Question

Which division among plants has the simplest organisms?

Answer 1

Hint: According to biology, the division is rank which is equivalent to Phylum. The main division of land plants involved, Marchantiophyta, Anthocerotophyta, Bryophyta, Cycadophyta, Ginkgophyta, Pinophyta, Gnetophyta, Magnoliophyta and Pteridophyta.

Complete answer:
The division ‘Thallophyta’ has the simplest organisms. It is the lowest group of plants. The body structure of members belonging to Thallophyta is generally thalloid, that is, absence of differentiation into root, stem and leaves. Reproductive structures are inconspicuous and vascular conduction tissues are absent. Some members of Thallophyta include Ulothrix, Spirogyra, Cladophora, Volvox Chlamydomonas etc. They have a cell wall composed of cellulose. They have the absence of vascular tissues. Unlike other plants, xylem and phloem are absent. They possess sex organs that are simple and single-celled, and there is no embryo formation after fertilization.

Each group has its own unique and the simplest organisms as they have very simple body design. They do not possess a specific body design. This division includes algae, fungi, bacteria, lichens. The bodies of these organisms are undifferentiated. It lacked the presence of a vascular system that transports water and mineral salts. They possess true roots. Thallophytes are typically found in wet regions. They are autotrophic in nature. They are again classified into two subdivisions they are named as maxothallophyta and euthallophyta.

Note: Body of thallophytes is undifferentiated which implies that their body isn’t separated into leaves, roots and stem. Moreover, they are nonvascular plants i.e., nonattendance of Vascular tissues and zygote meiosis happens in Them. Thallophytes belong to polyphyletic groups of non-mobile organisms that are grouped on the basis of similarity of characteristics but they do not share a common ancestor.