Read the passage carefully and answer the questions based on the passage:

Passage: Pollen pistil interaction involves all events from the landing of pollen grains on the stigma until the pollen tube enters the embryo sac (when the pollen is compatible). When a pollen tube grows through the style and enters into the ovules, it finally discharges two male gametes in one of the synergids.

Syngamy and triple fusion are two fusion events that occur in angiosperms. Thus, angiosperms exhibit double fertilization. The products of these fusions are the diploid zygote and triploid primary endosperm nucleus. Zygote develops into embryo and primary endosperm cell forms the endosperm tissue. The developing embryo passes through different stages before maturation.

With reference to reproduction in flowering plants, which one of the following is incorrect?

The correct option is: Endosperm develops into seed.

Let us analyze the statements step-by-step to understand why this option is the incorrect statement (and thus the correct answer to the question):

1. Analyzing the incorrect statement: "Endosperm develops into seed"
In angiosperms, after double fertilization, the ovule develops into the seed, and the ovary develops into the fruit. The triploid primary endosperm nucleus (PEN) develops into the endosperm, which serves as a nutritive tissue to support the developing embryo. It does not develop into the seed itself. Therefore, this statement is biologically incorrect.

2. Verifying the correctness of the other options:
• Ovary develops into fruit: This is a correct biological fact. Post-fertilization, the ovary walls thicken and mature to form the fruit.
• Ploidy of PEN is 3n: This is also correct. The Primary Endosperm Nucleus (PEN) is formed by the fusion of three haploid nuclei (one male gamete and two polar nuclei in triple fusion), making its ploidy triploid (3n).
• Syngamy is the fusion of male and female gamete: This is the definition of syngamy, which leads to the formation of a diploid zygote (2n).

Since the question asks for the incorrect statement, the only false statement among the choices is that "Endosperm develops into seed".