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#sexual reproduction

9 public questions tagged with this topic.

Vegetative propagation does NOT include:

Vegetative propagation defined strictly as formation of new plant from somatic organ outside sexual process: bulb comprised of fleshy scale leaves enclosing short stem as in onion and garlic, corm solid compressed stem storing starch in gladiolus, tuber swollen underground stem with axillary buds eyes in potato, rhizome horizontal stem with nodes in ginger, runner stolon in strawberry. These structures originate from meristem and carry preformed buds capable of sprouting under favorable moisture. Seeds, in contrast, derive from double fertilization event where one sperm fertilizes egg forming diploid zygote and second fuses with polar nuclei forming triploid endosperm, producing genetically variable offspring. Therefore inclusion of seeds within vegetative methods inaccurate and distinction influences seed certification, quarantine and propagation protocols for breeding programs. This understanding supports competitive exam preparation for NEET, GATE and CSIR NET concepts linking genotype with phenotype through molecular pathways involving transcription factors, hormones and metabolic enzymes that regulate development, adaptation and reproductive biology in applied breeding programs.

Ref: Hartmann & Kester Principles vegetative vs seed; NCERT Class XII Vegetative Propagation; ICAR Handbook.

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 haploid males and diapausing resting eggs surviving desiccation. Combined capacity for rapid clonal expansion and recombination provides colonization advantage, thus all listed phyla display both modes unlike obligately sexual taxa.

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

Plasmodium completes sexual reproduction in

Plasmodium species causing malaria exhibit heteroxenous life cycle requiring vertebrate intermediate host and invertebrate definitive host. Asexual schizogony occurs in human liver and erythrocytes causing disease manifestations. Sexual phase begins with gametocyte formation ingested during blood meal by female Anopheles mosquito; within midgut gametes fuse forming diploid zygote developing into motile ookinete penetrating epithelium forming oocyst undergoing sporogony producing haploid sporozoites migrating to salivary glands for reinfection. Fertilization and meiosis completion occurs in mosquito, establishing it as definitive host where sexual reproduction culminates.

Ref: CDC Malaria sexual reproduction Anopheles mosquito; Tortora life cycle Plasmodium definitive host female Anopheles sporogony