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#asexual reproduction

16 public questions tagged with this topic.

General Biology

Which of the following statements represent correct features of sexual and asexual modes of reproduction in flowering pl

The principle of plant biotechnology explains that photosynthetic engineering and nutrient pathways support biofortification. Hence i, iii and iv fits best because it supports metabolic engineering in crops, as documented in authoritative sources on plant biology.

Ref: Taiz et al., Plant Physiology and Development, 6th Edition, Chapter 7, Photosynthesis, discusses light reactions, Calvin cycle and metabolic engineering examples like Golden Rice providing insight into plant biotechnology.

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Plant Breeding 2

Apomixis refers to:

Apomixis signifies alternative reproductive pathway where seeds form without meiosis and syngamy, producing offspring clonal to maternal parent preserving heterozygosity and hybrid genotype. Developmental routes include apospory where embryo sac initiates from somatic nucellar cell bypassing megaspore mother cell differentiation, diplospory where megaspore mother cell undergoes mitosis instead of meiosis forming unreduced embryo sac, and adventitious embryony where embryo develops directly from nucellar tissue. Unreduced egg cell then develops parthenogenetically via activation of egg cell tra

Ref: Bicknell & Koltunow Annu Rev Plant Biol apomixis mechanisms; Carman et al Apomixis genetics; NCERT Biology Apomixis introduction.

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Plant Breeding 1

Asexual reproduction in plants produces:

Asexual reproduction in higher plants bypasses syngamy, producing progeny via mitotic divisions from somatic tissues, preserving maternal genotype intact except somatic mutations. Modes include vegetative propagation through runners, rhizomes, suckers, tubers, bulbs, corms and apomictic seed formation via nucellar embryony where diploid nucellar cells develop into embryos without meiosis. Because meiosis absent, segregation does not occur and heterozygosity fixed, resulting in clones that are phenotypically uniform. Meristematic activity regulated by cytokinin-auxin balance induces adventitiou

Ref: Hartmann & Kester Plant Propagation Asexual cloning; NCERT Class XII Reproduction chapter; Acquaah Clonal crops.

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Fungi - Phycomycetes Ascomycetes Basidiomycetes

Which group of fungi is commonly known as “imperfect fungi” because only its asexual or vegetative phases are known?

Deuteromycetes are called imperfect fungi because only their asexual or vegetative phases are known. When their sexual forms are discovered, they are moved to the fungal classes to which they correctly belong.

Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Fungi - Phycomycetes Ascomycetes Basidiomycetes

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Fungi - Phycomycetes Ascomycetes Basidiomycetes

Only the asexual and vegetative phases of a fungus are known, and it reproduces by conidia. What should happen if its se

Deuteromycetes include fungi for which only the asexual or vegetative stages are known. When the sexual stage is discovered and its relationship is established, the fungus is moved to the appropriate fungal class, often Ascomycetes or Basidiomycetes.

Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Fungi - Phycomycetes Ascomycetes Basidiomycetes

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Animal Classification

Which group shows both sexual and asexual reproduction?

Both sexual and asexual strategies occur widely demonstrating evolutionary flexibility: Cnidaria reproduce asexually by budding, fission, pedal laceration and stolon extension while medusae and polyps release gametes sexually, showing generational alternation metagenesis. Ctenophora hermaphroditic individuals broadcast gametes but some benthic platyctenids undergo fragmentation and dissogony where larva matures precociously reproducing before adult form. Rotifera exhibit heterogonic cycle with amictic parthenogenesis producing diploid females rapidly colonizing, mictic sexual phase yielding ha

Ref: NCERT Class 11 Biology, Chapter 4: Asexual and sexual reproduction Cnidaria Ctenophora Rotifera

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Animal Classification

Most ectoprocts reproduce asexually to form

Primary mode of propagation and colony expansion in ectoprocts involves asexual budding where daughter zooids bud from parental body wall producing interconnected zoarium of polymorphic zooids specialized for feeding, defense, reproduction and support. Budding generates modular growth optimized for sessile filter feeding maximizing space capture. Sexual reproduction also present producing cyphonautes triangular shelled or coronate non-feeding larvae settling to form ancestrula founding new colony. Freshwater phylactolaemates additionally produce statoblasts as dormant chitinous propagules high

Ref: Ruppert et al., Invertebrate Zoology, Chapter 23: Bryozoa budding colony formation

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