Clear-cut distinction between vegetative,reproductive,and senescent phases is shown by:

  • A
    All annuals and perennials
  • B
    All biennials and perennials
  • C
    All annuals and biennials
  • D
    All perennials

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In $Ophioglossum$ (a fern),the chromosome number in a gamete is ..... and in potato,the chromosome number in a gamete is ....

Select the incorrect pair:

In which of the following is external fertilization observed?

$A-$ Events after the formation of zygote are called post-fertilization events.
$R -$ In viviparous animals,a young one develops outside the mother's body.

Why is reproduction essential for organisms? Describe its types.

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