Class X

Natural polymers are including
  1. Rubber
  2. Polythene
  3. Polyester
  4. Nylon
Bacterial and fungal infections
  1. Are non-infectious diseases
  2. Can be cured by antibiotics
  3. Need to be helped through transmission cycle
  4. None of above
In nerve cells, energy used by carrier-protein is
  1. 0.3
  2. 0.5
  3. 0.7
  4. 0.9
Fish and mammals can not rely upon diffusion alone because
  1. Cells are often deep within their bodies
  2. Cells are metabolically very active
  3. Large requirements for exchange of nutrients and wastes
  4. All of above
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