In maize,resistance to stem borer insects is caused by which of the following?

  • A
    High aspartic acid
  • B
    High nitrogen
  • C
    Low sugar content
  • D
    All of the above

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Semi-dwarf varieties of rice were developed from:
$I$. $IR-8$
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$III$. $Jaya$
$IV$. $Sonalika$
Choose the correct options.

The term 'desirable trait' can mean different things for different plants. Justify the statement with suitable examples.

The majority of high-yielding varieties of 'Indian rice' have been developed by crossing which of the following?

Explain variants or mutation as a method of disease resistance.

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