Class XI · Biology practice

Biological Classification MCQs

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300 questions in this collection · Page 24 of 30

Question 231 of 300

📘 CLASS XI

Biological Classification

Assertion (A): In Ascomycetes and Basidiomycetes, a dikaryotic stage (n+n) occurs during sexual reproduction.

Reason (R): Fusion of two haploid cells in these fungi does not immediately result in a diploid cell.

Delayed karyogamy results in an intervening dikaryotic stage.

Question 232 of 300

📘 CLASS XI

Biological Classification

Assertion (A): Members of Phycomycetes have a branched and septate mycelium.

Reason (R): Asexual reproduction in Phycomycetes takes place by motile zoospores or non-motile aplanospores.

Phycomycetes possess aseptate coenocytic mycelium. They reproduce asexually by zoospores or aplanospores.

Question 233 of 300

📘 CLASS XI

Biological Classification

Assertion (A): Rhizopus and Albugo belong to the class Phycomycetes.

Reason (R): Albugo is a parasitic fungus that grows on mustard plants.

Both fungi belong to Phycomycetes, but Albugo's parasitic habit does not explain the classification.

Question 234 of 300

📘 CLASS XI

Biological Classification

Assertion (A): Ascomycetes are commonly known as sac-fungi.

Reason (R): Their sexual spores, called ascospores, are produced endogenously in sac-like asci.

Ascomycetes derive their name from the sac-like asci in which ascospores are formed.

Question 235 of 300

📘 CLASS XI

Biological Classification

Assertion (A): Neurospora is extensively used in biochemical and genetic work.

Reason (R): Neurospora is a unicellular member of the Basidiomycetes.

Neurospora is a multicellular ascomycete, not a unicellular basidiomycete.

Question 236 of 300

📘 CLASS XI

Biological Classification

Assertion (A): In Basidiomycetes, true sex organs are absent.

Reason (R): Plasmogamy is brought about by the fusion of two vegetative or somatic cells of different strains.

The reason describes reproduction in Basidiomycetes but does not explain the absence of sex organs.

Question 237 of 300

📘 CLASS XI

Biological Classification

Assertion (A): Basidiospores are produced exogenously on the basidium.

Reason (R): Karyogamy and meiosis take place inside the basidium to produce four basidiospores.

Karyogamy followed by meiosis in the basidium gives rise to four exogenous basidiospores.

Question 238 of 300

📘 CLASS XI

Biological Classification

Assertion (A): Deuteromycetes are commonly known as imperfect fungi.

Reason (R): Only the asexual or vegetative phases of these fungi are currently known.

The absence of a known sexual stage is why they are termed imperfect fungi.

Question 239 of 300

📘 CLASS XI

Biological Classification

Assertion (A): The Deuteromycetes reproduce sexually by producing ascospores.

Reason (R): The mycelium of Deuteromycetes is septate and branched.

Deuteromycetes reproduce only asexually by conidia, although their mycelium is branched and septate.

Question 240 of 300

📘 CLASS XI

Biological Classification

Assertion (A): Bladderwort and Venus fly trap are partially heterotrophic.

Reason (R): They are insectivorous plants that consume insects to supplement their nutrition.

These insectivorous plants supplement mineral nutrition by trapping insects while remaining photosynthetic.

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