TLS Online TPP Program
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TLS Online TPP Program
#Question id: 39287
#Plant Biotechnology
Q. Assertion: Cybridization is a valuable tool for transferring traits like cytoplasmic male sterility (CMS) and herbicide resistance in crops like rice and tobacco.
Reason: Cybrids contain the nuclear genome of only one species, which ensures the plant retains its primary species characteristics while gaining specific cytoplasmic traits.
TLS Online TPP Program
#Question id: 39288
#Plant Biotechnology
Q. Assertion: Cybrids allow for the combination of mitochondria from one species with chloroplasts from a different species.
Reason: This combination can be used to overcome deleterious effects, such as chlorophyll deficiency, found in some alloplasmic lines.
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.