Read the passage carefully and answer the questions based on the 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 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?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Endosperm develops into seed
After double fertilisation, each part of the flower has a fixed fate. The zygote forms the embryo and the primary endosperm cell forms the endosperm. The ovule becomes the seed and the ovary becomes the fruit.
Option (1) Endosperm develops into seed — An incorrect statement. The seed develops from the ovule, not from the endosperm. The endosperm is only the food store inside the seed for the embryo.
Option (2) Ovary develops into fruit — A correct statement. The ovary wall becomes the fruit wall, called pericarp.
Option (3) Ploidy of PEN is 3n — A correct statement. The primary endosperm nucleus forms by triple fusion: one male gamete (n) fuses with two polar nuclei (n + n). So n + n + n = 3n.
Option (4) Syngamy is the fusion of male and female gamete — A correct statement. One male gamete fuses with the egg cell to form the diploid zygote.
Note: The passage is taken from NCERT. NTA has put lines of the NCERT text together to make it. Most CUET (UG) questions come straight from NCERT, so study the book line by line, including figures and their titles.
NCERT Extract:
Seed – …
