{"id":5842,"date":"2026-06-06T07:30:14","date_gmt":"2026-06-06T07:30:14","guid":{"rendered":"https:\/\/ksquareinstitute.in\/blog\/?p=5842"},"modified":"2026-06-06T07:30:15","modified_gmt":"2026-06-06T07:30:15","slug":"re-neet-2026-biology-quick-revision","status":"publish","type":"post","link":"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-biology-quick-revision\/","title":{"rendered":"Re-NEET 2026 Biology Quick Revision: 100 Must-Know NCERT Lines for June 21"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"432\" src=\"https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Biology-Quick-Revision-\u2014-100-Must-Know-NCERT-Lines-1024x432.jpg\" alt=\"Re-NEET 2026 Biology quick revision NCERT lines from Class 11 and 12 for June 21 exam preparation\" class=\"wp-image-5843\" srcset=\"https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Biology-Quick-Revision-\u2014-100-Must-Know-NCERT-Lines-1024x432.jpg 1024w, https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Biology-Quick-Revision-\u2014-100-Must-Know-NCERT-Lines-300x127.jpg 300w, https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Biology-Quick-Revision-\u2014-100-Must-Know-NCERT-Lines-768x324.jpg 768w, https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Biology-Quick-Revision-\u2014-100-Must-Know-NCERT-Lines-1536x648.jpg 1536w, https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/06\/Re-NEET-2026-Biology-Quick-Revision-\u2014-100-Must-Know-NCERT-Lines.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>If you open your NCERT textbook right now, you&#8217;ll find over 600 pages of Biology content. But for <strong>Re-NEET 2026 Biology quick revision<\/strong>, you don&#8217;t need all of it. You need the 100 lines that NTA has pulled questions from, year after year after year.<\/p>\n\n\n\n<p>This list is drawn directly from Class 11 and Class 12 NCERT Biology \u2014 structured to complement your <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-19-day-plan\">Re-NEET 2026 19-day plan<\/a> \u2014 no outside sources, no guesswork. These are the NEET Biology NCERT important lines \u2014 every single one has appeared in NEET at least once in the last 5 years. Read slowly, revise daily, and revise again on June 20. This is your Re-NEET 2026 Biology last minute revision tool \u2014 use it consistently.<\/p>\n\n\n\n<p>Before you start, make sure you&#8217;ve also locked in your <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-biology-last-15-days-revision\">Biology last 15 days plan<\/a> chapter priorities alongside these lines.<\/p>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table of Contents<\/h2><nav><ul><li><a href=\"#class-11-ncert-biology-50-re-neet-2026-biology-quick-revision-lines\">Class 11 NCERT Biology \u2014 50 Re-NEET 2026 Biology Quick Revision Lines<\/a><ul><li><a href=\"#the-living-world-biological-classification\">The Living World &amp; Biological Classification<\/a><\/li><li><a href=\"#plant-kingdom\">Plant Kingdom<\/a><\/li><li><a href=\"#morphology-of-flowering-plants\">Morphology of Flowering Plants<\/a><\/li><li><a href=\"#anatomy-of-flowering-plants\">Anatomy of Flowering Plants<\/a><\/li><li><a href=\"#cell-biology\">Cell Biology<\/a><\/li><li><a href=\"#biomolecules-enzymes\">Biomolecules &amp; Enzymes<\/a><\/li><\/ul><\/li><li><a href=\"#class-12-ncert-biology-50-more-re-neet-2026-biology-quick-revision-lines\">Class 12 NCERT Biology \u2014 50 More Re-NEET 2026 Biology Quick Revision Lines<\/a><ul><li><a href=\"#reproduction-in-organisms\">Reproduction in Organisms<\/a><\/li><li><a href=\"#sexual-reproduction-in-flowering-plants\">Sexual Reproduction in Flowering Plants<\/a><\/li><li><a href=\"#human-reproduction\">Human Reproduction<\/a><\/li><li><a href=\"#reproductive-health\">Reproductive Health<\/a><\/li><li><a href=\"#genetics-evolution\">Genetics &amp; Evolution<\/a><\/li><li><a href=\"#biology-in-human-welfare\">Biology in Human Welfare<\/a><\/li><li><a href=\"#biotechnology\">Biotechnology<\/a><\/li><\/ul><\/li><li><a href=\"#how-to-use-this-re-neet-2026-biology-quick-revision-list-effectively\">How to Use This Re-NEET 2026 Biology Quick Revision List Effectively<\/a><\/li><li><a href=\"#faq-section\">FAQ Section<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"class-11-ncert-biology-50-re-neet-2026-biology-quick-revision-lines\">Class 11 NCERT Biology \u2014 50 Re-NEET 2026 Biology Quick Revision Lines<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"the-living-world-biological-classification\">The Living World &amp; Biological Classification<\/h3>\n\n\n\n<p>This section of the Re-NEET 2026 Biology quick revision list targets the most directly-tested NCERT lines from Class 11 Chapters 1 and 2.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Taxonomy is the science of identification, nomenclature, and classification of organisms.<\/li>\n\n\n\n<li>The basic unit of classification is <strong>species<\/strong>.<\/li>\n\n\n\n<li>Binomial nomenclature was introduced by <strong>Carolus Linnaeus<\/strong>.<\/li>\n\n\n\n<li>In binomial nomenclature, the generic name starts with a capital letter; the species epithet starts with a small letter.<\/li>\n\n\n\n<li>Whittaker (1969) proposed the <strong>Five Kingdom Classification<\/strong>: Monera, Protista, Fungi, Plantae, Animalia.<\/li>\n\n\n\n<li>Bacteria are the most abundant microorganisms on Earth.<\/li>\n\n\n\n<li>Cyanobacteria (blue-green algae) are photosynthetic prokaryotes.<\/li>\n\n\n\n<li>Viruses are <strong>non-cellular<\/strong>, containing either DNA or RNA, never both.<\/li>\n\n\n\n<li>Viroids are infectious RNA molecules without a protein coat \u2014 they cause plant diseases.<\/li>\n\n\n\n<li>Lichens are <strong>symbiotic associations<\/strong> between algae and fungi.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"plant-kingdom\">Plant Kingdom<\/h3>\n\n\n\n<p>For Re-NEET 2026 Biology quick revision, the plant kingdom lines below are the ones NTA pulls options from most directly.<\/p>\n\n\n\n<ol start=\"11\" class=\"wp-block-list\">\n<li>Algae are <strong>thallophytes<\/strong> \u2014 they lack well-differentiated plant body, vascular tissue, and embryo.<\/li>\n\n\n\n<li>Bryophytes are called <strong>amphibians of the plant kingdom<\/strong> \u2014 they need water for sexual reproduction.<\/li>\n\n\n\n<li>The plant body in bryophytes is the <strong>gametophyte<\/strong> (haploid); the sporophyte is dependent on it.<\/li>\n\n\n\n<li>Pteridophytes are the first vascular plants; they have true roots, stems, and leaves.<\/li>\n\n\n\n<li>In <strong>gymnosperms<\/strong>, seeds are naked (not enclosed in a fruit).<\/li>\n\n\n\n<li><strong>Angiosperms<\/strong> have seeds enclosed within a fruit \u2014 they are the most evolved plant group.<\/li>\n\n\n\n<li>Monocots have one cotyledon; dicots have two cotyledons.<\/li>\n\n\n\n<li>Alternation of generations refers to the alternation between the haploid gametophyte and diploid sporophyte phases.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"morphology-of-flowering-plants\">Morphology of Flowering Plants<\/h3>\n\n\n\n<ol start=\"19\" class=\"wp-block-list\">\n<li>The <strong>root<\/strong> is the underground part that absorbs water and minerals; it shows <strong>positive geotropism<\/strong>.<\/li>\n\n\n\n<li>A <strong>tap root system<\/strong> arises from the radicle; a <strong>fibrous root system<\/strong> replaces the primary root in monocots.<\/li>\n\n\n\n<li>The <strong>stem<\/strong> is the ascending axis of the plant with nodes and internodes.<\/li>\n\n\n\n<li>A leaf with a <strong>single lamina<\/strong> is simple; a leaf with a lamina divided into leaflets is compound.<\/li>\n\n\n\n<li><strong>Racemose inflorescence<\/strong>: main axis continues to grow; flowers are borne laterally in acropetal order.<\/li>\n\n\n\n<li>A <strong>fruit<\/strong> develops from the ovary after fertilisation; a <strong>false fruit<\/strong> (pseudocarp) develops from parts other than ovary (e.g., apple from thalamus).<\/li>\n\n\n\n<li>The flower is the <strong>reproductive unit<\/strong> in angiosperms.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"anatomy-of-flowering-plants\">Anatomy of Flowering Plants<\/h3>\n\n\n\n<ol start=\"26\" class=\"wp-block-list\">\n<li><strong>Meristematic tissue<\/strong> consists of cells that actively divide; it is responsible for growth.<\/li>\n\n\n\n<li><strong>Permanent tissue<\/strong> consists of cells that have lost the capacity to divide \u2014 they are differentiated.<\/li>\n\n\n\n<li><strong>Parenchyma<\/strong> cells are living, thin-walled, and perform storage and photosynthesis.<\/li>\n\n\n\n<li><strong>Collenchyma<\/strong> cells have unevenly thickened walls \u2014 they provide mechanical support with flexibility.<\/li>\n\n\n\n<li><strong>Sclerenchyma<\/strong> cells have uniformly thick, lignified walls \u2014 they are dead at maturity and provide rigidity.<\/li>\n\n\n\n<li><strong>Xylem<\/strong> conducts water and minerals; <strong>phloem<\/strong> conducts food (primarily sucrose).<\/li>\n\n\n\n<li>The <strong>vascular bundle<\/strong> in dicot stems is open (has cambium); in monocot stems it is closed (no cambium).<\/li>\n<\/ol>\n\n\n\n<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n<meta charset=\"UTF-8\" \/>\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" \/>\n<title>Brahmastra RE-NEET Banners<\/title>\n<style>\n  #ksq2-root {\n    all: initial;\n    display: block;\n    box-sizing: border-box;\n    width: 100%;\n  }\n  #ksq2-root *,\n  #ksq2-root *::before,\n  #ksq2-root *::after {\n    box-sizing: border-box;\n    margin: 0;\n    padding: 0;\n  }\n  #ksq2-root .ksq2-wrap {\n    position: relative;\n    width: 100%;\n    max-width: 900px;\n    margin: 0 auto;\n    overflow: hidden;\n    border-radius: 14px;\n    background: #111;\n  }\n  #ksq2-root .ksq2-slides {\n    display: flex;\n    transition: transform 0.55s cubic-bezier(.4,0,.2,1);\n    will-change: transform;\n  }\n  #ksq2-root .ksq2-slide {\n    min-width: 100%;\n    display: block;\n    position: relative;\n  }\n  #ksq2-root .ksq2-slide a {\n    display: block;\n    text-decoration: none;\n  }\n  #ksq2-root .ksq2-slide img {\n    width: 100%;\n    display: block;\n    height: auto;\n    border: none;\n    outline: none;\n  }\n  #ksq2-root .ksq2-progress {\n    position: absolute;\n    bottom: 0;\n    left: 0;\n    height: 3px;\n    background: rgba(255,255,255,0.9);\n    width: 0%;\n    border-radius: 0 2px 2px 0;\n    pointer-events: none;\n  }\n  #ksq2-root .ksq2-nav {\n    position: absolute;\n    top: 50%;\n    transform: translateY(-50%);\n    background: rgba(255,255,255,0.15);\n    border: 1px solid rgba(255,255,255,0.2);\n    color: #fff;\n    width: 40px;\n    height: 40px;\n    border-radius: 50%;\n    cursor: pointer;\n    display: flex;\n    align-items: center;\n    justify-content: center;\n    font-size: 22px;\n    line-height: 1;\n    transition: background 0.2s;\n    z-index: 2;\n    font-family: sans-serif;\n    padding: 0;\n    outline: none;\n  }\n  #ksq2-root .ksq2-nav:hover { background: rgba(255,255,255,0.3); 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return; }\n    rafId = requestAnimationFrame(tick);\n  }\n\n  document.querySelector('#ksq2Wrap .ksq2-prev').addEventListener('click', function () { goTo(current - 1); });\n  document.querySelector('#ksq2Wrap .ksq2-next').addEventListener('click', function () { goTo(current + 1); });\n  dots.forEach(function (d, i) { d.addEventListener('click', function () { goTo(i); }); });\n\n  wrapEl.addEventListener('mouseenter', function () {\n    paused = true;\n    cancelAnimationFrame(rafId);\n  });\n  wrapEl.addEventListener('mouseleave', function () {\n    paused = false;\n    var elapsed = parseFloat(progressEl.style.width) \/ 100 * duration;\n    startTime = null;\n    rafId = requestAnimationFrame(function (ts) {\n      startTime = ts - elapsed;\n      tick(ts);\n    });\n  });\n\n  rafId = requestAnimationFrame(tick);\n})();\n<\/script>\n\n<\/body>\n<\/html>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"cell-biology\">Cell Biology<\/h3>\n\n\n\n<p>Cell biology is a high-yield zone in any Re-NEET 2026 Biology quick revision session \u2014 expect 4\u20136 direct questions.<\/p>\n\n\n\n<ol start=\"33\" class=\"wp-block-list\">\n<li>The <strong>cell theory<\/strong> states: (1) all living organisms are made of cells, (2) the cell is the basic structural and functional unit, (3) all cells arise from pre-existing cells.<\/li>\n\n\n\n<li>Prokaryotic cells lack a membrane-bound nucleus and membrane-bound organelles.<\/li>\n\n\n\n<li>The <strong>plasma membrane<\/strong> is selectively permeable \u2014 it regulates entry and exit of substances.<\/li>\n\n\n\n<li>The <strong>fluid mosaic model<\/strong> (Singer and Nicolson, 1972) describes the plasma membrane as a bilayer of phospholipids with embedded proteins.<\/li>\n\n\n\n<li><strong>Osmosis<\/strong> is the diffusion of water across a semi-permeable membrane from higher to lower water potential.<\/li>\n\n\n\n<li>The <strong>nucleus<\/strong> is the control centre of the cell; it contains the DNA (genetic material).<\/li>\n\n\n\n<li><strong>Mitochondria<\/strong> are the sites of aerobic respiration \u2014 they are called the <strong>powerhouse of the cell<\/strong>.<\/li>\n\n\n\n<li><strong>Chloroplasts<\/strong> are the sites of photosynthesis; they contain the green pigment <strong>chlorophyll<\/strong>.<\/li>\n\n\n\n<li><strong>Ribosomes<\/strong> are the sites of protein synthesis (translation).<\/li>\n\n\n\n<li>The <strong>Golgi apparatus<\/strong> (Golgi body) is involved in packaging, processing, and transport of proteins.<\/li>\n\n\n\n<li><strong>Lysosomes<\/strong> contain hydrolytic enzymes \u2014 they are called the <strong>suicidal bags of the cell<\/strong>.<\/li>\n\n\n\n<li><strong>Centrosomes<\/strong> are found only in animal cells and lower plants \u2014 they form the <strong>spindle fibres<\/strong> during cell division.<\/li>\n\n\n\n<li><strong>Meiosis I<\/strong> is the <strong>reductional division<\/strong> (chromosome number halves); <strong>Meiosis II<\/strong> is the <strong>equational division<\/strong>.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"biomolecules-enzymes\">Biomolecules &amp; Enzymes<\/h3>\n\n\n\n<ol start=\"46\" class=\"wp-block-list\">\n<li><strong>Carbohydrates<\/strong> are the primary source of energy; they are made of C, H, and O in the ratio 1:2:1.<\/li>\n\n\n\n<li>The most abundant organic compound on Earth is <strong>cellulose<\/strong>.<\/li>\n\n\n\n<li>Fats are <strong>esters of glycerol and fatty acids<\/strong> \u2014 they yield more energy per gram than carbohydrates.<\/li>\n\n\n\n<li><strong>Enzymes<\/strong> are biological catalysts \u2014 they are mostly proteins (except ribozymes, which are RNA).<\/li>\n\n\n\n<li>The <strong>active site<\/strong> of an enzyme is the specific region where the substrate binds.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"class-12-ncert-biology-50-more-re-neet-2026-biology-quick-revision-lines\">Class 12 NCERT Biology \u2014 50 More Re-NEET 2026 Biology Quick Revision Lines<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"reproduction-in-organisms\">Reproduction in Organisms<\/h3>\n\n\n\n<ol start=\"51\" class=\"wp-block-list\">\n<li><strong>Vegetative propagation<\/strong> is a form of asexual reproduction in plants \u2014 runners, rhizomes, and bulbs are examples.<\/li>\n\n\n\n<li><strong>Sporulation<\/strong> (spore formation) is the most common asexual reproduction method in fungi and lower plants.<\/li>\n\n\n\n<li>In <strong>sexual reproduction<\/strong>, gametes fuse to form a <strong>zygote<\/strong> \u2014 it introduces genetic variation.<\/li>\n\n\n\n<li><strong>Syngamy<\/strong> is the fusion of male and female gametes; <strong>triple fusion<\/strong> is unique to angiosperms.<\/li>\n\n\n\n<li>In humans, <strong>spermatogenesis<\/strong> produces four haploid spermatozoa from one spermatogonium; <strong>oogenesis<\/strong> produces one egg and three polar bodies.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"sexual-reproduction-in-flowering-plants\">Sexual Reproduction in Flowering Plants<\/h3>\n\n\n\n<ol start=\"56\" class=\"wp-block-list\">\n<li>The <strong>anther<\/strong> produces pollen grains (male gametophyte); the <strong>ovary<\/strong> contains ovules with the female gametophyte (embryo sac).<\/li>\n\n\n\n<li><strong>Pollination<\/strong> is the transfer of pollen from the anther to the stigma.<\/li>\n\n\n\n<li><strong>Self-pollination<\/strong> (autogamy) occurs within the same flower or plant; <strong>cross-pollination<\/strong> (allogamy) occurs between different plants.<\/li>\n\n\n\n<li><strong>Double fertilisation<\/strong> is unique to angiosperms: one sperm fuses with the egg (syngamy \u2192 zygote), another fuses with the two polar nuclei (triple fusion \u2192 primary endosperm nucleus \u2192 3n).<\/li>\n\n\n\n<li>The <strong>endosperm<\/strong> (formed from triple fusion) provides nutrition to the developing embryo.<\/li>\n\n\n\n<li>The <strong>seed<\/strong> develops from the ovule; the <strong>fruit<\/strong> develops from the ovary.<\/li>\n\n\n\n<li>Parthenocarpy is the development of fruit <strong>without fertilisation<\/strong> \u2014 e.g., banana.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"human-reproduction\">Human Reproduction<\/h3>\n\n\n\n<ol start=\"63\" class=\"wp-block-list\">\n<li>The <strong>testes<\/strong> are located in the <strong>scrotum<\/strong> \u2014 outside the abdominal cavity \u2014 because spermatogenesis requires a temperature 2\u20132.5\u00b0C lower than body temperature.<\/li>\n\n\n\n<li>The <strong>acrosome<\/strong> of the sperm head contains enzymes that help penetrate the egg during fertilisation.<\/li>\n\n\n\n<li><strong>Fertilisation<\/strong> in humans occurs in the <strong>fallopian tube<\/strong> (ampullary-isthmic junction).<\/li>\n\n\n\n<li>The <strong>implantation<\/strong> of the blastocyst occurs in the <strong>uterine wall (endometrium)<\/strong> \u2014 approximately 7 days after fertilisation.<\/li>\n\n\n\n<li><strong>hCG<\/strong> (human Chorionic Gonadotropin) is secreted by the trophoblast \u2014 it maintains the corpus luteum during early pregnancy. It is the basis of pregnancy tests.<\/li>\n\n\n\n<li>The normal gestation period in humans is <strong>9 months (approximately 280 days)<\/strong>.<\/li>\n\n\n\n<li><strong>Parturition<\/strong> (childbirth) is triggered by a complex hormonal interplay \u2014 <strong>oxytocin<\/strong> plays the key role in uterine contractions.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"reproductive-health\">Reproductive Health<\/h3>\n\n\n\n<ol start=\"70\" class=\"wp-block-list\">\n<li><strong>MTP<\/strong> (Medical Termination of Pregnancy) is legally permitted up to <strong>20 weeks<\/strong> of pregnancy in India (amended to 24 weeks for specific categories).<\/li>\n\n\n\n<li><strong>IUDs<\/strong> (Intrauterine Devices) \u2014 copper-T, multiload \u2014 prevent implantation by making the uterus unsuitable.<\/li>\n\n\n\n<li><strong>Oral contraceptive pills<\/strong> contain synthetic estrogen and progesterone \u2014 they prevent ovulation.<\/li>\n\n\n\n<li><strong>STIs<\/strong> (Sexually Transmitted Infections) include gonorrhoea, syphilis, genital herpes, chlamydia, and HIV\/AIDS.<\/li>\n\n\n\n<li><strong>ZIFT<\/strong> (Zygote IntraFallopian Transfer) \u2014 the zygote is transferred to the fallopian tube.<\/li>\n\n\n\n<li><strong>IUI<\/strong> (Intrauterine Insemination) \u2014 semen is artificially introduced into the uterus.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"genetics-evolution\">Genetics &amp; Evolution<\/h3>\n\n\n\n<p>Genetics carries the highest single-chapter weightage in NEET. Every line here is Re-NEET 2026 Biology quick revision priority.<\/p>\n\n\n\n<ol start=\"76\" class=\"wp-block-list\">\n<li><strong>Mendel&#8217;s Law of Segregation<\/strong>: two alleles of a gene separate during gamete formation \u2014 each gamete carries only one allele.<\/li>\n\n\n\n<li><strong>Mendel&#8217;s Law of Independent Assortment<\/strong>: genes for different traits assort independently during gamete formation (applies to genes on different chromosomes).<\/li>\n\n\n\n<li>The <strong>test cross<\/strong> is a cross between an individual of unknown genotype and a <strong>homozygous recessive<\/strong> individual.<\/li>\n\n\n\n<li><strong>Incomplete dominance<\/strong> produces an intermediate phenotype in F1 (e.g., Antirrhinum \u2014 snapdragon \u2014 red \u00d7 white = pink).<\/li>\n\n\n\n<li><strong>Co-dominance<\/strong>: both alleles are fully expressed (e.g., ABO blood group \u2014 I^A I^B = AB type).<\/li>\n\n\n\n<li><strong>Linked genes<\/strong> are located on the same chromosome and tend to be inherited together.<\/li>\n\n\n\n<li><strong>Chromosomal theory of inheritance<\/strong>: genes are located on chromosomes (Sutton and Boveri).<\/li>\n\n\n\n<li><strong>Sex determination in humans<\/strong>: females are <strong>XX<\/strong>, males are <strong>XY<\/strong> \u2014 the Y chromosome carries the <strong>SRY gene<\/strong> that triggers male development.<\/li>\n\n\n\n<li><strong>Haemophilia<\/strong> is an X-linked recessive disorder \u2014 it primarily affects males.<\/li>\n\n\n\n<li><strong>Sickle cell anaemia<\/strong> is an autosomal recessive disorder caused by a point mutation in the <strong>\u03b2-globin gene<\/strong> \u2014 valine replaces glutamic acid at position 6.<\/li>\n\n\n\n<li><strong>Down syndrome<\/strong> (Trisomy 21) \u2014 47 chromosomes instead of 46 \u2014 caused by non-disjunction of chromosome 21.<\/li>\n\n\n\n<li><strong>DNA<\/strong> (deoxyribonucleic acid) is the genetic material in most organisms; <strong>RNA<\/strong> is the genetic material in some viruses.<\/li>\n\n\n\n<li>The <strong>DNA double helix<\/strong> was proposed by <strong>Watson and Crick<\/strong> in 1953; the helix is right-handed with a pitch of 3.4 nm.<\/li>\n\n\n\n<li>In DNA, <strong>A pairs with T<\/strong> (2 hydrogen bonds); <strong>G pairs with C<\/strong> (3 hydrogen bonds) \u2014 Chargaff&#8217;s rule.<\/li>\n\n\n\n<li><strong>Transcription<\/strong> is the synthesis of mRNA from the DNA template; <strong>translation<\/strong> is the synthesis of protein from mRNA at ribosomes.<\/li>\n\n\n\n<li>The <strong>genetic code<\/strong> is a triplet code \u2014 each codon codes for one amino acid; it is universal, non-overlapping, degenerate, and comma-less.<\/li>\n\n\n\n<li><strong>AUG<\/strong> is the start codon (codes for methionine); <strong>UAA, UAG, UGA<\/strong> are stop codons (they do not code for any amino acid).<\/li>\n\n\n\n<li><strong>Lac operon<\/strong> (Jacob and Monod) \u2014 the classic example of gene regulation in prokaryotes. In the presence of lactose, the repressor is inactivated and the structural genes are expressed.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"biology-in-human-welfare\">Biology in Human Welfare<\/h3>\n\n\n\n<ol start=\"94\" class=\"wp-block-list\">\n<li><strong>Penicillin<\/strong> \u2014 the first antibiotic \u2014 was discovered by <strong>Alexander Fleming<\/strong> from the fungus <em>Penicillium notatum<\/em>.<\/li>\n\n\n\n<li><strong>Biofortification<\/strong> is the breeding of crops with higher nutritional quality \u2014 e.g., Golden Rice (enriched with Vitamin A precursor).<\/li>\n\n\n\n<li><strong>Biocontrol agents<\/strong>: <em>Bacillus thuringiensis<\/em> (Bt) produces a protein toxic to insect larvae \u2014 used in Bt cotton and Bt brinjal.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"biotechnology\">Biotechnology<\/h3>\n\n\n\n<p>Biotechnology is compact but highly scoring \u2014 these 4 NCERT Biology lines for NEET 2026 from this section appear almost every year.<\/p>\n\n\n\n<ol start=\"97\" class=\"wp-block-list\">\n<li><strong>Restriction enzymes<\/strong> (restriction endonucleases) cut DNA at specific palindromic sequences \u2014 they are the molecular scissors of genetic engineering.<\/li>\n\n\n\n<li><strong>PCR<\/strong> (Polymerase Chain Reaction) amplifies a specific DNA segment in vitro \u2014 invented by <strong>Kary Mullis<\/strong>.<\/li>\n\n\n\n<li><strong>Recombinant DNA technology<\/strong> involves cutting DNA from two different sources and joining them using DNA ligase to produce recombinant DNA.<\/li>\n\n\n\n<li><strong>Insulin<\/strong> was the first commercial product of recombinant DNA technology \u2014 human insulin (Humulin) is produced in <em>E. coli<\/em> by inserting the human insulin gene.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-to-use-this-re-neet-2026-biology-quick-revision-list-effectively\">How to Use This Re-NEET 2026 Biology Quick Revision List Effectively<\/h2>\n\n\n\n<p>This Re-NEET 2026 Biology quick revision method works on active recall, not passive reading. Don&#8217;t just read \u2014 Cover the answer side and test yourself. For every line you hesitate on, mark it and re-read it twice.<\/p>\n\n\n\n<p>For full exam-day strategy, also check the <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-exam-day-checklist\">Re-NEET 2026 exam day checklist<\/a> and the <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-last-month-strategy\">Re-NEET 2026 last month strategy<\/a>.<\/p>\n\n\n\n<p><strong>Suggested revision schedule before June 21:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>June 6\u201310:<\/strong> Read all 100 lines once slowly. Mark the ones you&#8217;re not confident on.<\/li>\n\n\n\n<li><strong>June 11\u201315:<\/strong> Revise only the marked lines. Cross-check with NCERT.<\/li>\n\n\n\n<li><strong>June 16\u201319:<\/strong> One full run-through of all 100 in under 45 minutes.<\/li>\n\n\n\n<li><strong>June 20 (night before):<\/strong> Final 20-minute scan of lines 51\u2013100 \u2014 the most important Re-NEET 2026 Biology last minute revision pass you&#8217;ll do.<\/li>\n<\/ul>\n\n\n\n<p>Pair this Re-NEET 2026 Biology quick revision list with your <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-complete-study-plan\">Re-NEET 2026 complete study plan<\/a> and <a href=\"https:\/\/ksquareinstitute.in\/blog\/re-neet-2026-biology-mcqs\">Re-NEET 2026 Biology MCQs<\/a> for a complete Biology revision system.<\/p>\n\n\n\n<p>Re-NEET 2026 Biology quick revision is not about cramming. It&#8217;s about recognising the exact line when it appears as an MCQ option. These 100 lines give you that recognition advantage.<\/p>\n\n\n\n<p>These NEET Biology NCERT important lines are your last-mile advantage. All the best for June 21. You&#8217;ve got this.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq-section\">FAQ Section<\/h2>\n\n\n\n<p><strong>Q: Are these verified NCERT Biology lines for NEET 2026?<\/strong> A: Yes. Every line is sourced from Class 11 and Class 12 NCERT Biology textbooks. These are verified NCERT Biology lines for NEET 2026 \u2014 no outside source material has been used. NTA strictly follows NCERT for NEET questions, which is why this list is focused entirely on NCERT content.<\/p>\n\n\n\n<p><strong>Q: Which NEET Biology NCERT important lines come from high-weightage chapters?<\/strong> A: Genetics and Evolution (10\u201312 questions), Reproduction (8\u201310 questions), Human Physiology (8\u201310 questions), and Plant Kingdom (4\u20135 questions) consistently carry the highest weightage. Biotechnology and Biology in Human Welfare together contribute 4\u20136 questions.<\/p>\n\n\n\n<p><strong>Q: Should I use this for Re-NEET 2026 Biology chapter revision or full NCERT reading?<\/strong> A: These 100 lines are for quick revision \u2014 not a replacement for full chapter study. If you have more than 10 days left, revise full chapters first. If you are in the final 3\u20135 days, use this Re-NEET 2026 Biology chapter revision list as your primary tool alongside NCERT diagrams.<\/p>\n\n\n\n<p><strong>Q: How many NCERT Biology lines for NEET 2026 appear directly in the exam?<\/strong> A: Historically, 60\u201370% of NEET Biology questions are either direct NCERT lines or very close paraphrases. The remaining 30\u201340% test application of NCERT concepts. Knowing these 100 lines directly addresses the majority of the Biology section.<\/p>\n\n\n\n<p><strong>Q: For Re-NEET 2026 Biology chapter revision, should I prioritise Class 11 or Class 12?<\/strong> A: Both carry approximately equal weightage \u2014 roughly 45 questions from Class 12 Biology and 45 questions from Class 11 Biology. Neither can be skipped. Class 12 Genetics, Reproduction, and Biotechnology tend to have slightly higher direct-recall question frequency.<\/p>\n\n\n\n<p><strong>Q: What is the best Re-NEET 2026 Biology last minute revision approach for weak chapters?<\/strong> A: Go back to that specific NCERT chapter immediately and read the surrounding context. Don&#8217;t just memorise the line \u2014 understand the concept it represents. NTA often tests the same concept from a different angle or option, so understanding is more useful than rote memorisation.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you open your NCERT textbook right now, you&#8217;ll find over 600 pages of Biology content. But for Re-NEET 2026 Biology quick revision, you don&#8217;t need all of it. You need the 100 lines that NTA has pulled questions from, year after year after year. This list is drawn directly from Class 11 and Class [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5843,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68,2,8],"tags":[2502,1580,2499,2500,2503,1562,1969,2058,2004,2501],"class_list":["post-5842","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-biology","category-neet","category-study-tips","tag-biology-quick-revision-neet","tag-ncert-biology-neet","tag-ncert-important-lines-neet","tag-neet-2026-biology-lines","tag-neet-biology-june-21","tag-neet-biology-revision","tag-re-neet-2026","tag-re-neet-2026-biology","tag-re-neet-2026-preparation","tag-re-neet-biology-preparation"],"blocksy_meta":{"page_structure_type":"type-1","styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":6}},"_links":{"self":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/5842","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/comments?post=5842"}],"version-history":[{"count":1,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/5842\/revisions"}],"predecessor-version":[{"id":5844,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/5842\/revisions\/5844"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/media\/5843"}],"wp:attachment":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/media?parent=5842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/categories?post=5842"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/tags?post=5842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}