MadSci Network: Botany
Query:

Re: what do the other ovules which are NOT fertilized become after...

Date: Thu Mar 8 23:29:33 2001
Posted By: David Hershey, Faculty, Botany, NA
Area of science: Botany
ID: 983759422.Bt
Message:

Complete question:

i know that after fertilization, the ovule becomes the seed and the ovum 
becomes the embryo which is inside the seed. but i also know that there can be 
MORE THAN ONE ovules present in ONE ovary, right? so what do these become? do 
they become SEEDS WITHOUT EMBRYO??? then, can the seeds be grown, without 
embryo inside them?!?!?!?!

thanks for ur help!!!!!!!!!!!!!!!!!!!!!!! i appreciate that a lot!!!! :P

Reply:

The ripened or mature ovary is known as the fruit. Fruits often have more than 
one seed, for example apples, pears, beans, tomatoes. 

As an example, for an apple fruit to have its full complement of seeds, a 
separate pollen tube would need to grow into each of the ovules and a sperm and 
egg unite to form a zygote in each of the ovules. Each zygote would develop 
into an embryo. If a fertilization did not occur for a particular apple ovule, 
then a seed could not form. The unfertilized ovule would degenerate, not form a 
seed without an embryo. If you cut open enough apple fruits, you will find they 
do not all the same number of seeds.

There are some plants that form seedless fruits, such as bananas, some 
tomatoes, some cucumbers, seedless watermelons, seedless grapes, cultivated 
pineapples, and some figs. Thus, fruits can form without seed development but 
may require pollination. In seedless grapes, you can find the remains of one 
one or more undeveloped seeds.

A seed without an embryo would not be able to germinate.






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