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What is the primary function of an ovule in plants?
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The primary function of an ovule is to develop into a seed upon fertilization. It houses the female gametophyte and the egg cell.
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Name the two main parts of an ovule.
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The two main parts of an ovule are the integuments and the nucellus.
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What is the function of the integuments in an ovule?
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Integuments protect the nucellus and later develop into the seed coat after fertilization.
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What role does the nucellus play in the ovule?
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The nucellus provides nutrients and protects the developing female gametophyte.
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What is the micropyle in an ovule?
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The micropyle is the small opening in the integuments of the ovule that allows for pollen tube entry and fertilization.
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Describe the role of the funiculus in an ovule.
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The funiculus attaches the ovule to the ovary, supplying nutrients and anchoring the ovule.
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How many integuments are typically found in an ovule?
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Most ovules have one to two integuments.
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What is a megaspore mother cell?
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A megaspore mother cell is a diploid cell in the nucellus that undergoes meiosis to produce megaspores, one of which will develop into the female gametophyte.
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What is the purpose of the chalaza in an ovule?
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The chalaza is the region where the nucellus and integuments merge and serves as a nutrient transport zone.
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How does fertilization occur inside the ovule?
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Fertilization occurs when a pollen tube enters through the micropyle and releases sperm cells, one of which fertilizes the egg cell in the embryo sac.
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What is the role of the embryo sac in an ovule?
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The embryo sac contains the egg cell and serves as the location for fertilization and initial stages of seed development.
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How do ovules differ between gymnosperms and angiosperms?
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Gymnosperms have exposed ovules on cones, while angiosperms have enclosed ovules within a fruiting ovary.
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What is double fertilization in relation to ovules?
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Double fertilization is the process where one sperm cell fertilizes the egg and another fertilizes two polar nuclei to form endosperm.
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What changes occur to the ovule post-fertilization?
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Post-fertilization, the ovule develops into a seed, with integuments forming the seed coat and the zygote growing into an embryo.
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What is the role of the antipodal cells in an ovule?
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Antipodal cells are involved in nourishing the embryo sac, although their exact role varies.
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