Class IX

Interaction and interdependence of plants and animals in a certain place is known as
  1. ecological niche
  2. ecological community
  3. ecological habitat
  4. both A and B
During oxygen (O2) debt, lactic acid (C3H6O3) is removed from
  1. liver
  2. muscles
  3. lungs
  4. mucus
Minimum time required between blood donations is
  1. 1 month
  2. 1 month
  3. 6 months
  4. 9 months
Apple fruit is formed from
  1. a superior ovary
  2. an inferior ovary
  3. stamen
  4. petals of flower
Blood pressure required for ultrafiltration is provided through
  1. a simple mechanical process
  2. afferent arteriole
  3. efferent arteriole
  4. heart beat
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