B\u00e0i 2 (trang 165 SGK Sinh h\u1ecdc 12):\u00a0Qu\u1ea7n th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n chia th\u00e0nh c\u00e1c nh\u00f3m tu\u1ed5i kh\u00e1c nhau nh\u01b0 th\u1ebf n\u00e0o? Nh\u00f3m tu\u1ed5i c\u1ee7a qu\u1ea7n th\u1ec3 c\u00f3 thay \u0111\u1ed5i kh\u00f4ng v\u00e0 ph\u1ee5 thu\u1ed9c v\u00e0o nh\u1eefng nh\u00e2n t\u1ed1 n\u00e0o?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
C\u00e1c c\u00e1 th\u1ec3 trong qu\u1ea7n th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n chia th\u00e0nh c\u00e1c nh\u00f3m tu\u1ed5i: nh\u00f3m tu\u1ed5i tr\u01b0\u1edbc sinh s\u1ea3n, nh\u00f3m tu\u1ed5i sinh s\u1ea3n, nh\u00f3m tu\u1ed5i sau sinh s\u1ea3n. Ngo\u00e0i ra, ng\u01b0\u1eddi ta c\u00f2n ph\u00e2n chia c\u1ea5u tr\u00fac tu\u1ed5i th\u00e0nh tu\u1ed5i sinh l\u00ed, tu\u1ed5i sinh th\u00e1i v\u00e0 tu\u1ed5i qu\u1ea7n th\u1ec3.<\/p>\n
Qu\u1ea7n th\u1ec3 c\u00f3 c\u1ea5u tr\u00fac tu\u1ed5i \u0111\u1eb7c tr\u01b0ng, nh\u01b0ng c\u1ea5u tr\u00fac \u0111\u00f3 c\u0169ng lu\u00f4n thay \u0111\u1ed5i ph\u1ee5 thu\u1ed9c v\u00e0o \u0111i\u1ec1u ki\u1ec7n s\u1ed1ng c\u1ee7a m\u00f4i tr\u01b0\u1eddng.<\/p>\n
– Khi ngu\u1ed3n s\u1ed1ng t\u1eeb m\u00f4i tr\u01b0\u1eddng suy gi\u1ea3m, \u0111i\u1ec1u ki\u1ec7n kh\u00ed h\u1eadu x\u1ea5u \u0111i ho\u1eb7c d\u1ecbch b\u1ec7nh\u2026 c\u00e1c c\u00e1 th\u1ec3 non v\u00e0 gi\u00e0 b\u1ecb ch\u1ebft nhi\u1ec1u h\u01a1n c\u00e1 th\u1ec3 thu\u1ed9c nh\u00f3m tu\u1ed5i trung b\u00ecnh.<\/p>\n
– Trong \u0111i\u1ec1u ki\u1ec7n thu\u1eadn l\u1ee3i, ngu\u1ed3n th\u1ee9c \u0103n phong ph\u00fa, c\u00e1c con non l\u1edbn l\u00ean nhanh ch\u00f3ng, sinh s\u1ea3n t\u0103ng, t\u1eeb \u0111\u00f3 k\u00edch th\u00edch qu\u1ea7n th\u1ec3 t\u0103ng l\u00ean.<\/p>\n
Ngo\u00e0i ra, nh\u00f3m tu\u1ed5i c\u1ee7a qu\u1ea7n th\u1ec3 thay \u0111\u1ed5i c\u00f2n c\u00f3 th\u1ec3 ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 kh\u00e1c nhau nh\u01b0 m\u00f9a sinh s\u1ea3n, t\u1eadp t\u00ednh di c\u01b0\u2026<\/p>\n
B\u00e0i 3 (trang 165 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y n\u00eau c\u00e1c ki\u1ec3u ph\u00e2n b\u1ed1 c\u1ee7a qu\u1ea7n th\u1ec3 trong kh\u00f4ng gian, \u00fd ngh\u0129a sinh th\u00e1i c\u1ee7a c\u00e1c ki\u1ec3u ph\u00e2n b\u1ed1 \u0111\u00f3. L\u1ea5y v\u00ed d\u1ee5 minh ho\u1ea1.<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
– C\u00e1c ki\u1ec3u ph\u00e2n b\u1ed1 c\u1ee7a qu\u1ea7n th\u1ec3 trong kh\u00f4ng gian: theo nh\u00f3m, \u0111\u1ed3ng \u0111\u1ec1u ho\u1eb7c ng\u1eabu nhi\u00ean.<\/p>\n
– \u00dd ngh\u0129a sinh th\u00e1i:<\/p>\n
+ Ph\u00e2n b\u1ed1 theo nh\u00f3m: c\u00e1c c\u00e1 th\u1ec3 h\u1ed7 tr\u1ee3 l\u1eabn nhau ch\u1ed1ng l\u1ea1i \u0111i\u1ec1u ki\u1ec7n c\u1ee7a m\u00f4i tr\u01b0\u1eddng. V\u00ed d\u1ee5: \u0111\u00e0n tr\u00e2u r\u1eebng, b\u1ee5i c\u00e2y m\u1ecdc \u1edf sa m\u1ea1c\u2026<\/p>\n
+ Ph\u00e2n b\u1ed1 \u0111\u1ed3ng \u0111\u1ec1u: l\u00e0m gi\u1ea3m m\u1ee9c \u0111\u1ed9 c\u1ea1nh tranh gi\u1eefa c\u00e1c c\u00e1 th\u1ec3 trong qu\u1ea7n th\u1ec3. V\u00ed d\u1ee5: chim h\u1ea3i \u00e2u l\u00e0m t\u1ed5, c\u00e2y thong trong r\u1eebng th\u00f4ng\u2026<\/p>\n
+ Ph\u00e2n b\u1ed1 ng\u1eabu nhi\u00ean: sinh v\u1eadt t\u1eadn d\u1ee5ng \u0111\u01b0\u1ee3c ngu\u1ed3n s\u1ed1ng ti\u1ec1m t\u00e0ng trong m\u00f4i tr\u01b0\u1eddng. V\u00ed d\u1ee5: c\u00e1c lo\u00e0i c\u00e2y g\u1ed7 s\u1ed1ng trong r\u1eebng m\u01b0a nhi\u1ec7t \u0111\u1edbi\u2026<\/p>\n
B\u00e0i 4 (trang 165 SGK Sinh h\u1ecdc 12):\u00a0Th\u1ebf n\u00e0o l\u00e0 m\u1eadt \u0111\u1ed9 c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 ? M\u1eadt \u0111\u1ed9 c\u00e1 th\u1ec3 c\u00f3 \u1ea3nh h\u01b0\u1edfng t\u1edbi c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m sinh th\u00e1i kh\u00e1c c\u1ee7a qu\u1ea7n th\u1ec3 nh\u01b0 th\u1ebf n\u00e0o?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
– M\u1eadt \u0111\u1ed9 c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 l\u00e0 s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 s\u1ed1ng tr\u00ean m\u1ed9t \u0111\u01a1n v\u1ecb di\u1ec7n t\u00edch hay th\u1ec3 t\u00edch. V\u00ed d\u1ee5, m\u1eadt \u0111\u1ed9 c\u00e2y th\u00f4ng l\u00e0 1000 c\u00e2y\/ ha di\u1ec7n t\u00edch \u0111\u1ed3i, m\u1eadt \u0111\u1ed9 s\u00e2u ra l\u00e0 2 con\/m2<\/sup>\u00a0ru\u1ed9ng rau\u2026 M\u1eadt \u0111\u1ed9 c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 kh\u00f4ng c\u1ed1 \u0111\u1ecbnh m\u00e0 thay \u0111\u1ed5i theo m\u00f9a, n\u0103m hay \u0111i\u1ec1u ki\u1ec7n c\u1ee7a m\u00f4i tr\u01b0\u1eddng.<\/p>\n– M\u1eadt \u0111\u1ed9 l\u00e0 \u0111\u1eb7c tr\u01b0ng c\u01a1 b\u1ea3n c\u1ee7a qu\u1ea7n th\u1ec3 c\u00f3 \u1ea3nh h\u01b0\u1edfng t\u1edbi nhi\u1ec1u y\u1ebfu t\u1ed1 kh\u00e1c nhau nh\u01b0 m\u1ee9c \u0111\u1ed9 s\u1eed d\u1ee5ng ngu\u1ed3n s\u1ed1ng trong m\u00f4i tr\u01b0\u1eddng, t\u1edbi kh\u1ea3 n\u0103ng sinh s\u1ea3n v\u00e0 t\u1eed vong c\u1ee7a c\u00e1 th\u1ec3. Khi m\u1eadt \u0111\u1ed9 qu\u00e1 cao, c\u00e1c c\u00e1 th\u1ec3 s\u1ebd c\u1ea1nh tranh th\u1ee9c \u0103n, n\u01a1i \u1edf\u2026 d\u1eabn t\u1edbi t\u1ec9 l\u1ec7 t\u1eed vong cao. Khi m\u1eadt \u0111\u1ed9 gi\u1ea3m, th\u1ee9c \u0103n d\u1ed3i d\u00e0o, c\u00e1c c\u00e1 th\u1ec3 trong qu\u1ea7n th\u1ec3 t\u0103ng c\u01b0\u1eddng h\u1ed7 tr\u1ee3 nhau.<\/p>\n
B\u00e0i 5 (trang 165 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y ch\u1ecdn ph\u01b0\u01a1ng \u00e1n tr\u1ea3 l\u1eddi \u0111\u00fang.<\/strong><\/p>\nH\u00ecnh th\u1ee9c ph\u00e2n b\u1ed1 c\u00e1 th\u1ec3 \u0111\u1ed3ng \u0111\u1ec1u trong qu\u1ea7n th\u1ec3 c\u00f3 \u00fd ngh\u0129a sinh th\u00e1i g\u00ec?<\/strong><\/p>\na) C\u00e1c c\u00e1 th\u1ec3 h\u1ed7 tr\u1ee3 nhau ch\u1ed1ng ch\u1ecdi v\u1edbi \u0111i\u1ec1u ki\u1ec7n b\u1ea5t l\u1ee3i c\u1ee7a m\u00f4i tr\u01b0\u1eddng.<\/p>\n
b) C\u00e1c c\u00e1 th\u1ec3 t\u1eadn d\u1ee5ng \u0111\u01b0\u1ee3c nhi\u1ec1u ngu\u1ed3n s\u1ed1ng t\u1eeb m\u00f4i tr\u01b0\u1eddng.<\/p>\n
c) Gi\u1ea3m s\u1ef1 canh tr\u1ea1nh gay g\u1eaft gi\u1eefa c\u00e1c c\u00e1 th\u1ec3.<\/p>\n
d) C\u00e1c c\u00e1 th\u1ec3 c\u1ea1nh tranh nhau gay g\u1eaft gi\u00e0nh ngu\u1ed3n s\u1ed1ng.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
\u0110\u00e1p \u00e1n: c.<\/p>\n<\/div>\n<\/div>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
B\u00e0i 1 (trang 165 SGK Sinh h\u1ecdc 12):\u00a0S\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 t\u1ec9 l\u1ec7 gi\u1edbi t\u00ednh c\u1ee7a sinh v\u1eadt c\u00f3 \u00fd ngh\u0129a nh\u01b0 th\u1ebf n\u00e0o trong ch\u0103n nu\u00f4i v\u00e0 b\u1ea3o v\u1ec7 m\u00f4i tr\u01b0\u1eddng? L\u1eddi gi\u1ea3i: S\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 t\u1ec9 l\u1ec7 gi\u1edbi t\u00ednh c\u00f3 \u00fd ngh\u0129a quan tr\u1ecdng trong ch\u0103n nu\u00f4i gia s\u00fac, b\u1ea3o v\u1ec7 m\u00f4i […]<\/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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