Question

From the examples of alternation of generations in plants, identify:
Plant species where mitosis is seen in haploid cells.

Answer 1

Part 1: Introduction to alternation of generation
Alternation of the life cycle between diploid and haploid phases or the sporophytic and gametophytic stages in plants is known as alternation of generation.

Part 2: Types of alternation of generation in plants
$\begin{array}{ccc}\text{Type of life cycle}& \text{Description}& \text{Examples}\\ \text{Haplontic}& \text{Haploid gametophytes are dominant and}& \\ & \text{free-living.. Diploid stage is represented}& \\ & \text{by the short-lived zygote}& \text{Algae}\\ \text{Haplo-diplontic}& \text{Sporophytes and gametophytes are}& \\ & \text{multicellular and an intermediate condition exists}& \text{Bryophytes Pteridophytes}\\ \text{Diplontic}& \text{Diploid sporophyte is dominant and}& \\ & \text{independant and the haploid stage is represented by}& \\ & \text{the short-lived gametophyte}& \text{Gymnosperms Angiosperms}\end{array}$

Part 3: Plant species where mitosis is seen in haploid cells
Almost all types of plants undergo mitosis in the haploid cells, few of them are mentioned below:-

• Algae (e.g., Chlamydomonas sp., Spirogyra sp. etc.)
• Bryophytes (e.g., Marchantia sp., Funaria sp., etc.)
• Pteridophytes (e.g., Selaginella sp., Equisetum sp., etc.)
• Gymnosperms (e.g., Cycas sp., Pinus sp., etc.)
• Angiosperms (e.g., Mangifera sp., Triticum sp., etc.)