Home |
Search |
Today's Posts |
#1
|
|||
|
|||
Fertilization
Hi. I wondered if anyone could answer a simple question. Once an ova
has been fertilized by the pollen nucleus, I understand that the ovary of the plant becomes the fruit and the ovule becomes a seed. What happens to the other ovum? Also if the ovule becomes the seed, are fruit with multiple seeds (e.g apple) a result of mitosis? Kind regards from a physisist who should probably know better. JB |
#2
|
|||
|
|||
Fertilization
In message om, JB
writes Hi. I wondered if anyone could answer a simple question. Once an ova has been fertilized by the pollen nucleus, I understand that the ovary of the plant becomes the fruit and the ovule becomes a seed. What happens to the other ovum? Also if the ovule becomes the seed, are fruit with multiple seeds (e.g apple) a result of mitosis? Kind regards from a physisist who should probably know better. JB In plants an ovary is a structure divided into one or more locules, each of which contains one or more ovules. The ovary develops into the fruit, and the ovule into the seed. (To complicate the matter, an apple is what is known as a pome, which is a type of false fruit, i.e. a fruit (in the vernacular sense) that is not wholly derived from the ovary. In the case of the apple, the core is the true fruit; IIRC, the flesh of the apple is derived from the base of the flower, which is known as a hypanthium. A pollen grain is composed of two or three cells. The large, the vegetative cell, forms the pollen tube. Within the vegetative cell is to be found either two sperm cells, or a single generative cell, which later divides into two sperm cells. Within an ovule there develops a megasporocyte, which divides into 4 haploid cells. Typically 3 of these degenerate, and the fourth differentiates into the embryo sac, which technically is the female gametophyte, and is composed (mostly) of haploid cells. Only one of these cells is an ovum, which on fertilisation by a sperm cell develops into the embryo. In flowering plants a process called double fertilisation occurs, in which another of the embryo sac cells, typically diploid, is fertilised by the second sperm cell, and develops into the endosperm of the seed. IIRC, the remainder of the ovule develops into the seed coat. -- Stewart Robert Hinsley, ex physicist |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Rabbits and lawn fertilization | Lawns | |||
[IBC] Fertilization Question and Too Much Rain! | Bonsai | |||
proper measuring/method drip system FERTILIZATION | Roses | |||
Is root tab fertilization enough for swords? | Freshwater Aquaria Plants | |||
Sword Fertilization Question | Freshwater Aquaria Plants |