How fertilization occurs in cycads and Ginkgo?

Explanation

### Step-by-Step Solution for Fertilization in Cycads and Ginkgo

**1. Fertilization in Cycads:**
- In cycads, the fertilization process begins when the pollen grain lands on the ovule.
- The pollen grain germinates and forms a pollen tube that grows towards the archegonium (the female reproductive structure).
- The tip of the pollen tube enters the archegonial chamber and bursts, releasing the contents of the pollen tube.

**Hint:** Remember that the pollen tube is crucial for delivering the sperm to the egg in cycads.
...