What is the advantage of using pollen for fertilization What

What is the advantage of using pollen for fertilization? What is the advantage of having flowers to assist with pollination? What is the advantage of having vascular tissue in a terrestrial environment?

Solution

A. Pollen is a male gamete contains the sperms inside the pollen grains it has to reach the ovule for fertilization.
The pollen can tranfer from one plant to other plant and increase the cross fertilization to decrease inbreeding depression. pollen grains easily transfer by winds, insects etc.,

B.Flowers are bright with showy colors and fragrance to attract the pollinators (bees) which brings down the pollen grains from other plants. Flowers are gives nectars to the pollinators has a reward for their process.

C. During evolution plants started to migrate from aquatic to terrestrial land. In terrestrial land water and lack of support for upright growth is the main challenges for adaptations.
1. In land desiccation happen very quickly so to maintain the moisture content cuticle covers the plant shoot.
Vascular tissuse Xylem uses to transports water and nutrients to all over the plants.In moisture rich environment plants less dependent on vascular tissuse water continuously available for their function.
2. Pholem helps in structural support and makes a palnts to grow upright position to great heights.