Question
Correct sequence of steps in pollination and fertilization in plants.
A. Transfered pollen germinates and reaches embryo sac
B. Pollen tube penetrates stigmatic tissues and enters ovary
C. Tip of pollen tube ruptures and one sperm nucleus fuses egg
D. Other sperm nucleus unites two polar nuclei form primary endosperm
E. After fertilization, embryo and endosperm differentiate to form seed
Choose the correct answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
A, B, C, D, E
Understanding Plant Reproduction Steps
This section outlines the essential stages involved in the process of pollination and fertilization in flowering plants, leading to seed formation.
Sequence of Pollination and Fertilization
The correct sequence follows the biological progression from pollen landing on the stigma to the development of a seed.
- Pollen Germination: Following pollination, the pollen grain absorbs moisture and nutrients from the stigma, initiating germination. A pollen tube starts to grow downwards, seeking the embryo sac within the ovule. (Corresponds to Step A)
- Pollen Tube Growth: The pollen tube navigates through the stigma and style tissues, directing its growth towards the ovary where the ovules are located. It carries the male gametes. (Corresponds to Step B)
- Fertilization of Egg Cell: Upon reaching the embryo sac inside an ovule, the pollen tube ruptures. One of the two male gametes (sperm nuclei) fuses with the egg cell, forming a diploid zygote. (Corresponds to Step C)
- Formation of Endosperm: The second male gamete travels to the central cell of the embryo sac and fuses with the polar nuclei (typically two), creating a triploid primary endosperm nucleus. This dual fusion event is termed double fertilization. (Corresponds to Step D)
- Seed Development: Post-fertilization, the zygote differentiates into the embryo, and the primary endosperm nucleus develops into the endosperm, which serves as nutritive tissue. The ovule consequently matures into a seed. (Corresponds to Step E)
Conclusion
Based on the biological process, the accurate chronological order of events in plant pollination and fertilization is A, B, C, D, E.
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