The green algae, which belong to the plant kingdom, are photosynthetic organisms that thrive in freshwater and marine environments, as well as in some moist areas found in the land. They are multicellular and their life cycle undergoes haploid and diploid phases.

Bryophytes are generally small in height because they lack the vascular and other supporting tissues that allow plants to draw water up against the downward pull of gravity.

When plants evolved, they developed a transport system that would help bring the water and nutrients to the different parts of the plants. The vascular tissues, such as xylem and phloem, are responsible for this role. These specialized tissues have the ability to work against the force of gravity.

The term seed is described as the plant embryo that is enclosed in a protective coating. This embryonic plant is the unit of reproduction in flowering plants.

Ferns live suitably in moist or damp places. They favor this kind of environment because it allows them to reproduce. When they undergo fertilization, the water enables the sperm to swim and fertilize the eggs.

The table below shows the structures that are assigned in the diploid and haploid stages within the pine’s life cycle.

The table below shows the structures that are assigned in the diploid and haploid stages within the pine’s life cycle. (Click to see the table)

In seed plants, such as gymnosperms and angiosperms, the embryo develops inside the reproductive structures of plant. Unlike ferns and mosses, seed plants have the ability to reproduce without water.