The correct sequence of plants in a hydrosere is
(a) Volvox → Hydrilla → Pistia → Scirpus →
Lantana → Oak
(b) Pistia → Volvox → Scirpus → Hydrilla → Oak
→ Lantana
(c) Oak → Lantana → Volvox → Hydrilla → Pistia
→ Scirpus
(d) Oak → Lantana → Scirpus → Pistia → Hydrilla
→ Volvox.
(a) Volvox → Hydrilla → Pistia → Scirpus →
Lantana → Oak
(b) Pistia → Volvox → Scirpus → Hydrilla → Oak
→ Lantana
(c) Oak → Lantana → Volvox → Hydrilla → Pistia
→ Scirpus
(d) Oak → Lantana → Scirpus → Pistia → Hydrilla
→ Volvox.