Question

What is double fertilization?

Hint:

Double fertilization is essential for the formation of the seed in angiosperms.

Answer 1

Step 1: Define double fertilization.
Double fertilization is a process unique to angiosperms where two fertilization events take place.
Step 2: Identify the process.
- One sperm fuses with the egg cell to form the zygote.
- The other sperm fuses with the two polar nuclei to form the triploid endosperm.
Step 3: Conclude.
Double fertilization involves two sperm cells, with one fertilizing the egg and the other forming the endosperm.
Final Answer: \[ \boxed{\text{Fertilization in angiosperms where one sperm fuses with the egg and the other with the two polar nuclei}} \]