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level: allen exercises

Questions and Answers List

level questions: allen exercises

QuestionAnswer
when embryo develops from a haploid cell of embryo sac, other than egg cell the process is known asapogamy
which of the following is a monocarpic plantbamboo
which of the following occurs in an angiosperm ovulea megaspore mother cell undergoes meiosis
typical angiosperms is angiosperm because it possessfruit
ubisch bodies are produced intapetum
tapetum isparietal in origin usually the inner most layer of anther wall
example of polyploid tissue present in an angiosperm plant istapetum
how many cells or nuclei are present in male gametophyte of typical angiospermsthree
essential whorls of a flowersandroecium and gynoecium
endothecium, middle layer and tapetum in anther are derived fromprimary parietal layer
the embryo sac of typical angiosperms derives it's nutrition fromnucellus
the functional megaspore in typical angiosperms is alwayschalazal
crassinucellate ovule showswell developed nucellus
meiosis occurs in sporophytes to producespores
where and by which process are sperm produced in plantsmitosis in male gametophytes
filiform apparatus are found insynergids
raphe and hilum in seed representfuniculus
micropyle in seed helps in the entry ofwater and air
megasporophyll is calledcarpel
the ovule in which single layer nucellar tissue is present is known astenuinucellate
which of the following is the male gametophyte of a flowering plantpollen grain
horizontally oriented ovule in angiosperm is calledhemitropous
all of the following are features of angiospermsin straight line with funiculum at 45 degree with funiculum at right angles with funiculum
in anatropous ovule , the micropyle is presentside by side with funiculum
which of the following types of embryo sac is mostly found in angiospermmonosporic- polygonum type
all the following floral parts are directly involved in pollination or fertilization except thesepal
how many meiotic divisions are required for the formation of 200 seeds of capsella250
an angiosperms, if number of chromosomes in endospearm is 30, what will be the no. of chromosomes in nucellus20
how many meiotic divisions are essential in formation of 100 seeds in cyperaceae family200
how many meiotic divisions are necessary for formation of 100 functional megaspores100
which of the following is the correct sequence of events in a pollen sacmicrosporocyte-meiosis- microspores- mitosis- two haploid cells per pollen grain
helobial endosperm is restricted usually toorder helobiales
the seeds of which type of plant have no dormancymangroves
what is the cause of long dormancy in seedsimpermiable seed coat, presence of ABA/ferulic acid and undeveloped embryo
low temperature induction of germination is calledstratifiction
unisexuality of flowers preventsautogamy, but not geitonogamy
endosperm of gymnosperm plant cycas ishaploid
nucellus is mass of thin walled parenchymatous cells in the ovule. it is2N