Competitive Exams: Revision Terminology Part 25

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  • High auxin concentration – stimulatory for stem

  • High auxin concentration – inhibiroty for root

  • Auxin -> female flower increase & parthmograpy induced

  • IAA promote liberation of water soluble xyloglucan from cell wall.

  • Benzoic acid derivations – powerful weed killer

  • 2 – 4 D – Selective weed killer (kills dicots), Flowering in litchi, prevents food drop.

  • IBA – induce rooting of cuttings

  • IPA – induce rooting of cutting, natural fruit setting

  • NAA – induce rooting cutting, natural fruit setting, prevent sprouting of polatoes.

  • Gibberllic acid – terepenes, move by xylem sap. Most effective when applied on whole body, in apical of young leaves & roots, stein elongation, break bud dormancy.

  • Bolting of cabbage, promote flower in LDP, increase fruit size & bunch length of grapes.

  • Antigibberllics / growth retardants – maleic hydrazide, phosphon D, chlorocholine chloride(CCC)

  • C + Auxin => cell division in non meristamitic parts also induce inorphogenesis.

  • Ethylene – not move through air spaces induce flowering, ripening, no of female flower , ethephone is broken to relase ethglene in plants.

  • ABA – terpenoids, inhibit mitosis, induce dormancy, stress hormone, regulate fruit drop.

  • Synergism – when combined effect of growth hormone > individual effect.

  • Pea seeds in dark contain a lot ethylene but not in light.

  • Cytokine prevent chl degradation – Richmond Lang effect.

  • Auxanometer – measures growth.

  • Crescograph – measures growth in seconds.

  • Clinostat – eliminate effect of geotropism.

  • Tromatotropism – movement due to injury

  • Auxin & Cytokinin – retaord abscission

  • ABA & ethylene – accelerate abscission

  • Time between perception of stimulus & reaction = presentation time

  • Red region of light is best for seed germination.

  • Infrared region of light is best for seed domains.

  • Senescence

    1. Whole plant – whole plant die after seed product, monocarpic, rice, wheat, gram mustone.

    2. Sequential – older & latered regions die & apical produces perennial plant.

    3. Shoot – aboveground portion dies after producing fruits banana, gladiolus.

    4. Simull aneous / Synchronoers-elm, maple – all leaf shed in late autumn(Oct).

  • Control of development of form by light = morphogenesis(photo)

  • Defoliation of forest tree = 2 – 4 dichlorophynoxy acetic acid

  • Fruit ripening – 80% C2H4 + 20 % CO2

  • Agent orange – weedicide containing dioxin.

  • Lethal genes are mostly recessive (eg. Thallesemia)

  • Manx cat (without tonil) is heterozygous for dominate allde which cause notail, in homozygous it is lethal

  • Expressivity – intersity of phenotypic expression of genes may

  • Percentages freq with which a gene manifests its phonotypic effect = penetrance

  • Colour of pea, wing of Drosophila = Complete Penetrance, Diabetes milletus = incomplete penetrance.

  • Gene pool = seem of genes in reproduction gametes of popl.

  • Mutation, selection & migration causes changes in genetic drift.

  • Only one Y-chr is sufficient to induce maleness

  • Controlled sex mechanism = melandrium

  • Genes cocated on mitrochondria generally show maternal inheritance

  • Epistatis – dominant of are allele on another allele of both loci

  • Crossing over is resp. for recombination of linked alleles.

  • Bacteria – prokaryotes without ehla.

  • Louis pastear – formder of modern bacteriology

  • Old Cultures of Gm positive bacteria lose the ability to retain crystal violet.

  • Iodine solution act as mordant & help to fix the primary dye to bacteria.

  • If mendel studied the T traits with 12 chr instead of 14 chr he would have disc the law of independent assortment

  • Rain water is free from bacteria Gm negative fail to retain primary crystal violet stain.

  • Bactria flagella – much thinner, rotate round base life propeller hollow, non helical filamentous made of protein pilin.

  • Bacteria – peptidoglycan – N acetyl glucosamine (NAG) & N – acetylmuromic

  • Acid (NAM) held by 1, linkages 4AA – lalanine, D – Glutamic acid, Hysine, D alanine