STRUCTURAL ORGANISTION OF PLANTS AND ANIMALS
ANATOMY OF FLOWERING PLANTS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a haploid egg cell
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a diploid zygote
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a haploid sperm cell
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a triploid cell
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Detailed explanation-1: -Endosperm is a triploid tissue in angiosperms, because double fertilization results in the formation of a diploid zygote and a triploid endosperm.
Detailed explanation-2: -After fertilization, the ovule develops into a seed, and the ovary develops into a fruit.
Detailed explanation-3: -Fertilization is much different with angiosperms than compared to other plant organisms because these plants perform double fertilization. Double fertilization occurs when pollen hits the stamen, or female part of a plant.
Detailed explanation-4: -Pollen wall morphology. The pollen of angiosperms is different from that of all other seed plants in having a tectate-columellate structure. This means that the outer layer of the pollen wall (exine) is differentiated into two layers separated by columns (Figure 10.11).
Detailed explanation-5: -Most angiosperms have a Polygonum-type embryo sac with two polar nuclei and produce a triploid (3n) endosperm as in Arabidopsis. In a few species, more than two polar nuclei are present in the central cell leading to the formation of endosperm with a ploidy higher than 3n [3].