Long-term cultural evolution in humans is largely based on a scale of ...... .

  • A
    The ability of humans to alter their fertility.
  • B
    Increase in food production.
  • C
    Colonization of sparsely populated areas.
  • D
    Control of human diseases.

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New varieties of plants can be produced by:

Heterosis (hybrid vigor) is desirable in vegetatively propagated plants because...

Heterosis is . . . . . . .

Which organisms are primarily included as pests?

Match the following columns:
Column-$I$ (Crop) Column-$II$ (Variety) Column-$III$ (Resistance to Disease)
$P$. Wheat $I$. Pusa Swarnim $W$. White rust
$Q$. Brassica $II$. Pusa Komal $X$. $CMV, TMV$ and Leaf curl
$R$. Cowpea $III$. Himgiri $Y$. Bacterial blight
$S$. Chilli $IV$. Pusa Sadabahar $Z$. Leaf and stripe rust

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