May you please help me with a short answers please. Also I dont need explanation
ID: 199275 • Letter: M
Question
May you please help me with a short answers please. Also I dont need explanation for the answer. Thank you. The Female Gametophyte In the ovule, a megaspore undergoes three mitotic divisions to produce a seven-celled (eight-nuclei) female gametophyte called an embryo sac (Fig. 15.11). One of these cells is an egg cell. The largest cell contains two polar nuclei. Figure 15.11 Embryo sac in a lily ovule. An embryo sac is the female gametophyte of flowering plants. It contains seven cells, one of which is the egg. The each cell is noted. © w.P. Armstrong 2004 fate of 3 antipodal cells disintegrate 2 polar nuclel plus a sperm become 3n endosperm egg following 2 synergid cells help guide the pollen tube becomes embryo 400x Observation: Embryo Sac Slide Examine the demonstration slide of the mature embryo sac of Lilium. Identify the egg labeled in Figure 15.11. Answer these questions. 1. What portion of the embryo sac tells you that it is the female gametophyte? 2. When the pollen tube delivers sperm to the embryo sac, double fertilization occurs. Due to double fertilization, what happens to the egg? What happens to the polar nuclei? 3. Following fertilization, the ovules develop into seeds, and the ovary develops into the fruit. What are the three parts of a seed (as shown in Figure 15.10)?Explanation / Answer
1. Egg portion. As the embryosac contain Egg along with two synergid cells. This portion gives idea about it's female gametophyte nature
2. Egg developed as Zygote, followed by Embryo . Where as polar nuclei produce Endosperm which provides nutrition to the developing embryo
3. Seed contain outer layer of Seed coat, beneath this Endosperm. Inner to this Cotylidons present. These are the three parts of the Seed