Question
Fri November 04, 2011 By: Vanshika
 

write the characterstics features of all divisions of plantae kingdom, draw 2 diagram of each?

Expert Reply
Sat November 05, 2011

Ans.7) The kingdom Plantae has been divided into following groups:

i) Thallophyta – They show an undifferentiated plant body and consists of red, gree and brown algae. Algae are of universal occurrence. Their body ranges from unicellular to multicellular colonies, filaments or sheets of cells. Vascular tissues are absent. Nutrition is generally autotrophic (through photosynthesis). Reproduction is vegetative or sexual.

ii) Bryophyta – It consists of liverworts and mosses. They are terrestrial, found in damp, shady places. Their life cycle has a long gametophytic phase and a short sporophytic phase. Liverworts have prostrate thalloid gametophytic body, but mosses have erect body. True roots are absent, but rhizoids presents. Vascular tissues are absent. Nutrition is generally autotrophic (through photosynthesis). Reproduction is vegetative or sexual.

iii)Pteridophyta – They include ferns, horse-tails and club mosses. They occur mainly in cool, shady and moist places. They are mostly terrestrial. They are perennial herbs with stem in the form of rhizome. Fibrous roots present. Their life cycle has a gametophytic phase and a short sporophytic phase. Vascular tissues are present. Nutrition is generally autotrophic (through photosynthesis). Reproduction is vegetative or sexual.

iv) Spermatophyta – They are the most successful terrestrial plants. They produce seeds (fertilized ovules). They are divided into two groups –

a) Gymnosperms –They bear naked seeds and lack flowers. Eg - Pinus, Cycas

b) Angiosperms – They produce seeds enclosed in ovary and flowers are present. Example - Rose, Wheat

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