info@urfaculty.com

www.urfaculty.com

Govt. Job/ Sarkari Naukri, NEET, CAT, Bank Exam & Study materials

Friday, 27 January 2017

Plant Kingdom : Thallophyta


Eukaryotic, multicellular, chlorophyll containing and having cell wall, are grouped the kingdom Plantae, popularly known as plant kingdom.

Phylogenetic system of classification based on evolutionary relationship is presently used for classifying plants.

Numerical Taxonomy use computer by assigning code for each character and analyzing the features.

Cytotaxonomy is based on cytological information like chromosome number, structure and behavior.

      Chemotaxonomy uses chemical constituents of plants to resolve the confusion.


Thallophyta - Comprises the simplest plants which possess undifferentiated or thallus like forms, reproductive organs sintgle celled called gametangia. It includes only Algae.

Characteristic of Algae

· Plant body is thallus, which may be unicellular, colonial, filamentous or parenchymatous.

·   Usually aquatic but a few are also found in moist terrestrial habitats like tree trunks, wet rocks, moist soil etc.

·    Vascular tissues and mechanical tissues are absent.

·   Reproduction is vegetative by fragmentation, asexual by spore formation (zoospores) and sexual reproduction by fusion of two gametes which may be Isogamous (Spirogyra), Anisogamous (Chlamydomonous) or Oogamous (Volvox).


·   Life cycle is various- haplontic, diplontic or diplohanlontic.
Economic importance-

(i)  A number of brown algae ( Laminaria, Sargassum) are used as food in some countries.

(ii)  Fucus and Laminaria are rich source of Iodine.

(iii)  Laminaria and Ascophyllum have antibiotic properties.

Alginic acid is obtained from Fucus and Sargassum, which is used as emulsions. 


Click here to view complete Chemistry Free Study Materials and Notes for NEET Preparation

Click here to view complete Physics Free Study Materials and Notes for NEET Preparation

Click here to view complete Biology Free Study Materials and Notes for NEET Preparation

Click here to take NEET online practice tests by UrFaculty.com

No comments:
Write comments

Hey, we've just updated our test package. Check'it out here - https://goo.gl/r7FuPT
Join Youth Apps