MCQ
Pyramid of numbers is:
- AAlways upright.
- BAlways inverted.
- CEther upright or inverted.
- DNeither upright nor inverted.
Pyramid of number in grassland or forest or pond ecosystem is upright. In parasitic food chain, the pyramid of number is inverted. In an ecosystem dominated by trees, the pyramid of number is spindle shaped/ inverted.
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$Y$ - The diversity of plants and animals is not uniform throughout the world but show a rather uneven distribution.
$Z$ - Species - area relationships was given by Alexander Von Humboldt.
$X -Y -Z$