A study found a particular heavy metal contaminating a sea. The given illustration depicts organisms existing in the sea.

1. Phytoplanktons
2. Zooplanktons
3. Labio
4. Whale
   

Which flow chart correctly represents the arrangement of organisms in order of increasing concentration of heavy metals in their body?

The concentration of heavy metals in the body of the organisms increases with the increase in trophic level. Since phytoplanktons are present at the lower most trophic level, the concentration of heavy metals in phytoplanktons will be minimum while the concentration of heavy metals in the Whale will be highest as it is present at a higher trophic level. Hence, the correct order of organisms with increasing levels of heavy metals is

1. Phytoplankton < 2. Zooplankton < 3.  Labio < 4. Whale