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Heterospory is the production of spores of two different sizes and sexes by the sporophytes of land plants. Heterospory was evolved from isospory independently by several plant groups in the Devonian period as part of the process of evolution of the timing of sex differentiation. Heterosporic plants produce small spores called microspores which either germinate to become male gametophytes or have reduced male gametophytes packaged within them, and similarly larger spores called megaspores that germinate into female gametophytes, or which have female gametophytes packaged within them.
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∙ 14y ago
Alfred Chong
increased survival rates of gametophyte as it is enclosed within a sterile jacket of cells ... also, this advancement set the stage for evolution of seeds and pollen
Wiki User
∙ 13y agoincreased survival rates of gametophyte as it is enclosed within a sterile jacket of cells ... also, this advancement set the stage for evolution of seeds and pollen
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Why is heterospory considered an important step towards seed habit?
Heterospory means two kinds of spore- microspores and macrospores.
What are the advantages of heterospory?
· Plants can maximize efficient resource allocation · Promotes genetic exchange
The heterosporous condition led to evolution of?
Heterospory led to the evolution of sex differentiation timing in Devonian plants. This evolution led to sporophytes of varying sizes and sexes.
What are three steps in evolution of seed?
there are three steps for evolution of seed 1. origin of heterospory 2. development of integument layer for megasporangia which protect and supply food. 3. retention of imatuare megaspores in the sporangia.
Words ending with the suffix - or?
trajectory, valedictory, accessory, hickory, mandatory, history, factory, satasfactory accessory accusatory additory adjudicatory adjuratory admonitory adulatory advisory aleatory allegory amatory ambulatory amelioratory amendatory annihilatory annunciatory anovulatory anticipatory antiregulatory antistory apospory applicatory appreciatory approbatory armory articulatory assimilatory auditory auscultatory benedictory calefactory calory cardiorespiratory castratory category celebratory certificatory chancellory chiccory chickory chicory circulatory circumlocutory citatory classificatory clearstory clerestory combinatory commendatory comminatory communicatory compensatory compulsory conciliatory conclusory condemnatory condolatory confabulatory confirmatory confiscatory congratulatory consecratory conservatory consistory consolatory constellatory consummatory contradictory contributory copulatory corroboratory Cory cosignatory crematory cursory damnatory declamatory declaratory decretory dedicatory defamatory delusory denigratory denunciatory depilatory depository deprecatory depreciatory depredatory derisory derogatory designatory desultory deviatory dextrorotatory dilatory directory discriminatory dispensatory dissatisfactory dissimilatory divinatory dormitory dory ejaculatory elusory enactory equilibratory escalatory ethnohistory exaggeratory excitatory exclamatory excretory exculpatory excusatory executory exhibitory exhortatory expiatory expiratory explanatory expletory explicatory exploratory expository expostulatory expurgatory extenuatory exterminatory extrasensory facilitatory factory feretory feudatory flavory fumatory fumitory gesticulatory glory gory gratulatory gustatory gyratory hallucinatory herbivory herstory heterospory hickory history homospory hortatory illusory immunomodulatory immunoregulatory imprecatory improvisatory incantatory incisory incriminatory incubatory inculpatory indicatory inflammatory informatory ingratiatory inhibitory initiatory innovatory inspiratory intercessory interdictory interjectory interlocutory interrogatory intersensory intimidatory introductory inundatory inventory investigatory invitatory invocatory isospory ivory judicatory juratory justificatory laboratory laudatory lavatory levorotatory libratory locomotory locutory lory maledictory mandatory manipulatory manufactory masticatory masturbatory mediatory memory microcirculatory midstory migratory minatory mitigatory modulatory monitory moory moratory multisensory multistory natatory negotiatory neurosecretory neurosensory nonauditory noncontradictory noncontributory nondiscriminatory nonexplanatory noninflammatory nonmigratory nonobligatory nonparticipatory nonsecretory nonstory nonsupervisory nugatory obfuscatory objurgatory oblatory obligatory observatory offertory olfactory oratory oscillatory osculatory osmoregulatory overcompensatory overstory ovulatory participatory pellitory perambulatory peremptory performatory perfunctory persecutory perspiratory pillory piscatory placatory possessory postcopulatory poststimulatory potatory precatory preceptory precopulatory precursory predatory predicatory preemptory prefatory prehistory premonitory preovulatory preparatory priory probatory profanatory prohibitory prolusory promissory promontory propitiatory protectory protohistory provisory psychohistory punitory purgatory purificatory recommendatory reconciliatory recriminatory rectory redemptory refectory reformatory refractory regulatory remuneratory renunciatory repertory repository reprobatory rescissory respiratory responsory retaliatory retributory revelatory reverberatory revisory rogatory rotatory saltatory salutatory satisfactory savory secretory seigniory seignory sensory signatory signiory signory somatosensory statutory stimulatory stipulatory story stridulatory suasory subcategory subinhibitory succory sudatory supererogatory supersensory supervisory suppletory supplicatory suppository suspensory territory theory thermoregulatory tory trajectory transitory translatory transmigratory understory undulatory unsatisfactory unsavory vainglory valedictory vanitory vapory ventilatory vibratory victory vindicatory vituperatory vomitory
Syllabus for msc botany entrance exam?
m.sc. in zoology 's entrance exam's syllabus for delhi university..and m.sc. in botany's syllabus for du..also provide me syllabs for preparationof m.sc. entrance exam in genetics and anthropology. thnx
What are words that have the root term?
verb decisive
