Evolution
CBSE Class 12 Biology · every board question from this chapter, 2023–2026 · 1 of them repeated across years
- Caenorhabditis elegans is a nematode which is2026
- What conclusion can be drawn if the forelimbs of an aquatic animal and a terrestrial animal have similar anatomical structure?2026
- Appearance of antibiotic-resistant bacteria is an example of evolution due to:2026
- Name the extinct ancestor of humans who ate only fruits and hunted with stone weapons.2026
- Arrange the following in the correct sequence of their evolution and select the correct option: (i) Seaweed (ii) Invertebrates…2026
- Identify the statements that correctly describe Darwin's Theory of Evolution. (i) Overproduction of organisms leads to…2026
- Which one of the following evidences does not support Darwin's theory of natural selection?2026
- Which type of selection is industrial melanism observed in moth, Biston betularia?2026
- The given diagram shows the skulls of two different mammals. Which of the following options accurately describes the differences…2026
- The idea of use and disuse of organs for evolution of organism was proposed by2026
- Select the odd option in the context of convergent evolution.2026
- Assertion: When we see stars, we are apparently peeping into the past. Reason (R): What we see today is an object whose emitted…2026
- Assertion: The population of melanized moths increased in industrial areas after Industrial Revolution. Reason (R): In Industrial…2026
- Assertion: Fossils provide direct evidence for evolution. Reason (R): Fossils help to trace evolutionary relationships among…2026
- Assertion: Under a particular set of selection pressure, organisms evolve towards the most efficient reproductive strategy.…2026
- Assertion: Hardy-Weinberg principle says that allele frequencies in a population are stable. Reason (R): Hardy-Weinberg principle…2026
- (i) Rearrange the following in correct order of their appearance on Earth between 2 million years and 40,000 years ago: Homo…2026
- (i) Mention any two characteristics of Neanderthal man that lived near East and Central Asia. (ii) Identify the following…2026
- Explain the mutually rewarding relationship between Yucca plant and species of moth. OR Pollination success will be reduced…2026
- Study the given chart showing evolution of plants. Answer the following questions: Identify the plant which acts as an immediate…2026
- How is Hardy-Weinberg expression (p^2+2 pq+q^2)=1 derived? List any two factors that disturb the genetic equilibrium.2026
- Explain the three different ways in which natural selection operates. Explain with the help of graphs.2026
- Define adaptive radiation. How did Darwin explain adaptive radiation?2026
- Compare homologous and analogous organs by giving any one point of difference. Mention the type of evolution each represents and…2026
- S.L. Miller conducted an experiment in 1953 to simulate the conditions of early earth in a laboratory setup. Answer the following…2026
- If a natural population with 200 individuals is in Hardy-Weinberg equilibrium for a gene with two alleles A and a, with the gene…2025
- If a natural population with 50 individuals is in Hardy-Weinberg equilibrium for a gene with two alleles A and a, with the gene…2025
- Which one of the following options shows the correct evolutionary order of the plants mentioned below? (i) Ferns (ii) Ginkgo…2025
- If a natural population of 60 individuals is in Hardy-Weinberg equilibrium for a gene with two alleles B and b, with the gene…2025
- Which of the following combinations is a correct example of convergent evolution in Australian marsupials and Placental mammals?2025
- The first human-like homonid evolved during human evolution is supposed to be:2025
- Which of the following combinations is a correct example of convergent evolution in Placental mammals and Australian marsupials?2025
- Which of the following combinations is a correct example of convergent evolution in Australian marsupials and Placental mammals?2025
- About 15 mya during human evolution, the primates which used to walk like gorillas and chimpanzees were:2025
- In a certain population, the frequency of three genotypes is as follows: Choose the option that shows the frequency of P and p…2025
- The primates that probably lived in East Africa grasslands about two mya were:2025
- Land reptiles which went back into water about 200 mya to evolve into fish-like reptiles were:2025
- The animals that evolved into the first amphibians during evolutionary history were:2025
- Evolution of modern man involves the following man-like primates. Choose the correct series of human evolution.2025
- In his observations of small black birds in the Galapagos Islands, Darwin found that all the finches arose from the original…2025
- A few stages and their respective time period in the evolutionary history of human beings are mentioned in the flowchart given…2025
- "The process of evolution of different species in a given geographical area starts from a point and literally radiates to other…2025
- How does the process of Natural Selection affect Hardy-Weinberg equilibrium? Explain with the help of graphs.2025
- Compare and contrast convergent and divergent evolution.2025
- Highly conserved proteins such as Haemoglobin and Cytochrome-C provide the best biochemical evidences to trace evolutionary…2025
- Read the following passage and answer the questions that follow. The most convincing evidence to trace evolutionary relationships…2025
- Read the following passage and answer the questions that follow. According to evolutionary theory, every evolutionary change…2025
- Homologous organs indicate:2024
- The origin of life according to the early Greek philosophers was transfer of unit of life from outer space to the different…2024
- During the 1850s in the pre-industrialisation era in England, the expected effect of natural selection on the number of…2024
- Louis Pasteur dismissed the theory of spontaneous generation by his experiments using pre-sterilised flasks and:2024
- Single step large mutation leading to speciation is also called2024
- Which one of the following statements is not true?2024
- After the 1850s in the post-industrialization era in England, the expected effect of natural selection on the number of…2024
- Hugo de Vries proposed the mutation theory of organic evolution after his experiments on2024
- The scientist who proposed that "embryos of all vertebrates including humans develop a row of vestigial gill slits behind the…2024
- A population is in genetic equilibrium/Hardy-Weinberg equilibrium for a gene with 2 alleles (dominant allele is 'A' and recessive…2024
- S.L. Miller in 1953, to support the theory of chemical evolution, created conditions in the closed flask that included:2024
- Who proposed the mutation theory in favour of organic evolution?2024
- Homologous organs indicate2024
- Assertion: Gene flow increases genetic variations. Reason (R): The random introduction of new alleles into a recipient population…2024
- Observe the picture given below. Name the naturalist and write the explanation given by him that evolution of life forms had…2024
- Explain the significance of the experiment carried out by S.L. Miller. Name the scientists whose hypothesis prompted him to carry…2024
- Whose skulls 'A', 'B', and 'C' are shown below? Which of the two are more similar to each other? Name the (i) ape like (ii) man…2024
- A population of snakes lived in a desert with brown sand. Study the drawings given below showing the change in the population…2024
- List the salient features of Darwin's theory of natural selection. Microbes have proved to be suitable examples to study…2024
- At which stage during evolution did human use hides to protect their bodies and buried their dead?2023
- Identify the option that gives the correct type of evolution exhibited by the two animals shown, living in the same habitat in…2023
- Which one of the following was not present during the Mesozoic Era of the geological time scale?2023
- Select the option that gives the correct description of the process of Natural Selection with respect to the length of the neck…2023
- Assertion: The number of white winged moths decreased drastically after industrialisation in England. Reason (R): Effects of…2023asked 2×
- Assertion: Homo sapiens have evolved from chimpanzee-like ancestors. Reason (R): There is no difference between the two in the…2023
- Assertion: The Mediterranean orchid Ophrys uses sexual deceit to get pollinated by a species of bee. Reason (R): The female bee…2023
- Assertion: Darwin showed how even a slow growing animal like an elephant could reach enormous numbers. Reason (R): When resources…2023
- Assertion (A): The Monarch butterfly is highly distasteful to the predators. Reason (R): The butterfly has a very rough skin…2023
- "Some species of insects and frogs have evolved with various specific features that help them from being detected." Justify the…2023
- Explain how did the experiment conducted by S.L. Miller substantiate that life evolved from pre-existing non-living organic…2023
- Industrial melanism in England after 1850 is an excellent example of Natural selection. Explain how?2023
- Darwin's theory of Natural Selection is widely accepted but some limitations have been identified by modern biologists. Mention…2023
- Mention Darwin's observations made on finches during his visit to Galapagos Islands. Write the explanation given by Darwin on his…2023
- Name the two primate ancestors of the present day humans, who existed approximately about 15 million years ago. According to…2023
- (i) Describe the phenomenon of adaptive radiation as explained by Darwin. (ii) Is human evolution an example of adaptive…2023
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