Question

What are the three types of life cycles?

Answer 1

Life cycle:

1. The development stage of the living organism of any species from the beginning to the adult stage is called the life cycle.
2. There are three types of life cycles: Haplontic life cycle, Diplontic life cycle and Haplodiplontic life cycle.

Haplontic life cycle:

1. The multicellular cell is in the haploid stage while the diploid stage is a single cell.
2. The zygotic meiosis occurs.
3. Example: Volvox, Spirogyra, Chlamydomonas.

Diplontic life cycle:

1. The multicellular cell is in the diploid stage.
2. There is the formation of haploid gametes.
3. The gametic meiosis occurs.
4. Example: Fucus, Gymnosperms, Angiosperms

Haplodiplontic life cycle:

1. The multicellular cell is in the diploid and haploid stages.
2. The sporic meiosis occurs.
3. Example: Bryophytes, Pteridophytes.