sample paper questions (class 9th) SA 2 --Biology

The questions which have appeared in the CBSE sample paper
1 Name a man made component which is responsible for depletion of ozone layer.
2 Mention one method by which living organisms influence the formation of soil .
 3List two ways in which water is useful to living organisms.
4Mention any two human activities which would be responsible for air pollution .
5How is Earth's atmosphere different from that of Venus and Mars?
6What is symbiosis ?Name a symbiotic life form .Mention the specific organisms
    which display the symbiotic relationships in this lifeform .
7  (a) Identify two features of chordates .
   (b) In which class would you place organisms which has ---
    (1) a scaly exoskeleton and a bony endoskeleton
     (2) a scaly exoskeleton and lays eggs in water .
8  (a)It is diagnosed that Priti is suffering from Japanese encephalitis ,
which organ of her body is affected  and how does the disease spread ?
(b)How are antibiotics effective in the treatment of some diseases ?
 (c) Will antibiotics help curing priti's disease ? why?
9 (a)Discuss briefly the principle of immunization .
(b) Mention any two diseases which can be prevented by immunization

10 Discuss with the help of suitable examples three ways in which
microorganisms enter human body .
11 Pick the odd one out and justify your answer by giving reasons
1   Ricia ; Marsilea ;  Marchantia ; and Funeria
2 Crocodile ;salamander ; Sparrow and bat
12 With the help of labeled diagram show
(a)Nitrogen cycle in nature .
(b)Describe briefly any two processes involved in cycling
 of nitrogen in the environment .  
                          OR
With help of labeled diagram show the cycling of carbon in nature .What are the two ways in which co₂ is fixed in environment .