Match the ecological hierarchy given in Column-$I$ with their explanation in Column-$II$. Choose the correct answer from options given below.
Column-$I$Column-$II$
$a$. Organism$i$. Flora and fauna of a specific climatic zone.
$b$. Population$ii$. Populations of different species of an area.
$c$. Community$iii$. Organisms of same kind inhabiting an area.
$d$. Biome$iv$. Basic unit of hierarchy.

  • A
    $a-iv, b-iii, c-ii, d-i$
  • B
    $a-i, b-ii, c-iii, d-iv$
  • C
    $a-iii, b-iv, c-i, d-ii$
  • D
    $a-iv, b-iii, c-ii, d-i$

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The given human population age pyramid represents..........

Which process allows organisms to protect themselves during stressful environmental conditions?

Match the columns:
Column-$I$ Column-$II$
$(a)$ Earthworm $(i)$ Birth-rate
$(b)$ Succession $(ii)$ Pioneer species
$(c)$ Population rise $(iii)$ Pollination
$(d)$ Ecological services $(iv)$ Saprotrophs

Match the following and select the correct option.
$A.$ Earthworm$(i)$ Pioneer species
$B.$ Succession$(ii)$ Detritivore
$C.$ Ecosystem service$(iii)$ Natality
$D.$ Population growth$(iv)$ Pollination

Comment on the following figures: $I, II$ and $III$. Here,$A, B, C, D, G, P, Q, R, S$ represent different species.

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