What are phytoplankton ?

In a lake, phytoplankton grow in abundance in

Various stages of succession are given bellow. From that rearrange them accordingly. Find out the type of succession and explain in detail. Reed-swamp stage, phytoplankton stage, shrub stage, submerged plant stage, forest stage, submerged free floating stage and marsh medow stage.

An example for phytoplankton.

Mention any two phytoplankton in pond ecosystem.

Assertion: In a marine aquatic ecosystem, the biomass of phytoplanktons (producers) at any given time, is lower than the biomass of zooplanktons (primary consumers). Reason: Phytoplanktons are consumed almost as rapidly as they are formed and thus have shorter life spans. (a) Assertion and reason, both are correct. Reason is the correct explanation for assertion. (b) Assertion and reason, both are correct. Reason is not the correct explanation for assertion. (c) Assertion is correct but reason is not correct. (d) Reason is correct but assertion is not correct.

Study the following ecological pyramids carefully. Mathc the following statements I,ii and iii with gien pyramidsa, B and C and select the correct answer. (i) Inverted pyramid of biomass depicting small standing crop of phytoplanktons supporintg a large standing crop of zooplanktons (ii) Pyramid of numbers in a grassland ecosytems showing about 6 milion producers. (iii) Upright pyramid of biomass