AIM– Model specimen showing symbiotic association in root nodules of leguminous plants, Cuscuta on host and Lichens
Requirements– Root nodules of Touch-me-not plant/Pea/Gram, Twig of plant on which Dodder (Cuscuta) and Lichens
Principle-The leguminous plants have symbiotic association of Rhizobium bacteria in their root nodules for nitrogen fixation from atmosphere. Dodder or Amarbel or Cuscuta is a parasitic plant on higher plants. Lichens are symbiotic association of Algae and Fungi.
Salient Features–
1. Root nodules of leguminous plants–
-Root nodules of leguminous plants have presence of Rhizobium bacteria.
– Nitrogen is fixed in form of nitrates and nitrites.
-Leguminous plants produce a red-pigment and oxygen carrying protein in their root-nodules.
2. Dodder or Amarbel or Cuscuta–
-It’s a parasitic plant found on other plants.
-Cuscuta take nutrients and water through their special roots called ‘haustoria’ by penetrating the host plant.
-Cuscuta does not have its own chlorophylls.
3. Lichens–
-Symbiotic association between algae and fungi.
-Primary vegetation in temperate regions.
-Found in pollution free areas. So, acts as an indicator of air pollution.
