Q.85 Which one of the following animals has “Book Lungs” as a respiratory organ?(A) Earthworm(B) Scorpion(C) Octopus(D) Starfish Scorpion is the correct answer (Option B). Book lungs serve as the […]
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GATE Life Science 2023 Previous Year Papers with Solutions
Bacterial Generation Time Calculation
Q.84 During the exponential growth, it took 6 hours for the population of bacterial cellsto increase from 2.5 × 106 to 5 × 108. The generation time of the bacterium,rounded […]
GATE Life Science 2023 Previous Year Papers with Solutions
Distinguishing Spontaneous and Induced Mutations in Bacteria
Q.83 The spontaneous, and induced mutations in bacteria can be distinguished by(A) fluctuation test(B) replica plating(C) disc diffusion test(D) use–dilution test Correct Answer: (A) fluctuation test The fluctuation test distinguishes […]
GATE Life Science 2023 Previous Year Papers with Solutions
Primary and Secondary Adaptive Immune Responses to Antigens
Q.82 Which of the following statements about the primary and secondary adaptiveimmune responses to an antigen is/are correct?(A) IgM antibodies appear first in response to the initial exposure of the […]
GATE Life Science 2023 Previous Year Papers with Solutions
Antibiotics Isolated from Streptomyces spp
Q.81 Which of the following antibiotics is/are isolated from Streptomyces spp.?(A) Gentamicin(B) Nystatin(C) Polymyxins(D) Tetracyclines Gentamicin, Nystatin, and Tetracyclines are isolated from Streptomyces spp., while Polymyxins are not. The correct […]
GATE Life Science 2023 Previous Year Papers with Solutions
Non-Membrane Bound Inclusion Bodies in Prokaryotes
Q.80 Which of the following is/are non–membrane bound inclusion bodies?(A) Carboxysomes(B) Cyanophycin granules(C) Poly–β–hydroxybutyrate granules(D) Polyphosphate granules The correct answer is (B), (C), and (D). Carboxysomes (A) are membrane-bound (protein […]
GATE Life Science 2023 Previous Year Papers with Solutions
Which Genus is Spirochete
Q.79 Which of the following genus is/are a spirochete(s)?(A) Borrelia(B) Leptospira(C) Spirulina(D) Treponema Answer: (A), (B), and (D) Spirochetes belong to the phylum Spirochaetota, featuring Gram-negative, helical bacteria with axial […]
GATE Life Science 2023 Previous Year Papers with Solutions
Bacterial Conjugation Merozygote Formation
Q78 Which one of the following conjugations will result in formation of merodiploid? (A) F– donor × F– recipient (B) Hfr donor × F– recipient (C) F+ donor × F– […]
![Q.77 Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. Assertion [a]: Endospore can survive heat that would rapidly kill vegetative cells of the same species. Reason [r]: In endospore, the protoplasm is reduced to minimum volume as a result of the accumulation of calcium-dipicolinic acid complexes and small acid-soluble spore proteins, which forms a cytoplasmic gel and a thick cortex. (A) Both [a] and [r] are true and [r] is the correct reason for [a] (B) Both [a] and [r] are true and [r] is not the correct reason for [a] (C) Both [a] and [r] are false (D) [a] is true but [r] is false](https://www.letstalkacademy.com/wp-content/uploads/2025/12/slide_77-2.png)
GATE Life Science 2023 Previous Year Papers with Solutions
Endospore Heat Resistance
Q.77 Determine the correctness or otherwise of the following Assertion [a] and theReason [r].Assertion [a]: Endospore can survive heat that would rapidly kill vegetative cells ofthe same species.Reason [r]: In […]
GATE Life Science 2023 Previous Year Papers with Solutions
First Labeled Metabolite Calvin Cycle
Q.76 A suspension of photosynthetic green algae was illuminated in the presence of14CO2 for few seconds. The first metabolite in the Calvin cycle to be radiolabeledwill be(A) glyceraldehyde(B) 1,3–bisphosphoglycerate(C) 3–phosphoglycerate(D) […]
