Ch. 38 Angiosperm Reproduction Flashcards

big ideas: alteration of generations, parts of male/female flowers, double fertilization, parts of a seed, what a fruit is, pollination

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1
Q

what is the function of sepals?

A

to enclose and protect the bud of a flower

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2
Q

what is the function of petals?

A

to attract pollinators by size/colour/shape

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3
Q

what are the components of the stamen?

A

the anther and filament

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4
Q

what is the function of a stamen?

A

to produce pollen grains, which contain the male sex cells of plants

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5
Q

what are the four components of the carpel?

A

style, ovary, ovule, stigma

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6
Q

what is the function of the plant ovary?

A

to house ovules, which will become the fruit of the plant once fertilized

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7
Q

what is the function of the plant ovules?

A

to house the egg cells and receive pollen from angiosperm pollen grains, will make the seed once fertilized

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8
Q

what is the function of the style?

A

to serve as the “bridge” between the ovary and stigma

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9
Q

what is the function of the stigma?

A

to act as a landing platform for sperm, which then travel down the style

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10
Q

what are complete flowers?

A

flowers with all 4 floral organs = bisexual = may be able to self fertilize (M AND F)

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11
Q

what are incomplete flowers?

A

flowers that lack a particular reproductive organ. may be unisexual (M OR F)

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12
Q

what is a monoecious plant?

A

a plant with both types of unisex flowers

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13
Q

what is a dioecious plant?

A

a plant which only has one sex (all male or female flowers)

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14
Q

what do sporophytes produce?

A

spores in the form of megasporocytes [female] and microsporocytes [male]

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15
Q

what is a composite flower?

A

a flower composed of multiple smaller flowers aggregated together [sunflowers/daisies]

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16
Q

what are the two phases angiosperm plants go through in alternation of generations?

A

-sporophyte [2n] and gametophyte [n] phases

17
Q

what do microsporocytes produce? is it using mitosis or meiosis?

A

2n microsporocytes produce n microspores through meiosis

18
Q

what do microspores produce? do they use mitosis or meiosis?

A

-n microspores produce male gametophytes [pollen grains - n] through mitosis

19
Q

what do male gametophytes produce?

A

gametes - sperm cells which are 1n

20
Q

what do megasporocytes produce, and is it through mitosis or meiosis?

A

megasporocytes [2n] produce megaspores [n] through meiosis

21
Q

what do megaspores produce, and is it through mitosis or meiosis?

A

megaspores produce female gametophytes [n] - embryo sacs - through mitosis

22
Q

what happens to the ovary and ovule upon fertilization?

A

the ovary becomes the fruit; the ovule becomes the seed

23
Q

what is the function of the egg?

A

to fuse with 1 of the 2 pollen sperms to make a zygote

24
Q

what is the function of polar nuclei?

A

to fuse with 1 of the 2 pollen sperms to produce the endosperm

25
Q

what is the function of the synergids?

A

to guide the pollen sperm cells to the egg + polar nuclei

26
Q

what 8 cells are formed by the megaspore’s embryo sac?

A

1x egg
2x polar nuclei
2x synergids
3x antipodal cells [unknown function]

27
Q

what is pollination?

A

the transfer of pollen from anther to stigma

28
Q

what are pollinators?

A

animals that facilitate the transfer of pollen from the anther to the stigma - butterflies, bees, bats, moths, flies, etc

29
Q

what are the 3 components of a fertilized seed?

A

seed coat - protects the seed
embryo - develops from zygote
endosperm - provides food

30
Q

how does the endosperm differ in monocots and eudicots?

A

monocots - endosperm stays in seed
eudicots - endosperm becomes 2x cotyledons

31
Q

what is seed dormancy?

A

a state of low metabolic rate (no growth / development) until the right environmental conditions occur

32
Q

what is germination?

A

the breaking of the seed coat by the seed, depends on imbibition

33
Q

what is the radicle?

A

the part of the plant embryo that becomes the primary root - will be the 1st to leave the seed

34
Q

if the radicle is the 1st structure to leave the seed, what is the 2nd?

A

-hypocotyl in eudicots
-coleoptile in monocots

35
Q

what is the function of the fruit?

A

to protect and disperse seeds

36
Q

why does fruit only develop for pollinated flowers?

A

no pollination = no seed = nothing to disperse = no point making a fruit