CH38 And CH39 (QUIZZES) AGRC1021

25 July 2022
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Meiosis will produce microspores in the
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Anther
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anther
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male reproductive microspores
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Which association below is correct?
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dioecious ... separate female and male plants
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dioecious
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the males and females are on separate plants
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In angiosperms, each pollen grain produces two sperm. What do these sperm do?
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One fertilizes an egg, and the other combines with two polar nuclei, which develop into stored food cells (endosperm) Fertilization of an egg produces a zygote, and the combination of the two polar nuclei produces a triploid cell that will develop into the endosperm
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The germination of seeds
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depends on imbibition
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Imbibition
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absorption of water by the seed, causes the seed to expand and rupture
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Which of the following is an example of sexual reproduction?
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fusion of sperm and egg nuclei in an ovule
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Which of the following is an advantage of asexual reproduction in plants?
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enhanced survival of genetically favorable offspring
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Self-incompatibility
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helps maintain genetic variability in a population
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In grafting, the plant that provides the root system is the _____ and the twig is the _____
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stock ... scion
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stock plant
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provides the root system
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scion
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grafted twig
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Which of the following is one possible advantage of biofuels vs. oil?
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The CO2 produced by biofuels will be absorbed by the crops used to produce them, creating a carbon-neutral cycle
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Which example below is a concern related to the debate over plant biotechnology?
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introduced genes spreading into related wild species and leading to the creation of "superweeds"
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Plant hormones act by directly affecting the activities of
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signal transduction pathways
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Plant hormones act by activating/deactivating
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signal transduction pathways
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Which of the following seedlings will probably bend toward light?
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one whose tip is separated from its base by a gelatin block
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gelatin block
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allows the passage of substances that regulate phototropism
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The Pr form of the phytochrome pigment has maximum absorption in the _____ part of the spectrum.
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red
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A biological cycle with a period of about 24 hours is called
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a circadian rhythm
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a circadian rhythm
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events that follow approximately 24-hour cycles
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Most plants flower when The flowering of many plants is stimulated by the duration of periods of uninterrupted darkness
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the nights are the right length
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The molecule most involved in the flowering process is
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FT protein
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Thigmotropism is a movement in response to
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touch
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Thigmotropism
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directional growth in response to touch
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Which one of the following is a response in plants to a water deficit?
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reduction in the rate of transpiration
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Strains of pathogens that mildly harm, but do not kill, the host plant are termed
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avirulent
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avirulent pathogen
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gains enough access to its host to enable it to perpetuate itself without severely damaging or killing the plant