Plant Kingdom

Diksha Bhatla

Plant Kingdom

23 May 2022

notes not found for this lesson
do you want add your own notes? start create a note on General Science

Quiz not available for this lesson..

Questions

Questions not available for this lesson..

Introduction

The plant kingdom includes algae, bryophytes, pteridophytes, gymnosperms, and angiosperms. Algae are chlorophyll-bearing simple, thalloid, autotrophic, and largely aquatic organisms. Depending on the type of pigment possessed and the type of stored food, algae are classified into three classes, namely Chlorophyceae, Phaeophyceae, and Rhodophyceae.

Algae usually reproduce vegetatively by fragmentation, asexually by the formation of different types of spores, and sexually by the formation of gametes which may show isogamy, anisogamy, or oogamy.

Bryophytes are plants that can live in soil but are dependent on water for sexual reproduction. Their plant body is more differentiated than that of algae. It is thallus-like and prostrate or erect and attached to the substratum by rhizoids. They possess root-like, leaf-like, and stem-like structures.

The bryophytes are divided into liverworts and mosses.

The plant body of liverworts is thalloid and dorsiventral whereas mosses have upright, slender axes bearing spirally arranged leaves.

The main plant body of a bryophyte is gamete-producing and is called a gametophyte. It bears the male sex organs called antheridia and female sex organs called archegonia. The male and female gametes produced fuse to form a zygote which produces a multicellular body called a sporophyte. It produces haploid spores. The spores germinate to form gametophytes.

1

Prakash Joshi 1 Year ago

More notes will be added on this chapter

0 Reply 0

Sign-in to continue

Plant Kingdom

Plant Kingdom

Questions

Introduction

comments 1

1