong m\u1ed9t ao nu\u00f4i \u0111\u01b0\u1ee3c nhi\u1ec1u lo\u00e0i c\u00e1 v\u00e0 cho n\u0103ng su\u1ea5t cao, ch\u00fang ta c\u1ea7n ch\u1ecdn nu\u00f4i c\u00e1c lo\u00e0i c\u00e1 nh\u01b0 th\u1ebf n\u00e0o?<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Mu\u1ed1n nu\u00f4i \u0111\u01b0\u1ee3c nhi\u1ec1u lo\u00e0i c\u00e1 trong m\u1ed9t ao v\u00e0 \u0111\u1ec3 c\u00f3 n\u0103ng su\u1ea5t cao th\u00ec ch\u00fang ta c\u1ea7n ch\u1ecdn nu\u00f4i c\u00e1c lo\u00e0i c\u00e1 ph\u00f9 h\u1ee3p. Nu\u00f4i c\u00e1 s\u1ed1ng \u1edf c\u00e1c t\u1ea7ng n\u01b0\u1edbc kh\u00e1c nhau: \u0103n n\u1ed5i, \u0103n \u0111\u00e1y,\u2026 v\u00e0 nu\u00f4i nhi\u1ec1u lo\u00e0i \u0103n c\u00e1c th\u1ee9c \u0103n kh\u00e1c nhau.<\/p>\n

– M\u1ed7i lo\u00e0i c\u00f3 m\u1ed9t \u1ed5 sinh th\u00e1i ri\u00eang n\u00ean l\u00e0m c\u00e1c lo\u00e0i c\u00e1 gi\u1ea3m m\u1ee9c \u0111\u1ed9 c\u1ea1nh tranh v\u1ec1 n\u01a1i \u1edf v\u00e0 th\u1ee9c \u0103n v\u1edbi nhau: c\u00e1 tr\u1eafm c\u1ecf \u0103n th\u1ef1c v\u1eadt v\u00e0 ph\u00e2n b\u1ed1 ch\u1ee7 y\u1ebfu \u1edf t\u1ea7ng n\u01b0\u1edbc m\u1eb7t, c\u00e1 m\u00e8 tr\u1eafng ch\u1ee7 y\u1ebfu \u0103n th\u1ef1c v\u1eadt n\u1ed5i, c\u00e1 m\u00e8 hoa \u0103n \u0111\u1ed9ng v\u1eadt n\u1ed5i l\u00e0 ch\u00ednh, c\u00e1 tr\u1eafm \u0111en \u0103n th\u00e2n m\u1ec1m v\u00e0 ph\u00e2n b\u1ed1 ch\u1ee7 y\u1ebfu \u1edf \u0111\u00e1y ao, c\u00e1 tr\u00f4i \u0103n t\u1ea1p v\u00e0 ch\u1ee7 y\u1ebfu \u0103n ch\u1ea5t h\u1eefu c\u01a1 v\u1ee5n n\u00e1t \u1edf \u0111\u00e1y ao, c\u00e1 ch\u00e9p \u0103n t\u1ea1p,\u2026<\/p>\n

– Nu\u00f4i nhi\u1ec1u lo\u00e0i c\u00e1 kh\u00e1c nhau nh\u01b0 th\u1ebf s\u1ebd t\u1eadn d\u1ee5ng \u0111\u01b0\u1ee3c ngu\u1ed3n th\u1ee9c \u0103n trong thi\u00ean nhi\u00ean v\u00e0 kh\u00f4ng gian v\u00f9ng n\u01b0\u1edbc, do \u0111\u00f3 \u0111\u1ea1t \u0111\u01b0\u1ee3c n\u0103ng su\u1ea5t cao.<\/p>\n

 <\/p>\n

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 <\/p>\n","protected":false},"excerpt":{"rendered":"

B\u00e0i 1 (trang 180 SGK Sinh h\u1ecdc 12):\u00a0Th\u1ebf n\u00e0o l\u00e0 m\u1ed9t qu\u1ea7n x\u00e3 sinh v\u1eadt? N\u00eau s\u1ef1 kh\u00e1c nhau gi\u1eefa qu\u1ea7n th\u1ec3 sinh v\u1eadt v\u00e0 qu\u1ea7n x\u00e3 sinh v\u1eadt. L\u1ea5y v\u00ed d\u1ee5 minh ho\u1ea1. L\u1eddi gi\u1ea3i: * Qu\u1ea7n x\u00e3 l\u00e0 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c qu\u1ea7n th\u1ec3 thu\u1ed9c nhi\u1ec1u lo\u00e0i kh\u00e1c nhau, c\u00f9ng s\u1ed1ng trong m\u1ed9t […]<\/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":"\nPh\u1ea7n B\u1ea3y - Ch\u01b0\u01a1ng 2 - B\u00e0i 40: Qu\u1ea7n x\u00e3 sinh v\u1eadt v\u00e0 m\u1ed9t s\u1ed1 \u0111\u1eb7c tr\u01b0ng c\u01a1 b\u1ea3n c\u1ee7a qu\u1ea7n x\u00e3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/phan-bay-chuong-2-bai-40-quan-xa-sinh-vat-va-mot-so-dac-trung-co-ban-cua-quan-xa\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ph\u1ea7n B\u1ea3y - Ch\u01b0\u01a1ng 2 - B\u00e0i 40: Qu\u1ea7n x\u00e3 sinh v\u1eadt v\u00e0 m\u1ed9t s\u1ed1 \u0111\u1eb7c tr\u01b0ng c\u01a1 b\u1ea3n c\u1ee7a qu\u1ea7n x\u00e3\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 180 SGK Sinh h\u1ecdc 12):\u00a0Th\u1ebf n\u00e0o l\u00e0 m\u1ed9t qu\u1ea7n x\u00e3 sinh v\u1eadt? 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