Across
- 5. the surrounding white kernel of the coconut is the ...............
- 7. Since two types of fusions, syngamy and triple fusion take place in an embryo sac the phenomenon is termed ............, an event unique to flowering plants.
- 10. fusion of three haploid nuclei is termed ..........
- 13. The ......... after triple fusion becomes the primary endosperm cell (PEC) and develops into the endosperm while the zygote develops into an embryo.
- 15. The primary endosperm cell divides .......... and forms a triploid endosperm tissue.
- 16. After entering one of the synergids, the pollen tube releases the ............... into the cytoplasm of the synergid.
Down
- 1. The coconut water from ............ that you are familiar with, is nothing but free-nuclear endosperm (made up of thousands of nuclei).
- 2. The other male gamete moves towards the two polar nuclei located in the central cell and fuses with them to produce a triploid ........ .
- 3. Endosperm may either be ............by the developing embryo (e.g., pea, groundnut, beans) before seed maturation or it may persist in the mature seed (e.g. castor and coconut) and be used up during seed germination.
- 4. Following double fertilisation, events of endosperm and embryo development, maturation of ovules into and ovary into fruit, are collectively termed post-fertilisation events.
- 6. the endosperm is persistent in ........ like – wheat, rice and maize.
- 8. In the most common type of endosperm development, the PEN undergoes successive nuclear divisions to give rise to ............
- 9. Subsequently cell wall formation occurs and the endosperm becomes .............
- 11. One of the male gametes moves towards the egg cell and fuses with its nucleus thus completing the .......
- 12. Syngamy results in the formation of a diploid cell, the .........
- 14. The cells of this tissue are filled with reserve food materials and are used for the nutrition of the developing .......... .