Given below are four statements $(a-d)$ each with one or two blanks. Select the option which correctly fills the blanks in two statements.
$(a)$ Ecological succession is a ...$(i)$... and fairly predictable change in the ...$(ii)$... of a given area.
$(b)$ In ecological succession,the entire sequence of communities that successively change in a given area is called ...$(i)$....
$(c)$ Primary succession occurs on ...$(i)$....
$(d)$ Secondary succession is ...$(i)$... than primary succession.

  • A
    $(a)-(i)$ gradual,$(ii)$ species composition; $(b)-(i)$ Sere
  • B
    $(b)-(i)$ Climax; $(c)-(i)$ Newly cooled lava,bare rock
  • C
    $(a)-(i)$ fast,$(ii)$ species composition; $(c)-(i)$ Cut forests
  • D
    $(c)-(i)$ Lands that have been flooded; $(d)-(i)$ slower

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Fill in the blanks.
$(a)$ Plants are called as . . . . . . because they fix carbon dioxide.
$(b)$ In an ecosystem dominated by trees,the pyramid (of numbers) is . . . . . . type.
$(c)$ In aquatic ecosystems,the limiting factor for the productivity is . . . . . . .
$(d)$ Common detritivores in our ecosystem are . . . . . . .
$(e)$ The major reservoir of carbon on earth is . . . . . . .

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