36. Plant Reproduction

The ABC model of flower formation suggests that __________.

The male structures of angiosperms are called __________, and they produce __________.

In the alternation of generations in plants, __________.

Which of the following associations is correct?

The female structures of angiosperms are called __________, and they produce __________.

Flowers bear seeds in protective chambers called __________.

Which two structures of a flower bear sporangia?

A generative cell and a tube cell originate when __________.

How many pollen grains can potentially result from one microsporocyte?

What is the purpose of synergids in an ovule?

In the process of pollination, pollen grains are transferred from the __________ to the __________.

Like gymnosperms, many grasses and angiosperm trees are wind-pollinated. To conserve energy, these angiosperms do not produce complete flowers (complete flowers have all four of the basic parts). Which basic part would most likely be missing from wind-pollinated angiosperm flowers?

How do most flowering plants avoid self-fertilization?

What is the underlying feature that allows plants to reproduce asexually?

In this type of asexual reproduction, seeds are produced even without the joining of sperm and eggs.

In an environment that is very stable, with reliable moisture and temperature, what type of reproduction would be most advantageous for a plant, and why?

Which statement below accurately describes the role of S-genes in plants?

In angiosperms, each pollen grain produces two sperm. What do these sperm do? a. Each one fertilizes a separate egg cell. b. One fertilizes an egg, and the other is kept in reserve. c. Both fertilize a single egg cell. d. One fertilizes an egg, and the other fertilizes a cell that develops into stored food.

Match questions 3–8 with options a–f. 3. Attracts pollinator 4. Develops into seed 5. Protects flower before it opens 6. Produces sperm 7. Produces pollen 8. Houses ovules a. pollen grain b. ovule c. anther d. ovary e. sepal f. petal

Some dioecious species have the XY genotype for male and XX for female. After double fertilization, what would be the genotypes of the embryos and endosperm nuclei? a. embryo XY/endosperm XXX or embryo XX/endosperm XXY b. embryo XX/endosperm XX or embryo XY/endosperm XY c. embryo XX/endosperm XXX or embryo XY/endosperm XYY d. embryo XX/endosperm XXX or embryo XY/endosperm XXY

A small flower with green petals is most likely a. bee-pollinated. b. bird-pollinated. c. bat-pollinated. d. wind-pollinated.

Name two kinds of asexual reproduction among plants. Explain two advantages of asexual reproduction over sexual reproduction. What is the primary drawback of asexual reproduction?