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Question

Given below are assertions and reason. Point out:
A. If both are true with reason being the correct explanation
B. Both true but reason not correct explanation
C. Assertion is true but reason is wrong
D. Both assertion and reason are wrong

Assertion: As we go from the lower to the higher forms of the fungal members, there is a decrease in the complexity of the sexual apparatus.
Reason: Sexual reproduction involves plasmogamy, karyogamy and meiosis.

A
A
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B
B
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C
C
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D
D
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Solution

The correct option is B B
In fungi reproduction is of three types - vegetative, asexual and sexual. There are gradual and progressive simplification and ultimate elimination of the sexual apparatus from the lower phycomycetes to higher forms of fungi.

Sexual reproduction in fungi involves three steps - plasmogamy, karyogamy and meiosis. Plasmogamy is the fusion of the cells of the fungi. This leads to a dikaryotic phase where we see two nuclei. Following this is karyogamy, or the fusion of the nuclei to form a diploid zygote. This is followed by meiosis where the diploid zygote gives rise to haploid spores. So, both assertion and reason are true but reason is not the correct explanation.

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