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Question
Assertion :In angiosperms, endosperm development precedes embryo development. Reason: Double fertilisation ensures that the nutritive tissue is formed before the zygote starts cleaving so that the energy spent on the formation of endosperm does not get wasted.
Assertion :In angiosperms, endosperm development precedes embryo development. Reason: Double fertilisation ensures that the nutritive tissue is formed before the zygote starts cleaving so that the energy spent on the formation of endosperm does not get wasted.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
During double fertilisation in angiosperms, one male gamete fuses with
the egg to form the diploid zygote (syngamy or generative
fertilisation). The diploid zygote finally develops into embryo. The
other male gamete fuses with the two polar nuclei(or secondary nucleus)
to form the triploid primary endosperm nucleus, PEN (triple fusion or
vegetative fertilisation). double fertilisation ensures that the
nutritive issue is formed before the zygote starts cleaving so that the
energy spent on the formation of endosperm does not go waste in case the
fertilisation fails. Angiosperms are therefore, economical and more
specialised as compared to gymnosperms where a large nutritive female
gametophyte is formed long before fertilisation.So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.
During double fertilisation in angiosperms, one male gamete fuses with
the egg to form the diploid zygote (syngamy or generative
fertilisation). The diploid zygote finally develops into embryo. The
other male gamete fuses with the two polar nuclei(or secondary nucleus)
to form the triploid primary endosperm nucleus, PEN (triple fusion or
vegetative fertilisation). double fertilisation ensures that the
nutritive issue is formed before the zygote starts cleaving so that the
energy spent on the formation of endosperm does not go waste in case the
fertilisation fails. Angiosperms are therefore, economical and more
specialised as compared to gymnosperms where a large nutritive female
gametophyte is formed long before fertilisation.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.
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