B\u00e0i 1 (trang 159 SGK Sinh h\u1ecdc 12):\u00a0Trong c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m sau, nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m n\u00e0o c\u00f3 th\u1ec3 c\u00f3 \u1edf m\u1ed9t qu\u1ea7n th\u1ec3 sinh v\u1eadt?<\/strong><\/p>\na) Qu\u1ea7n th\u1ec3 bao g\u1ed3m nhi\u1ec1u c\u00e1 th\u1ec3 sinh v\u1eadt.<\/p>\n
b) Qu\u1ea7n th\u1ec3 l\u00e0 t\u1eadp h\u1ee3p c\u1ee7a c\u00e1c c\u00e1 th\u1ec3 c\u00f9ng lo\u00e0i.<\/p>\n
c) C\u00e1c c\u00e1 th\u1ec3 trong qu\u1ea7n th\u1ec3 c\u00f3 kh\u1ea3 n\u0103ng giao ph\u1ed1i v\u1edbi nhau.<\/p>\n
d) Qu\u1ea7n th\u1ec3 g\u1ed3m nhi\u1ec1u c\u00e1 th\u1ec3 c\u00f9ng lo\u00e0i ph\u00e2n b\u1ed1 \u1edf c\u00e1c n\u01a1i xa nhau.<\/p>\n
e) C\u00e1c c\u00e1 th\u1ec3 trong qu\u1ea7n th\u1ec3 c\u00f3 ki\u1ec3u gen ho\u00e0n to\u00e0n gi\u1ed1ng nhau.<\/p>\n
g) Qu\u1ea7n th\u1ec3 c\u00f3 th\u1ec3 c\u00f3 khu v\u1ef1c ph\u00e2n b\u1ed1 r\u1ea5t r\u1ed9ng, gi\u1edbi h\u1ea1n b\u1edfi c\u00e1c ch\u01b0\u1edbng ng\u1ea1i c\u1ee7a thi\u00ean nhi\u00ean nh\u01b0 s\u00f4ng, n\u00fai, eo bi\u1ec3n\u2026<\/p>\n
h) Trong qu\u00e1 tr\u00ecnh h\u00ecnh th\u00e0nh qu\u1ea7n th\u1ec3, t\u1ea5t c\u1ea3 c\u00e1c c\u00e1 th\u1ec3 c\u00f9ng lo\u00e0i \u0111\u1ec1u th\u00edch nghi v\u1edbi m\u00f4i tr\u01b0\u1eddng m\u1edbi m\u00e0 ch\u00fang ph\u00e1t t\u00e1n t\u1edbi.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
\u0110\u00e1p \u00e1n: b, c, g, h.<\/p>\n
B\u00e0i 2 (trang 160 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y n\u00eau v\u00ed d\u1ee5 v\u1ec1 quan h\u1ec7 h\u1ed7 tr\u1ee3 v\u00e0 quan h\u1ec7 c\u1ea1nh tranh gi\u1eefa c\u00e1c c\u00e1 th\u1ec3 trong qu\u1ea7n th\u1ec3. T\u1ea1i sao n\u00f3i quan h\u1ec7 h\u1ed7 tr\u1ee3 v\u00e0 c\u1ea1nh tranh trong qu\u1ea7n th\u1ec3 l\u00e0 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m th\u00edch nghi c\u1ee7a sinh v\u1eadt v\u1edbi m\u00f4i tr\u01b0\u1eddng s\u1ed1ng, gi\u00fap cho qu\u1ea7n th\u1ec3 t\u1ed3n t\u1ea1i v\u00e0 ph\u00e1t tri\u1ec3n \u1ed5n \u0111\u1ecbnh?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
– V\u00ed d\u1ee5 v\u1ec1 quan h\u1ec7 h\u1ed7 tr\u1ee3 gi\u1eefa c\u00e1c c\u00e1 th\u1ec3 trong qu\u1ea7n th\u1ec3: h\u1ed7 tr\u1ee3 ki\u1ebfm th\u1ee9c \u0103n gi\u1eefa c\u00e1c c\u00e1 th\u1ec3 trong \u0111\u00e0n ki\u1ebfn, ong,\u2026 h\u1ed7 tr\u1ee3 nhau t\u00ecm \u0111\u01b0\u1eddng di c\u01b0 trong \u0111\u00e0n chim di c\u01b0\u2026<\/p>\n
– V\u00ed d\u1ee5 v\u1ec1 quan h\u1ec7 c\u1ea1nh tranh gi\u1eefa c\u00e1c c\u00e1 th\u1ec3 trong qu\u1ea7n th\u1ec3: c\u00e1c con h\u1ed5, b\u00e1o c\u1ea1nh tranh nhau gi\u00e0nh n\u01a1i \u1edf, k\u1ebft qu\u1ea3 d\u1eabn \u0111\u1ebfn h\u00ecnh th\u00e0nh khu v\u1ef1c sinh s\u1ed1ng (v\u00f9ng l\u00e3nh th\u1ed5) c\u1ee7a t\u1eebng c\u1eb7p h\u1ed5, b\u00e1o b\u1ed1 m\u1eb9. C\u00e1 m\u1eadp khi thi\u1ebfu th\u1ee9c \u0103n ch\u00fang c\u1ea1nh tranh v\u00e0 d\u1eabn t\u1edbi c\u00e1 l\u1edbn \u0103n th\u1ecbt c\u00e1 b\u00e9 (\u0103n th\u1ecbt ch\u00ednh \u0111\u1ed3ng lo\u1ea1i c\u1ee7a m\u00ecnh), c\u00e1 con n\u1edf ra tr\u01b0\u1edbc \u0103n ph\u00f4i non hay tr\u1ee9ng c\u00f2n ch\u01b0a n\u1edf.<\/p>\n
– Quan h\u1ec7 h\u1ed7 tr\u1ee3 hay c\u1ea1nh tranh trong qu\u1ea7n th\u1ec3 l\u00e0 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m th\u00edch nghi c\u1ee7a sinh v\u1eadt v\u1edbi m\u00f4i tr\u01b0\u1eddng s\u1ed1ng, \u0111\u1ea3m b\u1ea3o s\u1ef1 t\u1ed3n t\u1ea1i v\u00e0 ph\u00e1t tri\u1ec3n h\u01b0ng th\u1ecbnh:<\/p>\n
+ Quan h\u1ec7 h\u1ed7 tr\u1ee3 mang l\u1ea1i l\u1ee3i \u00edch cho c\u00e1c c\u00e1 th\u1ec3, c\u00e1c c\u00e1 th\u1ec3 khai th\u00e1c \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u ngu\u1ed3n s\u1ed1ng c\u1ee7a m\u00f4i tr\u01b0\u1eddng, c\u00e1c con non \u0111\u01b0\u1ee3c b\u1ed1 m\u1eb9 ch\u0103m s\u00f3c t\u1ed1t h\u01a1n, ch\u1ed1ng ch\u1ecdi v\u1edbi \u0111i\u1ec1u ki\u1ec7n b\u1ea5t l\u1ee3i c\u1ee7a t\u1ef1 nhi\u00ean v\u00e0 t\u1ef1 v\u1ec7 tr\u00e1nh k\u1ebb th\u00f9 t\u1ed1t h\u01a1n,\u2026 Nh\u1edd \u0111\u00f3 m\u00e0 kh\u1ea3 n\u0103ng s\u1ed1ng s\u00f3t v\u00e0 sinh s\u1ea3n c\u1ee7a c\u00e1c c\u00e1 th\u1ec3 t\u1ed1t h\u01a1n.<\/p>\n
+ Nh\u1edd c\u00f3 c\u1ea1nh tranh m\u00e0 m\u1eadt \u0111\u1ed9 qu\u1ea7n th\u1ec3 duy tr\u00ec \u1edf m\u1ee9c \u0111\u1ed9 ph\u00f9 h\u1ee3p gi\u00fap cho lo\u00e0i ph\u00e1t tri\u1ec3n \u1ed5n \u0111\u1ecbnh. C\u1ea1nh tranh gi\u1eefa c\u00e1c c\u00e1 th\u1ec3 d\u1eabn t\u1edbi s\u1ef1 th\u1eafng th\u1ebf c\u1ee7a c\u00e1c c\u00e1 th\u1ec3 kho\u1ebb v\u00e0 \u0111\u00e0o th\u00e0i c\u00e1c c\u00e1 th\u1ec3 y\u1ebfu, n\u00ean th\u00fac \u0111\u1ea9y qu\u00e1 tr\u00ecnh CLTN.<\/p>\n
B\u00e0i 3 (trang 160 SGK Sinh h\u1ecdc 12):\u00a0\u0110\u00e0n b\u00f2 r\u1eebng t\u1eadp trung nhau l\u1ea1i nh\u01b0 trong h\u00ecnh 36.5 bi\u1ec3u hi\u1ec7n m\u1ed1i quan h\u1ec7 n\u00e0o trong qu\u1ea7n th\u1ec3? L\u1ed1i s\u1ed1ng b\u1ea7y \u0111\u00e0n \u1edf \u0111\u1ed9ng v\u1eadt \u0111em l\u1ea1i cho qu\u1ea7n th\u1ec3 nh\u1eefng l\u1ee3i \u00edch g\u00ec?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/strong><\/p>\n– \u0110\u00e0n b\u00f2 r\u1eebng th\u01b0\u1eddng t\u1eadp trung l\u1ea1i th\u00e0nh \u0111\u00e1m \u0111\u00f4ng bi\u1ec3u hi\u1ec7n m\u1ed1i quan h\u1ec7 h\u1ed7 tr\u1ee3 trong qu\u1ea7n th\u1ec3, nh\u1edd \u0111\u00f3 b\u00f2 r\u1eebng c\u1ea3nh gi\u00e1c v\u00e0 ch\u1ed1ng l\u1ea1i k\u1ebb th\u00f9 r\u00ecnh r\u1eadp xung quanh.<\/p>\n
– L\u1ed1i s\u1ed1ng b\u1ea7y \u0111\u00e0n \u1edf \u0111\u1ed9ng v\u1eadt \u0111em l\u1ea1i cho qu\u1ea7n th\u1ec3 nh\u1eefng l\u1ee3i \u00edch:<\/p>\n
Vi\u1ec7c t\u00ecm m\u1ed3i, t\u00ecm n\u01a1i \u1edf v\u00e0 ch\u1ed1ng l\u1ea1i k\u1ebb th\u00f9 hi\u1ec7u qu\u1ea3 h\u01a1n. Chim ki\u1ebfm th\u1ee9c \u0103n theo \u0111\u00e0n d\u1ec5 t\u00ecm th\u1ea5y th\u1ee9c \u0103n h\u01a1n khi \u0111i ri\u00eang r\u1ebd, c\u00e1c con trong \u0111\u00e0n r\u1ee7 nhau t\u00ecm m\u1ed3i, b\u00e1o hi\u1ec7u cho nhau n\u01a1i c\u00f3 nhi\u1ec1u th\u1ee9c \u0103n, th\u00f4ng b\u00e1o cho nhau k\u1ebb th\u00f9 s\u1eafp t\u1edbi, n\u01a1i c\u00f3 lu\u1ed3ng gi\u00f3 tr\u00e1i ho\u1eb7c n\u01a1i tr\u00fa \u1ea9n thu\u1eadn ti\u1ec7n.<\/p>\n
Ngo\u00e0i ra, s\u1ed1ng trong b\u1ea7y \u0111\u00e0n kh\u1ea3 n\u0103ng t\u00ecm g\u1eb7p nhau c\u1ee7a con \u0111\u1ef1c v\u00e0 con c\u00e1i d\u1ec5 d\u00e0ng h\u01a1n, \u0111\u1ea3m b\u1ea3o cho s\u1ef1 sinh s\u1ea3n thu\u1eadn l\u1ee3i.<\/p>\n
Trong m\u1ed9t s\u1ed1 \u0111\u00e0n c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng ph\u00e2n chia \u0111\u1eb3ng c\u1ea5p, nh\u1eefng c\u00e1 th\u1ec3 thu\u1ed9c \u0111\u1eb3ng c\u1ea5p tr\u00ean (nh\u01b0 con \u0111\u1ea7u \u0111\u00e0n) lu\u00f4n chi\u1ebfm \u01b0u th\u1ebf v\u00e0 nh\u1eefng c\u00e1 th\u1ec3 thu\u1ed9c \u0111\u1eb3ng c\u1ea5p d\u01b0\u1edbi lu\u00f4n l\u00e9p v\u1ebf, s\u1ef1 ph\u00e2n chia n\u00e0y gi\u00fap cho c\u00e1c c\u00e1 th\u1ec3 trong \u0111\u00e0n nh\u01b0\u1eddng nh\u1ecbn nhau, tr\u00e1nh \u1ea9u \u0111\u1ea3 g\u00e2y th\u01b0\u01a1ng t\u00edch. S\u1ef1 ch\u1ec9 huy c\u1ee7a con \u0111\u1ea7u \u0111\u00e0n c\u00f2n gi\u00fap c\u1ea3 \u0111\u00e0n c\u00f3 t\u00ednh t\u1ed5 ch\u1ee9c v\u00e0 v\u00ec v\u1eady th\u00eam ph\u1ea7n s\u1ee9c m\u1ea1nh ch\u1ed1ng l\u1ea1i k\u1ebb th\u00f9, nh\u1eefng con non \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 t\u1ed1t h\u01a1n.<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
B\u00e0i 1 (trang 159 SGK Sinh h\u1ecdc 12):\u00a0Trong c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m sau, nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m n\u00e0o c\u00f3 th\u1ec3 c\u00f3 \u1edf m\u1ed9t qu\u1ea7n th\u1ec3 sinh v\u1eadt? a) Qu\u1ea7n th\u1ec3 bao g\u1ed3m nhi\u1ec1u c\u00e1 th\u1ec3 sinh v\u1eadt. b) Qu\u1ea7n th\u1ec3 l\u00e0 t\u1eadp h\u1ee3p c\u1ee7a c\u00e1c c\u00e1 th\u1ec3 c\u00f9ng lo\u00e0i. c) C\u00e1c c\u00e1 th\u1ec3 trong qu\u1ea7n th\u1ec3 c\u00f3 […]<\/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
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