Question

The correct sequence of plants in a hydrosere is

• A. Oak -->Lantana--->Scirpus--> Pistia --> Hydrilla -->Volvox
• B. Volvox-->Hydrilla-->Pistia-->Scirpus-->Lantana-->Oak
• C. Pistia-->Volvox-->Scirpus-->Hydrilla-->Oak-->Lantana
• D. Oak-->Lantana-->Volvox-->Hydrilla-->Pistia-->Scirpus

Answer 1

The correct option is B Volvox-->Hydrilla-->Pistia-->Scirpus-->Lantana-->Oak

A succession originates in a water body is called hydrosere or hydrach succession.
In primary succession in water, the pioneers are the small
phytoplanktons, then followed by rooted hydrophytes and rooted floating, sedges, grasses and finally the trees. The climax again would be a forest. With time the water body is converted into land.
So the correct order is
Volvox (phytoplankton) --> Hydrilla (rooted submerged stage) --> Pistia ( rooted floating) --> Scripus (reed swamp) ---> Lantana ( Marsh meadow) --> Oak ( Scrub stage)