Practice Questions

TLS Online TPP Program

#Question id: 4699

The theory of evolution is most accurately described as

#Zoology

an educated guess about how species originate.
one possible explanation, among several scientific alternatives, about how species have come into existence.
an opinion that some scientists hold about how living things change over time.
an overarching explanation, supported by much evidence, for how populations change over time.

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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.

TLS Online TPP Program

#Question id: 39295

#Plant Biotechnology

Q. Assertion: Chromosome elimination in somatic hybrids is a highly predictable process used for precise gene mapping.

Reason: Genetic instability is a common limitation in somatic hybrids, particularly in wide interfamilial crosses, often resulting in abnormal or sterile plants.