CBSE ADDA

Animal kingdom: It consists of organisms which are eukaryotic, multicellular and heterotrophic. Their ells do not have cell-walls. Most animals are mobile. Animal kingdom classified on the basis of the following points: Arrangement of cells, body symmetry, nature of coelom, patterns of digestive, circulatory or reproductive systems KINGDOM ANIMALIA Animalia  are further classified as Non- Chordates( Porifera, Coelenterata, Platyhelminthes , Nematoda, Annelida, Arthropoda, Mollusca, Echinodermata) and Chordates { Protochordata, Vertebrata ( Pisces, Amphibians, Reptilia, Aves, Mammalia)} Non- Chordates  Porifera: Organisms of this group have holes or ‘pores’, all over the body and therefore known as sponges. They are mainly found in marine habitats Pores helps in circulating water throughout the body to bring in food oxygen and removal of waste. They are hermaphrodite i.e., eggs and sperms are produced by the same individual. Sponges reproduce asexu...

Plants Kingdom           Question: 1. Why do we classify organisms?   Answer:- we classify organisms to understand characteristics of life form on the earth. Question: 2. Give three examples of the range of variations that you see in life forms around you. ·       Answer:- Three examples of the range of variations in life forms: ·          Bacteria is microscopic where as Red wood tree is giant ·          pine trees live for years where as mosquito for few days ·          Variety of flower having different colors Question: 3. which do you think is a more basic characteristic for classifying organisms? (a) The place where they live.   (b) The kind of cells they are made of. Why? Answer: The kind of cells an organism is made of is more basic characteri...

Clich here to get solution of 9th psa 2015  Students who appeared for CBSE PSA 2015 can check the Answer Key for PSA Exam here for their question paper set. We will upload the answer keys of all question papers for both class 9 and class 11here. The answers for 9 th ninth PSA SET D-3 1 3 3 4 4 4 4 4 4 2 4 2 4 1 2 2 4 2 3 3 3 4 1 2 2 4 2 1 3 3 2 4 4 2 1 3 2 2 1 4 4 3 2 1 4 2 3 4 3 4 1 1 3 4 1 3 1 3 4 ...