Question

Which of the following divisions of plants does NOT have a well-differentiated body?
1. Bryophyta
2. Thallophyta
3. Gymnosperms
4. Pteridophyta

Answer 1

Correct Answer - Option 2 : Thallophyta

The correct answer is Thallophyta.

• Thallophyta- The plants in this group are commonly called algae.
• The form and size of algae are highly variable.
• The algae reproduce by vegetative, asexual, and sexual methods.
• Vegetative reproduction is by fragmentation.
• Each fragment develops into a thallus.

 

• Bryophyta- Bryophyta includes the various mosses and liverworts that are found commonly growing in moist shaded areas in the hills.
  • Bryophytes are also called amphibians of the plant kingdom because these plants can live in soil but are dependent on water for sexual reproduction.
  • They play an important role in plant succession on bare rocks/soil.
• Gymnosperms- The gymnosperms are plants in which the ovules are not enclosed by any ovary wall and remain exposed, both before and after fertilization.
  • This term is made from two Greek words Gymno means naked and Sperma means seed.
• Pteridophyta- In Pteridophytes, the main plant body is a sporophyte which is differentiated into true root, stem, and leaves.
  • The leaves in Pteridophyta are small (microphylls) as in Selaginella or large (macrophytes) as in ferns.
  • They are also frequently grown as ornamentals. Evolutionarily, they are the first terrestrial plants to possess vascular tissues-xylem and phloem.