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STD 12 - 12. ecosystem — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 12. ecosystem1 Mark
MCQ
Select the correct option w.r.t. Age pyramids.
  • ✓
    $a$ - Expanding, $b$ - stable, $c$ - Declining
  • B
    $a$ - stable, $b$ - Expanding, $c$ - Declining
  • C
    $a$ - stable, $b$ - Declining, $c$ - Expanding
  • D
    $a$ - Declining, $b$ - stable, $c$ - Expanding
✓

Answer

Correct option: A.
$a$ - Expanding, $b$ - stable, $c$ - Declining
a
The first graph represents a narrow top and wide base. Thus, it is considered to be expanding. The second graph represents similar width from top to bottom. Thus, it is considered to be stable. The third graph is considered to be declining because it has a wider top and narrow base.

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