CBSE Class 9 Biology Notes for Chapter 3 Diversity in Living Organisms

                CHAPTER 3 DIVERSITY IN LIVING ORGANISMS
 
HIERACRCHY OF CLASSIFICATION- GROUPS
There are five groups/ kingdoms: Monera, Protista, Fungi, Plantae, Animalia
Monera

• No defined nucleus or organelles.
• Mode of nutrition: Autotrophic or heterotrophic
• Includes bacteria, blue green algae, etc.

 
Protista

• Unicellular eukaryotic organisms
• Some organisms use appendages like cilia or flagella for moving around.
• Mode of nutrition: Autotrophic or heterotrophic
• Examples: Unicellular algae, protozoans

 
Fungi

• Heterotrophic eukaryotic organisms
• Use decaying organic material as food and therefore called saprophytes.
• Some fungal species have symbiotic relationship with other life forms  such as algae.

 
Plantae

• Multicellular eukaryotes
• Have cell walls
• Mode of nutrition: Autotrophic
• Divided into 5 groups:
  • Thallophytes
  • Byrophytes
  • Pteridophytes
  • Gymnosperms
  • Anglosperms

 
Animalia

• Multicellular eukaryotes
• Do not have cell walls
• Mode of nutrition: Heterotrophic
• Divided into 10 groups:
  • Porifera
  • Coelenterata
  • Platyhelminthes
  • Nematoda
  • Annelida
  • Arthropoda
  • Mollusca
  • Echinodermata
  • Protochordata
  • Vertebrata