B\u00e0i 1 (trang 174 SGK Sinh h\u1ecdc 12):\u00a0Nguy\u00ean nh\u00e2n c\u1ee7a nh\u1eefng bi\u1ebfn \u0111\u1ed9ng s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 l\u00e0 g\u00ec?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Nguy\u00ean nh\u00e2n c\u1ee7a nh\u1eefng bi\u1ebfn \u0111\u1ed9ng s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3:<\/p>\n
– Do nh\u1eefng thay \u0111\u1ed5i c\u1ee7a nh\u1eefng nh\u00e2n t\u1ed1 sinh th\u00e1i v\u00f4 sinh c\u1ee7a m\u00f4i tr\u01b0\u1eddng (v\u00ed d\u1ee5 c\u00e1c nh\u00e2n t\u1ed1 sinh th\u00e1i kh\u00ed h\u1eadu, th\u1ed5 nh\u01b0\u1ee1ng,\u2026). Trong \u0111\u00f3, nh\u00e2n t\u1ed1 kh\u00ed h\u1eadu c\u00f3 \u1ea3nh h\u01b0\u1edfng th\u01b0\u1eddng xuy\u00ean v\u00e0 r\u00f5 r\u1ec7t nh\u1ea5t. Nhi\u1ec7t \u0111\u1ed9 qu\u00e1 th\u1ea5p th\u01b0\u1eddng g\u00e2y ch\u1ebft nhi\u1ec1u \u0111\u1ed9ng v\u1eadt.<\/p>\n
– Do thay \u0111\u1ed5i c\u1ee7a c\u00e1c nh\u00e2n t\u1ed1 sinh th\u00e1i trong qu\u1ea7n th\u1ec3 (v\u00ed d\u1ee5 nh\u00e2n t\u1ed1 sinh th\u00e1i c\u1ea1nh tranh gi\u1eefa c\u00e1c c\u00e1 th\u1ec3 trong c\u00f9ng m\u1ed9t \u0111\u00e0n, s\u1ed1 l\u01b0\u1ee3ng k\u1ebb th\u00f9 \u0103n th\u1ecbt\u2026).<\/p>\n
B\u00e0i 2 (trang 174 SGK Sinh h\u1ecdc 12):\u00a0Th\u1ebf n\u00e0o l\u00e0 nh\u00e2n t\u1ed1 sinh th\u00e1i ph\u1ee5 thu\u1ed9c m\u1eadt \u0111\u1ed9, nh\u00e2n t\u1ed1 kh\u00f4ng ph\u1ee5 thu\u1ed9c m\u1eadt \u0111\u1ed9? C\u00e1c nh\u00e2n t\u1ed1 n\u00e0y c\u00f3 \u1ea3nh h\u01b0\u1edfng nh\u01b0 th\u1ebf n\u00e0o t\u1edbi s\u1ef1 bi\u1ebfn \u0111\u1ed9ng s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
* C\u00e1c nh\u00e2n t\u1ed1 sinh th\u00e1i v\u00f4 sinh t\u00e1c \u0111\u1ed9ng tr\u1ef1c ti\u1ebfp v\u00e0 m\u1ed9t chi\u1ec1u l\u00ean sinh v\u1eadt m\u00e0 kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o m\u1eadt \u0111\u1ed9 c\u00e1 th\u1ec3 trong qu\u1ea7n th\u1ec3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 nh\u00e2n t\u1ed1 sinh th\u00e1i kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o m\u1eadt \u0111\u1ed9. C\u00e1c nh\u00e2n t\u1ed1 sinh th\u00e1i v\u00f4 sinh \u1ea3nh h\u01b0\u1edfng t\u1edbi tr\u1ea1ng th\u00e1i sinh l\u00ed c\u1ee7a c\u00e1c c\u00e1 th\u1ec3. S\u1ed1ng trong \u0111i\u1ec1u ki\u1ec7n t\u1ef1 nhi\u00ean kh\u00f4ng thu\u1eadn l\u1ee3i, m\u1ee9c sinh s\u1ea3n c\u1ee7a c\u00e1 th\u1ec3 gi\u1ea3m, kh\u1ea3 n\u0103ng th\u1ee5 tinh k\u00e9m, s\u1ee9c s\u1ed1ng c\u1ee7a con non th\u1ea5p\u2026<\/p>\n
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\u00a0 \u00a0 \u00a0 * C\u00e1c nh\u00e2n t\u1ed1 sinh th\u00e1i h\u1eefu sinh nh\u01b0 s\u1ef1 c\u1ea1nh tranh, m\u1ee9c sinh s\u1ea3n v\u00e0 m\u1ee9c \u0111\u1ed9 t\u1eed vong, s\u1ef1 ph\u00e1t t\u00e1n c\u1ee7a c\u00e1c c\u00e1 th\u1ec3 trong qu\u1ea7n th\u1ec3\u2026 b\u1ecb chi ph\u1ed1i b\u1edfi m\u1eadt \u0111\u1ed9 c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 nh\u00e2n t\u1ed1 sinh th\u00e1i ph\u1ee5 thu\u1ed9c v\u00e0o m\u1eadt \u0111\u1ed9. C\u00e1c nh\u00e2n t\u1ed1 h\u1eefu sinh \u1ea3nh h\u01b0\u1edfng r\u1ea5t l\u1edbn t\u1edbi kh\u1ea3 n\u0103ng t\u00ecm ki\u1ebfm th\u1ee9c \u0103n, n\u01a1i \u1edf, n\u01a1i \u0111\u1ebb tr\u1ee9ng, kh\u1ea3 n\u0103ng sinh s\u1ea3n v\u00e0 n\u1edf tr\u1ee9ng, kh\u1ea3 n\u0103ng s\u1ed1ng s\u00f3t c\u1ee7a con non\u2026 v\u00e0 do \u0111\u00f3 \u1ea3nh h\u01b0\u1edfng t\u1edbi s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 trong qu\u1ea7n th\u1ec3.<\/p>\n
B\u00e0i 3 (trang 174 SGK Sinh h\u1ecdc 12):\u00a0Nh\u1eefng nghi\u00ean c\u1ee9u v\u1ec1 bi\u1ebfn \u0111\u1ed9ng s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u00f3 \u00fd ngh\u0129a nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ed1i v\u1edbi s\u1ea3n xu\u1ea5t n\u00f4ng nghi\u1ec7p v\u00e0 b\u1ea3o v\u1ec7 c\u00e1c lo\u00e0i sinh v\u1eadt? Cho v\u00ed d\u1ee5 minh ho\u1ea1.<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Nh\u1eefng nghi\u00ean c\u1ee9u v\u1ec1 bi\u1ebfn \u0111\u1ed9ng s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u00f3 th\u1ec3 gi\u00fap c\u00e1c nh\u00e0 n\u00f4ng nghi\u1ec7p x\u00e1c \u0111\u1ecbnh \u0111\u00fang l\u1ecbch th\u1eddi v\u1ee5, \u0111\u1ec3 v\u1eadt nu\u00f4i, c\u00e2y tr\u1ed3ng sinh tr\u01b0\u1edfng trong \u0111i\u1ec1u ki\u1ec7n th\u00edch h\u1ee3p nh\u1ea5t trong n\u0103m, nh\u1eb1m \u0111\u1ea1t \u0111\u01b0\u1ee3c n\u0103ng su\u1ea5t cao. \u0110\u1ed3ng th\u1eddi gi\u00fap c\u00e1c nh\u00e0 b\u1ea3o v\u1ec7 m\u00f4i tr\u01b0\u1eddng ch\u1ee7 \u0111\u1ed9ng trong vi\u1ec7c h\u1ea1n ch\u1ebf s\u1ef1 ph\u00e1t tri\u1ec3n qu\u00e1 m\u1ee9c c\u1ee7a c\u00e1c lo\u00e0i sinh v\u1eadt g\u00e2y h\u1ea1i, g\u00e2y m\u1ea5t c\u00e2n b\u1eb1ng sinh th\u00e1i.<\/p>\n
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B\u00e0i 4 (trang 174 SGK Sinh h\u1ecdc 12):\u00a0Qu\u1ea7n th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 nh\u01b0 th\u1ebf n\u00e0o? Khi n\u00e0o qu\u1ea7n th\u1ec3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh v\u1ec1 m\u1ee9c c\u00e2n b\u1eb1ng?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
* \u0110i\u1ec1u ch\u1ec9nh s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3:<\/p>\n
– Trong \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng thu\u1eadn l\u1ee3i (m\u00f4i tr\u01b0\u1eddng c\u00f3 ngu\u1ed3n s\u1ed1ng d\u1ed3i d\u00e0o, \u00edt sinh v\u1eadt \u0103n th\u1ecbt\u2026) qu\u1ea7n th\u1ec3 t\u0103ng m\u1ee9c sinh s\u1ea3n, gi\u1ea3m m\u1ee9c \u0111\u1ed9 t\u1eed vong, nhi\u1ec1u c\u00e1 th\u1ec3 t\u1eeb n\u01a1i kh\u00e1c nh\u1eadp c\u01b0 t\u1edbi s\u1ed1ng trong qu\u1ea7n th\u1ec3\u2026 l\u00e0m cho s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 t\u0103ng l\u00ean nhanh ch\u00f3ng, \u0111\u00f4i khi v\u01b0\u1ee3t h\u01a1n h\u1eb3n m\u1ee9c \u0111\u1ed9 b\u00ecnh th\u01b0\u1eddng.<\/p>\n
– Khi s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 trong qu\u1ea7n th\u1ec3 t\u0103ng cao, sau m\u1ed9t th\u1eddi gian ngu\u1ed3n s\u1ed1ng tr\u1edf n\u00ean thi\u1ebfu h\u1ee5t, n\u01a1i s\u1ed1ng ch\u1eadt ch\u1ed9i,\u2026c\u1ea1nh tranh gay g\u1eaft l\u1ea1i di\u1ec5n ra l\u00e0m h\u1ea1n ch\u1ebf gia t\u0103ng s\u1ed1 c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3.<\/p>\n
* Qu\u1ea7n th\u1ec3 c\u00f3 kh\u1ea3 n\u0103ng t\u1ef1 \u0111i\u1ec1u ch\u1ec9nh s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 khi c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 gi\u1ea3m xu\u1ed1ng qu\u00e1 th\u1ea5p ho\u1eb7c t\u0103ng l\u00ean qu\u00e1 cao v\u1ec1 tr\u1ea1ng th\u00e1i c\u00e2n b\u1eb1ng. Tr\u1ea1ng th\u00e1i c\u00e2n b\u1eb1ng c\u1ee7a qu\u1ea7n th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c khi qu\u1ea7n th\u1ec3 c\u00f3 s\u1ed1 l\u01b0\u1ee3ng c\u00e1c c\u00e1 th\u1ec3 \u1ed5n \u0111\u1ecbnh v\u00e0 c\u00e2n b\u1eb1ng v\u1edbi kh\u1ea3 n\u0103ng cung c\u1ea5p ngu\u1ed3n s\u1ed1ng c\u1ee7a m\u00f4i tr\u01b0\u1eddng.<\/p>\n
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B\u00e0i 5 (trang 174 SGK Sinh h\u1ecdc 12):\u00a0V\u00ec sao n\u00f3i: trong t\u1ef1 nhi\u00ean, qu\u1ea7n th\u1ec3 sinh v\u1eadt c\u00f3 xu h\u01b0\u1edbng \u0111i\u1ec1u ch\u1ec9nh s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a m\u00ecnh \u1edf m\u1ee9c c\u00e2n b\u1eb1ng?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Trong t\u1ef1 nhi\u00ean, qu\u1ea7n th\u1ec3 lu\u00f4n c\u00f3 xu h\u01b0\u1edbng \u0111i\u1ec1u ch\u1ec9nh m\u1eadt \u0111\u1ed9 c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 \u1edf m\u1ee9c c\u00e2n b\u1eb1ng ph\u00f9 h\u1ee3p ngu\u1ed3n s\u1ed1ng c\u1ee7a m\u00f4i tr\u01b0\u1eddng.<\/p>\n
+ Khi s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 th\u1ea5p m\u00e0 \u0111i\u1ec1u ki\u1ec7n s\u1ed1ng c\u1ee7a m\u00f4i tr\u01b0\u1eddng thu\u1eadn l\u1ee3i (nh\u01b0 ngu\u1ed3n s\u1ed1ng d\u1ed3i d\u00e0o, kh\u00ed h\u1eadu ph\u00f9 h\u1ee3p\u2026) s\u1ed1 c\u00e1 th\u1ec3 m\u1edbi sinh ra t\u0103ng l\u00ean.<\/p>\n
+ Khi s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 t\u0103ng cao d\u1eabn t\u1edbi \u0111i\u1ec1u ki\u1ec7n s\u1ed1ng c\u1ee7a m\u00f4i tr\u01b0\u1eddng kh\u00f4ng thu\u1eadn l\u1ee3i d\u1eabn \u0111\u1ebfn c\u1ea1nh tranh l\u00e0m s\u1ed1 c\u00e1 th\u1ec3 b\u1ecb ch\u1ebft t\u0103ng l\u00ean.<\/p>\n
<\/p>\n<\/div>\n<\/div>\n<\/div>\n
<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
B\u00e0i 1 (trang 174 SGK Sinh h\u1ecdc 12):\u00a0Nguy\u00ean nh\u00e2n c\u1ee7a nh\u1eefng bi\u1ebfn \u0111\u1ed9ng s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 l\u00e0 g\u00ec? L\u1eddi gi\u1ea3i: Nguy\u00ean nh\u00e2n c\u1ee7a nh\u1eefng bi\u1ebfn \u0111\u1ed9ng s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3: – Do nh\u1eefng thay \u0111\u1ed5i c\u1ee7a nh\u1eefng nh\u00e2n t\u1ed1 sinh th\u00e1i v\u00f4 sinh c\u1ee7a m\u00f4i tr\u01b0\u1eddng (v\u00ed d\u1ee5 […]<\/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
Ph\u1ea7n B\u1ea3y - Ch\u01b0\u01a1ng 1 - B\u00e0i 39: Bi\u1ebfn \u0111\u1ed9ng s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 sinh v\u1eadt<\/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-1-bai-39-bien-dong-so-luong-ca-the-cua-quan-the-sinh-vat\/\" \/>\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 1 - B\u00e0i 39: Bi\u1ebfn \u0111\u1ed9ng s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 sinh v\u1eadt\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 174 SGK Sinh h\u1ecdc 12):\u00a0Nguy\u00ean nh\u00e2n c\u1ee7a nh\u1eefng bi\u1ebfn \u0111\u1ed9ng s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 c\u1ee7a qu\u1ea7n th\u1ec3 l\u00e0 g\u00ec? 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