Refer to the transverse section of ovary of mustard plant. Identify X and Y in it:
X Y
Seed Locule
X Y
Pericarp Seed
X Y
Seed Pericarp
X Y
Placenta Seed
As we learn
Zygote formation flowering plants -
The zygote develops into the embryo and the ovules develop into the seed. The ovary develops into the fruit which develops a thick wall called pericap that is protective in function. After dispersal, seeds germinate under favourable conditions to produce new plants.
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Hence, the correct answer is option c.