
The embryos in sporophytic budding are
A. Diploid
B. Haploid
C. Both (A) and (B)
D. None of the above
Answer
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Hint: The angiosperm life cycle is comprised of a gametophyte phase and a sporophyte phase. The cells of a sporophyte body contain a full complement of chromosomes. The sporophyte is the typical plant body that we can see when we see an angiosperm.
Complete step-by-step answer:
Sporophytic budding is otherwise referred to as apomixis. The sporophytic budding process produces diploid embryos. The sporophytic cells which enclose the embryo, sometimes develop into new sporophytes within the seed. This tissue is known as the nucellus, and the generation of an embryo from such cells is known as nucellar embryony. This process may produce two embryos in a single seed(one apomictic and the other by fertilization of the egg). The sporophyte generates spores by meiosis, a process also called "reduction division" that decreases the number of chromosomes in every single spore mother cell by half. Resultant meiospores evolve into a gametophyte. Both the resulting gametophyte and the spores are haploid ie they only contain one set of chromosomes.
The mature gametophyte generates female or male gametes (or both) by mitosis. The fusion of female and male gametes yields a diploid zygote which evolves into a new sporophyte. This cycle is called alternation of phases or alternation of generations.
Therefore, the correct option is A.
Note: In the seed plants, the biggest groups of which are the flowering plants (angiosperms) and gymnosperms, the sporophyte stage is more important than the gametophyte. It is a familiar green plant with its leaves, stem, roots, and flowers or cones. In flowering plants, the gametophytes are very decreased in size and are characterized by the embryo sac and germinated pollen.
Complete step-by-step answer:
Sporophytic budding is otherwise referred to as apomixis. The sporophytic budding process produces diploid embryos. The sporophytic cells which enclose the embryo, sometimes develop into new sporophytes within the seed. This tissue is known as the nucellus, and the generation of an embryo from such cells is known as nucellar embryony. This process may produce two embryos in a single seed(one apomictic and the other by fertilization of the egg). The sporophyte generates spores by meiosis, a process also called "reduction division" that decreases the number of chromosomes in every single spore mother cell by half. Resultant meiospores evolve into a gametophyte. Both the resulting gametophyte and the spores are haploid ie they only contain one set of chromosomes.
The mature gametophyte generates female or male gametes (or both) by mitosis. The fusion of female and male gametes yields a diploid zygote which evolves into a new sporophyte. This cycle is called alternation of phases or alternation of generations.
Therefore, the correct option is A.
Note: In the seed plants, the biggest groups of which are the flowering plants (angiosperms) and gymnosperms, the sporophyte stage is more important than the gametophyte. It is a familiar green plant with its leaves, stem, roots, and flowers or cones. In flowering plants, the gametophytes are very decreased in size and are characterized by the embryo sac and germinated pollen.
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