Class X

Steep diffusion gradient is maintained by
  1. Diffusion
  2. Respiration
  3. Ventilation
  4. Transpiration
Anabolism and catabolism are types of
  1. Chemical reaction
  2. Chain reactions
  3. Metabolism
  4. Complex reactions
 Acetabularia mediterranea has a cap of
  1. Regular shape
  2. Circular shaperegular shape
  3. Triangular shape
  4. Cone shape
Skeleton of sponges is composed of needle-like structures called
  1. Spicules
  2. Ostia
  3. Osculum
  4. Spongecoel
 Ribs are elevated when muscles between ribs are
  1. Relaxed
  2. Contracted
  3. Dilated
  4. Expanded
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