Class 12 Biology Important Chapter 7 Evolution Solutions English Medium As Per The New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters ASSEB Class 12 Biology Important Solutions in English and select need one. AHSEC Class 12 Biology Additional Notes Download PDF. HS 2nd Year Biology Additional Solutions.
Class 12 Biology Important Chapter 7 Evolution
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. ASSEB Class 12 Biology Additional Question Answer are part of All Subject Solutions. Here we have given HS 2nd Year Biology Important Solutions English Medium for All Chapters, You can practice these here.
Evolution
Chapter: 7
| IMPORTANT QUESTION AND ANSWER |
Answer the Following Question:
1. Who proposed the Big Bang theory?
Ans: It was not proposed by any one person in the chapter, but it’s accepted as the standard theory explaining the origin of the universe.
2. Which gases were present in the primitive atmosphere of Earth?
Ans: Methane (CH₄), Ammonia (NH₃), Water vapour (H₂O), and Carbon dioxide (CO₂).
3. Which hominid first buried their dead?
Ans: Neanderthal man.
4. What is genetic drift?
Ans: Random change in allele frequency in a population.
5. What is chemical evolution?
Ans: Chemical evolution is the theory that life originated from inorganic molecules that formed organic compounds like amino acids, proteins, and nucleotides in primitive earth conditions. This idea was proposed by Oparin and Haldane and supported by Miller’s experiment.
6. What is industrial melanism?
Ans: Industrial melanism is an evolutionary effect observed in moths in industrialized areas. After industrialization, dark-colored moths survived better on soot-covered trees, while light-colored moths were predated more often, supporting natural selection.
7. How does the Hardy-Weinberg principle help in understanding evolution?
Ans: The Hardy-Weinberg principle states that allele frequencies in a population remain constant in the absence of evolutionary influences. Any deviation indicates that evolution is occurring due to factors like mutation, gene flow, genetic drift, or natural selection.
8. What is the significance of fossils in the study of evolution?
Ans: Fossils provide direct evidence of past life forms, allowing scientists to trace evolutionary changes over time and establish the age and sequence of organisms.
9. Describe Miller’s experiment and its significance in the origin of life.
Ans: S.L. Miller simulated early Earth conditions in a lab by using a mixture of CH₄, NH₃, H₂, and water vapor and passed electric sparks. After a week, he found organic compounds like amino acids. It proved that organic molecules could form spontaneously under primitive Earth-like conditions.
10. Explain industrial melanism with the help of an example.
Ans: In England, white-winged moths were dominant before industrialization. After pollution darkened tree trunks, dark-winged moths had survival advantage against predators. This change in population is an example of natural selection.
11. What is the Hardy-Weinberg principle? Write its equation and meaning.
Ans: It states that allele frequencies in a population remain constant from generation to generation in the absence of evolutionary influences.
Equation: p² + 2pq + q² = 1
Where p and q are frequencies of alleles A and a.
12. Explain the term “biological evolution.”
Ans: Biological evolution refers to the changes in inherited traits of populations over generations. It involves mechanisms like natural selection, mutation, and genetic drift leading to the formation of new species.
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