To what is the "double" part of double fertilization in flowering plants referring?
A)Two sperm penetrate and fertilize the egg at the same time.
B)Two sperm fertilize one egg each,producing two embryos.
C)One sperm fertilizes the egg to form the embryo,and,after several cell divisions,a second sperm fertilizes the same egg forming another embryo.
D)There are two fusion events involving separate sperm: one fuses with the egg forming an embryo,the other with a cell to form the endosperm.

Question

Quizplus · Accepted Answer

The "double" part of double fertilization refers to the fact that there are two fusion events involving separate sperm in flowering plants. One sperm fuses with the egg to form the embryo, while the other sperm fuses with a cell to form the endosperm. This process produces two distinct structures: the embryo and the endosperm, which provide nutrients for the developing embryo. Option A is incorrect because only one sperm penetrates and fertilizes the egg. Option B is incorrect because each egg is fertilized by only one sperm, resulting in a single embryo. Option C is incorrect because it suggests that one egg can produce two embryos, which is not the case in flowering plants.

To What Is the "Double" Part of Double Fertilization in Flowering