TLS Online TPP Program
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TLS Online TPP Program
#Question id: 39289
#Plant Biotechnology
Q. Assertion:Brassica napus lines carrying Ogura (radish) cytoplasm are highly efficient for commercial growth in cold climates without any modifications.
Reason: The presence of radish chloroplasts in these lines causes chlorophyll deficiency under low temperatures.
TLS Online TPP Program
#Question id: 39290
#Plant Biotechnology
Q. Assertion: Protoplast fusion between CMS B. napus (with radish cytoplasm) and normal B. napus can produce healthy male sterile plants.
Reason: The resulting cybrids can retain the radish mitochondria (for CMS) while replacing the radish chloroplasts with B. napus chloroplasts.
TLS Online TPP Program
#Question id: 39291
#Plant Biotechnology
Q. Assertion: In plant breeding, cytoplasm transfer via somatic hybridization is significantly faster than conventional backcrossing.
Reason: Protoplast fusion can achieve in one year what typically takes 5–6 years through the backcrossing method.
TLS Online TPP Program
#Question id: 39292
#Plant Biotechnology
Q. Assertion: Symmetric hybrids allow for the transfer of genes between species that are sexually incompatible.
Reason: Somatic hybridization bypasses the requirements of pollination and fertilization, enabling fusion between even completely sterile lines like monoploids.
TLS Online TPP Program
#Question id: 39293
#Plant Biotechnology
Q. Assertion: Cybridization enables the creation of unique organelle combinations that cannot be produced through sexual reproduction.
Reason: Somatic fusion allows the mitochondria of one species to be combined with the chloroplasts of another, often resulting in recombinant organellar genomes.
TLS Online TPP Program
#Question id: 39294
#Plant Biotechnology
Q. Assertion: Somatic hybridization is currently the primary method used for the commercial improvement of all major cereal and pulse crops.
Reason: Techniques for protoplast isolation, culture, and fusion are not yet readily available for many important cereals and pulses.