Class IX

For excretion, animals with impermeable skin use
  1. simple diffusion process
  2. produce concentration gradient
  3. special excretory glands
  4. special excretory organs
Mycelia is formed through thread like structures called as
  1. cilia
  2. hypha
  3. hydra
  4. flagella
If heat loss center is activated in hypothalamus, control mechanism include all but
  1. vasodilation
  2. rapid breathing
  3. lower metabolic activity
  4. lesser convection
In any ecosystem, ultimate source of energy is
  1. plants as primary consumers
  2. sun as radiant energy
  3. secondary consumer
  4. heterotroph
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