Scelta multipla
Dietary supplements and decongestants containing ephedrine have recently become more strongly regulated in the United States. Which phylum contains the plant from which ephedrine is extracted?
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Scelta multipla
In ovulate cones, megasporocytes undergo __________ and produce __________ megaspores.
A
mitosis; diploid
B
meiosis; diploid
C
mitosis; haploid
D
Depending on environmental conditions, any of the listed responses may occur.
E
meiosis; haploid
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Understand the context: Ovulate cones are part of the reproductive system of gymnosperms, such as pine trees. They contain structures where female gametes are produced.
Identify the process: Megasporocytes are cells within the ovulate cones that undergo a specific type of cell division to produce megaspores. This process is meiosis, which is crucial for sexual reproduction.
Clarify meiosis: Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four genetically distinct haploid cells. It is essential for producing gametes in plants and animals.
Determine the outcome: After meiosis, megasporocytes produce haploid megaspores. Haploid cells have one set of chromosomes, which is necessary for fertilization and the formation of a diploid zygote.
Conclude the reasoning: The correct answer is 'meiosis; haploid' because megasporocytes undergo meiosis to produce haploid megaspores, which are essential for the reproductive cycle of gymnosperms.
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