Bio 172 HW 2 – Flashcards
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In pines, the female gametophyte contains_______, each of which contains a(n)_______
a) archegonia ... sperm cell
b) antheridia ... sperm cell
c) antheridia ... egg
d) archegonia ... egg
e) microsporangia ... egg cell
answer
d) archegonia...egg
(In pines, a megaspore repeatedly grows and divides, giving rise to a female gametophyte. The female gametophyte is the site in which egg-bearing gametophytes develop.)
question
In pines, an embryo is a(n)
a) immature female gametophyte
b) food reserve for the immature sporophyte
c) immature sporophyte
d) seed
e) immature male gametophyte
answer
c) immature sporophyte
(The diploid embryo will develop into a seedling and then into a mature pine tree.)
question
In pine trees, pollen grains get to the ovule via the _____.
a) integument
b) micropyle
c) pollen cone
d) megaspore
e) eggs
answer
b) micropyle
(Pollen grains gain entry into the ovule via the micropyle.)
question
Which of these statements is true about the gametophyte tissue that surrounds the pine embryo?
a) It functions as a diploid food reserve.
b) It functions as a triploid food reserve.
c) It develops from the fusion of a microspore and a megaspore.
d) It functions as a haploid food reserve.
e) It is the remnant of the pollen tube.
answer
d) it functions as a haploid food reserve
(This gametophyte tissue is a source of nourishment for the embryo.)
question
Of the four haploid cells produced by a pine cone's megasporocyte (megaspore mother cell), _____ survive(s).
a) integuments
b) four
c) two
d) three
e) one
answer
e) one
question
In the pine, microsporangia form _____ microspores by _____.
a) diploid ... meiosis
b) haploid ... meiosis
c) diploid ... mitosis
d) haploid ... mitosis
e) triploid ... fertilization
answer
b) haploid... meiosis
(Diploid microsporangia form haploid microspores by meiosis.)
question
Which of these is unique to flowering plants?
a) a dominant sporophyte generation
b) pollen production
c) an embryo surrounded by nutritive tissue
d) haploid gametophytes
e) double fertilization
answer
e) double fertilization
(In flowering plants one sperm nucleus fertilizes the egg and the other sperm nucleus fuses with two other nuclei found within the ovule, thus forming triploid endosperm.)
question
The male gametophytes of flowering plants are also referred to as _____.
a) male sporophytes
b) embryo sacs
c) endosperm
d) pollen grains
e) megaspores
answer
d) pollen grains
question
In flowering plants the integuments of the ovule develop into a(n) _____.
a) endosperm
b) seed coat
c) fruit
d) sporophyte
e) cotyledon
answer
b) seed coat
(The integuments of the ovule develop into a tough seed coat)
question
A carpel is composed of _____.
a) stigma, style, and ovary
b) zygote, anther, and endosperm
c) ovule, megasporocyte, and anther
d) petal, sepal, and stamen
e) ovary, ovule, and anther
answer
a) stigma, style, and ovary
question
A stamen consists of _____.
a) stigma and style
b) stigma and anther
c) anther and filament
d) stigma and filament
e) ovary and sepal
answer
c) anther and filament
question
In angiosperms, pollination is the transfer of pollen grain to the _____ of a flower on the same plant or another plant of the same species.
a) style
b) anther
c) stigma
d) ovary
e) ovulate cone
answer
c) stigma
(pollen sticks to the sticky stigma)
question
Which of these structures is a separate generation from the plant sporophyte?
a) A male gametophyte within a pollen grain
b) A seed
c) The ovule
answer
a) a male gametophyte within a pollen grain
