Class 12 Biology Complete Notes Bundle, Study notes of Biology

This package contains complete Class 12 Biology notes designed for easy understanding, quick revision, and effective board exam preparation. The notes are well-structured, concise, and exam-focused, making them ideal for students who want to revise the full syllabus in less time. All important concepts are explained in a simple and clear manner, suitable for both beginners and last-minute study.

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2024/2025

Available from 04/23/2026

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(1) Aeexua! feproductton 1 151 Ge saked place without fuston of male —Only one ‘parent: fs fnvolved. = Pirtosts play_an fmportantk role- im Offaprings are exacHy fnflay fo thetic parents: ° Types of asexual eprodureon! 0) Pragmentation ey iS A _asexual: hype oF reproducrfor. bode break fato the Many pieces and each to nel Gtore As i a_nec individual: fr fa Spgrogy ra. ia qrow_a.s a_new mdtvrdita je Eg tt Yeast: : fe). ey Spore formatton:— - Jt f5 a aqsexural ype of repmduction Tein Hats type, Fhe motile Spores develop: trisfde yhe “parent body ja imatiertiy -t break hes pa rerr=ituael | and Afberabed Our and grow as a new tndividual: fq é Chlamydomonas (Unecelt lualay algae)» =a —— a depend opor the Lietbn ie —— oer in Zz He te the: cpumontiot quaestey ay a es : | . = J » | | | (3) IPtrero Ts fs I=) Are In Hssue culture I ropagatlon, a ha — Ly YOOr joe Lenk aed fg meristamatfc Hosue leaves etc) ft HCC Onda s under asep called as micro-; Ante: anne F¢ law ss star | wthat is Atte cous : SS rl a a ae eS fx \~——SCs—asas FA ao i ee eal a ——. | °° « 1 y *_| Plicwspo-ragiui a ic Fach ache _f. Fett spo qiake , usualy consis oF wo llanther lop ld tri ae - Fach lop consisy 6 Bae olen sac. NEE EEE q = In smmature stage , ne pollen sac con _of dtplord (20) " 4 {_mfcrospore mothe _ tad. «ma haploid Gy) A) mect mafcraspores spo rogenests-_ ax Untducteate | 7 From act microspores are: formed — Pe ey wing -Neous Fase on ao. Ture ue erat) tel | ener ee cell 9 ell stage pallen grain eer aan met re) ‘o rAverospor ere Tetrad oo ~ © © jAaploO 5 >xe Micros n Ene Polen sag a [Development of male gamebophyuke octuy ot twos llBerdre: rollénatton.20 oie pollen SCiC baidtrer pollfnatton on the soma. re pol |fratfon ‘tn! the pollen sac: Tn_tmmature sHO.ge , diplo c a IP Pic (2n) pnde rofcrospores- The dil (2 ¢ ° fs presente pr the pollen Sac. 2 [* dhru chute of anatropus ovule* Bicclaots| An_ovule which nas qn bend axt .|—lF ee diy (mf opfle). SSF Anatropus ovule consis} of main #0 parbs fe sha ql ——hbedey cn ip Stalks $f Stalk OF the ovule rs called as a Furntewr/as. Tt attach 40 the placertta_of- tre ovayy. ia Stalk hay Ing _raphae and. fh persiob frtko e uncon Is: f PWMVde 0 humans to othe sbadyalva4 Body : g tis lasal isrolern:portion presen acinar atl presen akithe po Le St The munfculus attach: +o the body at the basats pax ca Q Milum Seedy ot fllowtag paris’ EET AY Ot : : peal Bett retort vente * 7" ) €0f He DOA: taba ahead Ra tes com op, dc. ; & nevre}|us OES ea ae a allied a tae a Nalaza, pee za give rise ro the outer and fnner tf Te the owle having +40 fotequnent called — Tngequimertis are the provecting coyernfing: E Outer. Prtegumen’ gtve rise bo the testa oF the seed whfle frouner Intequenertt_g give rrse bo the #egmen of the seed » 4) Piicropyle : The inkequinectt leave a narrow passage at the tip of the “owule called aj a_rnfcropyle and se end Asi called fay 8! -mnfcropy a end: es =bunng fertflfzation, pollen ‘pee _enttr_fiato the -evete ermby SOC. ia 2 Lima AE AS: | ia Durfiag seed gercatnatton , afr dnd water enter {nko me [seed tor germination +hrough micropyle and afrer lgeeminatton; iottcle comeout Hirougin Fhe _micropyle- 6) Embryo sac? 190 n Tp constst of 7 celle. S nucleated: stterctiwre : : i Faq apparatus * vy et: lp its preserrh towards: the mfcropylar end. Toi comoraki of large eggs cell (rr) batt btu0 labera| Synerg{ds. ae Secondary eee fom )s Cit ts present ta the bee of the econo bac. TT omspsk of one celtwo nucleated shinee iter Cit fertilize topfhithe nidle gamers $0 form hrploidie (3, Anifpoda [ceil a rps tp 4 " (Ms am) present towards. tne: chalaza| ey or bes Shit Tp comstsh of hreerste libris _s/ ; . ike eta after feruiit sabton, = 2) 119) 1 | 1 me_glinnn a * *y Ae, Archesporial prime ~glnbshs birear hos ar «l P 2 i PET TS Bale i y)) (2n) meéqaspere Pimistl Sd mivetsmr /9¢ 7 oo ee aaa FS) as | me Sst Z yi i »——_.,/ | 9 a l ML | ; j \ TP qed = BPR cet am = 4% Pollfnation: ~ Deft» — The transftr_of pollen qiatn from _anther to the shigena_of P Same flower or another flower preset on the same plarck Jor different plané is_catled as 2_politnation. Types of politnatton® There are tun FL) pes: =poll tration: ve transfer_of pollen qrarq frorn_acibher to. the dtHqama | of same flower (bfsexual) or another flower present o same plant ts called oo _self-poll*nation, EP Self-politnatton are of twp Fypes : t mye La) Autoqamiy.: {> The transfer of pollen @raic from_aataer. ‘fo: bhewsth lof same flower. bisexua! ~) Jupresen on phe. same plant Is wit rolled a5 aquiogamy. : tes! spy : mill me Ege fean.: Senn Pipe Ny gt OF 112 0y0b “ton i Lei tales =" = we <== > =m = a a = mo r | __ a [Advantage of _pollrnatton fe 1-15 very easy , Sure method of pol linatfon- i = Tt fs vert tconomic because of less mastaqe. OF ener [Least wastage pf pollen gratm. nn smelt Tt marminia generic. stability: (purty) from genera f Ons Disadvantages eis IwlAK er. p to Hi Biter Self - pollfnatton, the proge volta d Sirk bs: : vety sere mice TH tel erono mic because of more wa More wastage of pollen drain. E It does not matntain generic srability. Agencies oF polifnarten: Agencies of polltnation — Abioric [ (Non-{fvig ) O_wi ee Othe, | S oe ee) ; ee ici. _(Entonoph } ( Reise ®& Brrds (oy aithophrl a eBel mott: ro) ) Bats _ (Chéroptero ini ) PENonGs _Crving ) [ Attotte . — AOE MO Phy jf i40 rine female Ptowert ~ Pollen grafns are produced large fr, ombex yligtrk In wel sormevtmnes wing Like shruchure Yo also present = - Starnen is versavtle and_expose_ anther. | an long, feathery ov harry. #0 etdp ne_pollen gral “ @_Hydropht ly [ (wlater_p2litnatfont ): T The transfer of pollen grown From anther +o bne srg loft “phe help of wa ber ts called as hydtrephilg: [Tike plants which are pollinated totttithe “help of water lated as ‘hydrophijvs: plant: Adapbatte 1 on ne Elenor are mostly urpsexual “Flowers are small and fnconsptceds. = flowers are colourless, wfhhout frag nance 2_hectorfes- 7 The pollen grafn and ; ake Floral a unwertable. se el tas ie. cover with mucilage- = Pollen gratns have specif gravity. 1 Tr Pollen grains are wfthout extne. Sigma fs long and sticky. i 2 Types of Hudrophitly © 1) Hypahydrophtly : (The pollenatfon occur below +he surface awfth help of fnsects fs called pprnereyee > The common finsects are ho nee bees (10% ~F0%} bettle, moths , ete. : 2 The plants which are pol|tnatcd with the help of frisecks Called _ (as a entormophilus Bich £9: Tasnne, rose, cesbrum, be botqamyvillea , SAI vid 4 CEC: I Adaptation : + Flowers are large fn size, ff they are sema)| trey are ldppear fn rhe form of infjorescenes- — Flowers are very abbractive , bright fa colour. Flowers having Q_ swery Fragnances and _nmecrpries- i [= Pollen qrafns fore sptny or rough. eXf fe. | = SHgma. (5 sticky | = few flowers develop a special —|ever T Q@ Ornethophtly (Berels pollfrarton )! F The bransfer “Of pollen grafns from anther $o stiqma : vith the help of bfrds ” called ornfrhophily- I+ The plartts twhich_are poll¢maree| twtth the help of btrds A a oratthephilos plant. Tfq: Bignonia, Bukca , Calitsbemon, bormbax ,ebe » +4 ____ Adaptation: : if Flowers are large » funnel shape or ee shape: pe The Floral parts are thick ancl Flesiny. A= Flowers are very bright _fn_colour- fs pailed as cheroptetopht lus plants. F Ig Manat nia the te Jhe branater of _pollen_qrat ore of S é ke | FE The plamts which are pollrnaked wPrh. 41 e 4 reg! Anthocephallus feadam:, kfgellta pinnate » Adar Ba uhfnta bee | Ada pn tfon: The flowers are large, short and. tt help to. hold bat — The flowers are blooming dureng 3 hight-bime, I> Flowers ernpis shrong rotten frote smelt F Flowers produces Bigeamenci © of ecporfe qrafn ond Fhey are dls0) edfble.. Di c Pollen qrainss ae SHickyys ro el Iv}