জীববিজ্ঞান ২য় পত্র (দ্বাদশ শ্রেণি)

wkLv e¨vbvRx©

cÖfvlK, cÖvwYweÁvb

evDdj miKvwi K‡jR

evDdj, cUzqvLvjx

mywcÖq wkÿv_x©iv,

AvR eje 2q ce©  Cnidaria kyiyi K_v cÖ_‡gB ce©wUi m¤^‡Ü wKQz †R‡b †bqv hvK|eQi K‡qK Av‡M ce©wUi Ab¨ GKwU bvg wQj- Coelenterata , Kvib G c‡e©i cÖvwY‡`i †`nMnei‡K  Coelenteron e‡j| wKš‘ Gi †P‡qI AwaK hyw³m½Z n‡q‡Q eZ©gv‡b cÖPwjZ bvgwU - Cnidaria | Kvib GKgvÎ G c‡e©i cÖvwY‡`iB wb‡WvmvBU bvgK we‡kl †Kvl i‡q‡Q,hv Ab¨ †Kvb c‡e© †`Lv hvqbv|  DwjøwLZ †KvlwUi ÿgZv †hgb A‡bK,‡Zgwb wewPÎI e‡U | †KvlwU wkKvi aiv,AvZ¥iÿv,Pjb BZ¨vw` bvbv Kv‡R cÖZ¨ÿ fywgKv iv‡L |

Avgiv †h †m›UgvwU©‡b Qz‡U hvB cÖevj Øxc ev cÖevj cÖvPxi †`L‡Z, †m¸‡jv GB c‡e©i cÖvwY‡`i ØvivB ˆZwi |  Rvb‡Z B‡”Q Ki‡Q †Zv wKfv‡e ˆZwi nq cÖevj Øxc?Avm‡j wbWvwiqv c‡e©i AwaKvsk cÖRvwZB wbðj Ges K‡jvbx-e× n‡q evm K‡i | Avi Gfv‡eB ax‡i ax‡i Øxc M‡o I‡V | G‡`i g‡a¨ wewPÎ eY©gqZv †`L‡Z cvIqv hvq e‡j G‡`i mgy‡`ªi dzj ejv nq |  wbWvwiqv cÖRvwZi 25% wbðj n‡q cÖevj cÖvPxi ev Øxc MVb K‡i |G‡`i wKQz cÖRvwZ gy³ , Giv cvwb‡Z mvuZvi †K‡U †eovq| †hgb †Rwj wdk--Aurelia  |gvÎ 20wU cÖRvwZ wgVv cvwbi evwm›`v,‡hgb --Hydra vulgaris

Gevi †R‡b †bqv hvK wbWvwiqv c‡e©i cÖavb ˆewkó¨ ¸‡jv--

(1) cÖ_g ce© A_v©r cwi‡div-i †P‡q Giv wKQzUv DbœZ| Giv wدÍix,A_v©r fªy‡YB G‡`i G‡±vWvg© I G‡ÛvWvg© bvgK `ywU ¯Íi MwVZ nq| D³ `ywU mÍi ‡_‡K wb:m„Z i‡m †Rwji gZ GKwU A‡Kvlxq ¯Íi MwVZ nq hv‡K †g‡mvwMøqv e‡j | cieZx©‡Z †g‡mvwMøqvB G‡` i wfw˯Íi wn‡m‡e `„pZv †`q |

(2) G‡`i wbw`„ó †Kvb g¯ÍK †bB,G c‡e©i cÖvwY‡`i †`‡ni A½ web¨vm Giƒc †h Aby‰`N¨© Aÿ eivei `yB‡qi AwaK Z‡j mgvb fv‡e fvM Kiv hvq| A_v©r Giv Aixq cÖwZmg |

(3) G‡`i ewn:Z¡‡K wb‡WvmvBU bv‡g we‡kl ai‡bi †Kvl i‡q‡Q,‡hwU m~ÎK-m¤^wjZ GKwU _wj-m`„k AsMvYy †bgv‡Uvwmó enb K‡i | AwaKvsk †bgv‡Uvwmó KvuUvhy³, ZvB G‡`i `skb AsMvbyI e‡j | Kwl©Kvq G‡`i Dcw¯’wZ †ewk jÿ¨ Kiv hvq |  †bgv‡Uvwm‡ói mvnv‡h¨ Giv AvZ¥iÿv, Pjb,Lv`¨MÖnb I †`n cwi¯‹vi ivLvi KvR K‡i |

(4) G‡ÛvWvwg©m cwi‡ewóZ †`nMneiwU GKwU gvÎ wQ`ªc‡_ evB‡i Db¥y³| A_v©r wQ`ªwU w`‡q †hgb cvwb,Lv`¨ I Aw·‡Rb cÖ‡ek K‡i,  †Zgwb Kve©b-WvB-A·vBW I AcvP¨ AskI evB‡i †ewi‡q hvq |  wQ`ªwU GKvav‡i gyL I cvqyi KvR K‡i | MneiwU‡K wm‡j‡›Uib ev M¨v‡÷vªfv¯‹zjvi Mnei ejv nq|

(5)G‡`i cwicvK c×wZ ewn:‡Kvlxq I AšÍ:‡Kvlxq | 

(6) Gc‡e©i wKQz cÖRvwZ eûiƒwcZv cÖ`k©b K‡i | †hgb wbðj cwjc,G‡`i A‡hŠb Rbb nq,Avi gy³Rxex †gWzmv –Giv †hŠb Rb‡b mÿg| G‡`i Rxeb `kvq Rby:µg †`Lv hvq |

(7) Giv eû‡Kvlx, †Kvlxq chv©q †_‡K GKavc GwM‡q Kjv-chv©‡qi msMVb gvÎvi cÖvYx‡Z cwibZ n‡q‡Q | wKš‘ †Kvb AsM ev Zš¿ MwVZ nqwb | wbWvwiqv c‡e©i wKQz D‡jøL‡hvM¨ cÖvYxi ˆeÁvwbK bvg †`qv nj---

1. Hydra vulgaris (wgVv cvwbi evwm›`v)
2. Aurelia aurita(‡Rwj wdk)
3. Gorgonia ventilina(mvMi cvLv)
4. Corallium rubrum (jvj cÖevj)

(5) Adamsia palliata(mvMi Kzmyg)

(6) Meandrina meandrites(‡Kvivj)

(7) Pennatula sulcata(mgy‡`ªi Kjg)

cÖkœgvjv---

(1) ‡g‡mvwMøqv wK?

(2 )wb‡WvmvBU †Kv‡li ˆewkó¨ wjL |

(3) `skb A½vby wK?

(4) cwjc I †gWzmv wK cÖ`k©b K‡i ?

(5) wbWvwiqv cwi‡div ce© †_‡K DbœZ ---e¨vL¨v Ki |