Practice Questions

TLS Online TPP Program

#Question id: 40161

Q. Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): C4 plants are photosynthetically more efficient than C3 plants.
Reason (R): C4 plants lack the process of photorespiration due to the concentration of CO₂ at the enzyme site (RuBisCO).
In light of the above statements, choose the correct answer from the options given below:

#Botany

Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.

More Questions

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.

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.