Question

Using the format given below, explain the process of double fertilization in flowering plants.
Points to focus on :
1. Quality of diagram
2. Using key terms
3. Elaboratively explaining the process
4. Presentation of the work

Answer 1

Answer:

The pollen tube releases two male gamete into the embryo sac.

One of the male gamete fuses with egg to form diploid zygote. This is called

syngamy.

 The second male gamete fuses with two polar nuclei to produce triploid endosperm

nucleus(PEN). As this involves the fusion of three haploid nuclei it is termed as triple

fusion.

 Since two types of fusion takes place in an embryo sac the phenomenon is called

double fertilization.

 PEN develops into endosperm and zygote develops into embryo

POST FERTILISATION EVENTS:

1. Endosperm development

2. Embryo development

3. Maturation of ovule into seed

4. Maturation of ovary into fruit