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level: allen exercises

Questions and Answers List

level questions: allen exercises

Question	Answer
when embryo develops from a haploid cell of embryo sac, other than egg cell the process is known as	apogamy
which of the following is a monocarpic plant	bamboo
which of the following occurs in an angiosperm ovule	a megaspore mother cell undergoes meiosis
typical angiosperms is angiosperm because it possess	fruit
ubisch bodies are produced in	tapetum
tapetum is	parietal in origin usually the inner most layer of anther wall
example of polyploid tissue present in an angiosperm plant is	tapetum
how many cells or nuclei are present in male gametophyte of typical angiosperms	three
essential whorls of a flowers	androecium and gynoecium
endothecium, middle layer and tapetum in anther are derived from	primary parietal layer
the embryo sac of typical angiosperms derives it's nutrition from	nucellus
the functional megaspore in typical angiosperms is always	chalazal
crassinucellate ovule shows	well developed nucellus
meiosis occurs in sporophytes to produce	spores
where and by which process are sperm produced in plants	mitosis in male gametophytes
filiform apparatus are found in	synergids
raphe and hilum in seed represent	funiculus
micropyle in seed helps in the entry of	water and air
megasporophyll is called	carpel
the ovule in which single layer nucellar tissue is present is known as	tenuinucellate
which of the following is the male gametophyte of a flowering plant	pollen grain
horizontally oriented ovule in angiosperm is called	hemitropous
all of the following are features of angiosperms	in straight line with funiculum at 45 degree with funiculum at right angles with funiculum
in anatropous ovule , the micropyle is present	side by side with funiculum
which of the following types of embryo sac is mostly found in angiosperm	monosporic- polygonum type
all the following floral parts are directly involved in pollination or fertilization except the	sepal
how many meiotic divisions are required for the formation of 200 seeds of capsella	250
an angiosperms, if number of chromosomes in endospearm is 30, what will be the no. of chromosomes in nucellus	20
how many meiotic divisions are essential in formation of 100 seeds in cyperaceae family	200
how many meiotic divisions are necessary for formation of 100 functional megaspores	100
which of the following is the correct sequence of events in a pollen sac	microsporocyte-meiosis- microspores- mitosis- two haploid cells per pollen grain
helobial endosperm is restricted usually to	order helobiales
the seeds of which type of plant have no dormancy	mangroves
what is the cause of long dormancy in seeds	impermiable seed coat, presence of ABA/ferulic acid and undeveloped embryo
low temperature induction of germination is called	stratifiction
unisexuality of flowers prevents	autogamy, but not geitonogamy
endosperm of gymnosperm plant cycas is	haploid
nucellus is mass of thin walled parenchymatous cells in the ovule. it is	2N