NEET BIOLOGY

STRUCTURAL ORGANISTION OF PLANTS AND ANIMALS

ANATOMY OF FLOWERING PLANTS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What structure forms during angiosperm fertilization but does not form during fertilization among other types of plants?
A
a haploid egg cell
B
a diploid zygote
C
a haploid sperm cell
D
a triploid cell
Explanation: 

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].

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