Which of the following processes is not involved in endosperm development in flowering plants?
Double fertilisation
Cell elongation
Cell division
Vascular tissue differentiation
Endosperm development in flowering plants includes a number of processes such as double fertilisation, cell elongation, and cell division. In flowering plants, double fertilisation occurs when one sperm fertilises the egg to form the zygote and the second sperm merges with the central cell to form the endosperm. This step is required for the formation of the endosperm.
Cell elongation is the increase in cell size during endosperm development that leads to endosperm tissue growth and expansion. Cell division is also an important phase in endosperm development since it results in the production of numerous cells, which contribute to the endosperm's overall growth and development.
Vascular tissue differentiation, on the other hand, is not directly involved in endosperm formation. Vascular tissue differentiation is the process by which vascular tissues in plants, such as xylem and phloem, differentiate and develop. While vascular tissues are vital for overall plant development, they are not directly engaged in the formation of the endosperm, which is largely a nutritional tissue that supports the development of the developing embryo.
Hence, the correct answer is option 4.