General Science PYQ – Genetics, Evolution and Biotechnology – Part 2 (Q 27–52)
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In IVF the sperm and ovum fuse outside the body in a laboratory culture medium, and the embryo is later implanted in the uterus.
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General Science PYQ – Genetics, Evolution and Biotechnology – Part 2 (Q 27–52) – 25 questions, subject: Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.
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1.
Bursar 2023
Germ plasm theory was proposed byCorrect Answer: B [August Weismann]
Explanation:
August Weismann's germ plasm theory holds that only the germ plasm in reproductive cells passes to the next generation, not changes in body cells.
2.
Jailor 2023 · Combined Research Assistant 2023 · District Educational Officer 2023
In evolution, "use and disuse theory" was proposed byCorrect Answer: C [Lamarck]
Explanation:
Lamarck proposed the theory of use and disuse and inheritance of acquired characters in Philosophie Zoologique (1809).
3.
CSSS 2023
Natural selection theory was proposed byCorrect Answer: C [Charles Darwin]
Explanation:
Charles Darwin, together with Alfred Russel Wallace, proposed the theory of natural selection, in which the fittest survive.
4.
Bursar 2023
'The origin of species' book written byCorrect Answer: C [Darwin]
Explanation:
On the Origin of Species (1859) was written by Charles Darwin.
5.
Combined Research Assistant 2023
Darwin, during his voyage in 1835 studied the Flora and Fauna ofCorrect Answer: C [Galapagos Islands]
Explanation:
During the voyage of HMS Beagle, Darwin studied the flora and fauna of the Galapagos Islands in 1835, notably the finches.
6.
Group 1 2021
According to Darwin, speciation is effected byCorrect Answer: A [small continuous heritable variation]
Explanation:
According to Darwin, small continuous heritable variations accumulate through natural selection over generations to form new species.
7.
Group 1 2022
Alterations in the environments represent selective pressures upon the population to which it must adjust. This statement infers thatCorrect Answer: B [Organisms which fail to adjust to the changed environment must vanish]
Explanation:
Environmental change acts as selective pressure, so organisms that fail to adjust to the changed environment are eliminated.
8.
CTS (Interview Posts) 2024
Gene pool refers toCorrect Answer: A [Sum total of genes in a Mendelian population]
Explanation:
The gene pool is the sum total of all genes and alleles in a Mendelian (interbreeding) population.
9.
Junior Scientific Officer 2023
Genetic drift is also called asCorrect Answer: A [Sewall Wright effect]
Explanation:
Random change in allele frequency in small populations is genetic drift, also called the Sewall Wright effect.
10.
Populations that occupy separate geographical areas. Because of their geographical separation, they can not interbreed, but would be expected to do so if the geographic barrier between them were removed. The separated populations evolve independently and adapt to their respective environments, generating reproductive barriers between them as a result of their separate evolutionary paths.
This passage is insisting.
Asst. Professor (Psychology) 2023
Read the following passage and answer the item that follows.Populations that occupy separate geographical areas. Because of their geographical separation, they can not interbreed, but would be expected to do so if the geographic barrier between them were removed. The separated populations evolve independently and adapt to their respective environments, generating reproductive barriers between them as a result of their separate evolutionary paths.
This passage is insisting.
Correct Answer: A [Allopatric speciation]
Explanation:
Populations separated by geographical barriers evolve independently into new species, which is allopatric speciation.
11.
Junior Analyst 2023
While some predators learn to avoid eating certain potential prey because of their coloration, other species have evolved mechanisms to imitate this coloration to avoid being eaten, even though they themselves may not be unpleasant to eat or contain toxic chemicals. This phenomenon is calledCorrect Answer: C [Mimicry]
Explanation:
When a harmless species resembles a distasteful or toxic one in colour or form to escape predators, it is called mimicry.
12.
AD Town & Country Planning 2022
The fundamental similarity of structures between one part of an animal and other part of the same animal is called asCorrect Answer: A [Serial Homology]
Explanation:
Similarity in basic structure between different parts of the same animal, such as segmented appendages, is serial homology.
13.
Group 3A 2023
Caudal Vertebrae and Vermiform appendix are example forCorrect Answer: D [Vestigial organs]
Explanation:
Caudal vertebrae and the vermiform appendix are functionless remnants in humans, so they are vestigial organs.
14.
Accounts Officer (Treasury) 2022
The fossil of Java-Ape-Man Pithecanthropus erectus was discovered byCorrect Answer: D [Dubois]
Explanation:
The Java ape-man Pithecanthropus erectus (now Homo erectus) fossil was discovered by Eugene Dubois in 1891.
15.
Library Service 2023
Mule is a hybrid ofCorrect Answer: D [Horse and Donkey]
Explanation:
A mule is the hybrid offspring of a male donkey and a female horse, and is usually sterile.
16.
Junior Rehabilitation Officer 2023
The term 'Emasculation' refers toCorrect Answer: B [Removal of anthers]
Explanation:
Emasculation is the removal of anthers from a bisexual flower before they burst, to prevent self-pollination in hybridisation.
17.
(a) Polyethyleneglycol – 1. Herbicide
(b) Bt Toxin – 2. Stress Tolerance
(c) Glyphosate – 3. Insecticide
(d) Proline – 4. Cell Fusion
Group 1 2022
Match the following:(a) Polyethyleneglycol – 1. Herbicide
(b) Bt Toxin – 2. Stress Tolerance
(c) Glyphosate – 3. Insecticide
(d) Proline – 4. Cell Fusion
Correct Answer: D [4 3 1 2]
Explanation:
Polyethylene glycol is used in cell fusion, Bt toxin is an insecticide, glyphosate a herbicide and proline gives stress tolerance, giving 4 3 1 2.
18.
Assertion [A]: Bacillus thuringiensis formed crystals containing toxic insecticidal protein. But it is not killed by that toxic protein
Reason [R]: Actually the Bt. toxin protein exist as inactive protoxins.
Group 2A Mains Re-Exam 2026
Consider the following statements:Assertion [A]: Bacillus thuringiensis formed crystals containing toxic insecticidal protein. But it is not killed by that toxic protein
Reason [R]: Actually the Bt. toxin protein exist as inactive protoxins.
Correct Answer: C [Both [A] and [R] are true and [R] is the correct explanation of [A]]
Explanation:
Bt toxin crystals are inactive protoxins that become toxic only in the alkaline gut of insects, so the bacterium is not killed and R explains A.
19.
(i) The transgene may be transferred through pollen from genetically modified crops
(ii) Transgenic crops may themselves become persistent weeds
(iii) Crops may damage the environment
Group 2A Mains (Revoked) 2026
Which of the following statements are true about transgenic crops that are harmful to the environment?(i) The transgene may be transferred through pollen from genetically modified crops
(ii) Transgenic crops may themselves become persistent weeds
(iii) Crops may damage the environment
Correct Answer: C [(i), (ii) and (iii)]
Explanation:
Transgenes may spread through pollen, transgenic crops may become persistent weeds and they may damage the environment, so all three statements are true.
20.
GSHA 2021
Which bacterium synthesize biodegradable plastic?Correct Answer: D [Ralstonia]
Explanation:
Bacteria such as Ralstonia eutropha produce polyhydroxybutyrate (PHB), a biodegradable plastic.
21.
Group 2A Mains 2025
Grape cell cultures are rich inCorrect Answer: B [Anthocyanin]
Explanation:
Grape cell cultures produce large amounts of anthocyanin pigments, used as natural food colours.
22.
1. Annealing
2. Extension
3. Denaturation
4. Gel making
Group 2A Mains 2025
Arrange the following events of PCR in the correct order of occurrence:1. Annealing
2. Extension
3. Denaturation
4. Gel making
Correct Answer: D [3, 1, 2, 4]
Explanation:
PCR proceeds by denaturation of the DNA, then annealing of primers, extension by polymerase, and finally gel analysis of the product, i.e. 3, 1, 2, 4.
23.
Group 2A Mains (Revoked) 2026
VNTRs are referred to asCorrect Answer: D [Variable Number of Tandem Repeats]
Explanation:
VNTR stands for Variable Number of Tandem Repeats, which differ between individuals and form the basis of DNA fingerprinting.
24.
Group 2A Mains Re-Exam 2026
Minisatellites are DNACorrect Answer: D [consisting of 10–60 bp long base-pair (repeat units)]
Explanation:
Minisatellites are DNA regions made of tandemly repeated units about 10-60 base pairs long, a type of VNTR.
25.
Group 2A Mains 2025
In the IVF technique, fusion of sperm and ovum takes place inCorrect Answer: C [Culture medium]
Explanation:
In IVF the sperm and ovum fuse outside the body in a laboratory culture medium, and the embryo is later implanted in the uterus.
? Full explanations with tables – General Science PYQ book (₹149): www.shanmugamiasacademy.in/study-materials/tnpsc-general-science-pyq
📘 TNPSC பொது அறிவு அலகு I — பொது அறிவியல் (General Science) – முழுமையான பாடநூல்
Here you get the answer with a one-line explanation. TNPSC பொது அறிவு அலகு I பொது அறிவியல் முழுவதும் · 14 அத்தியாயங்கள் · 260 பயிற்சி வினாக்கள் விடையுடன் · 2 மாதிரித் தேர்வுகள் (50 வினாக்கள்) · 14 மனவரைபடங்கள் · அக்டோபர் 2026 வரையிலான அறிவியல் நடப்பு நிகழ்வுகள்
Get the book – ₹149 More quizzes
› General Science PYQ – Computers, Technology and Scientists – Part 2 (Q 27–51)
› General Science PYQ – Computers, Technology and Scientists – Part 1 (Q 1–26)
› General Science PYQ – Scientific Temper and Scientific Method
› General Science PYQ – Genetics, Evolution and Biotechnology – Part 1 (Q 1–26)
› General Science PYQ – Diseases, Health and Nutrition
› General Science PYQ – Human Physiology
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