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CBSE TEST PAPER-09 
CLASS - XII BIOLOGY (Evolution)
1. Name the two scientists who set up a special experiment to prove
Oparin’s theory of origin of life? 
[1] 
2. Name the common ancestor of apes & man? [1] 
3. Which period is known as “Age of amphibians”? [1] 
4. What is the study of fossils called? Mention any three points how the
fossils throw light on past life? 
[2] 
5. Why has natural selection not eliminated sickle – cell anaemia? [2] 
6. Life originated from the earth’s inorganic atmosphere in the post, but
this no longer happens today. Give two reasons? 
[2] 
7. What is Biogenetic law? How does comparative embryology provides
evidences for evolution? 
[3] 
8. Chemical insectides remain useful only for a limited time. Explain with
reference to evolution with a suitable example. 
[3] 
9. What does Hardy weinberg’s principle states? What are the factors
which affects Hardy weinberg’s equilibrium? 
[5] 
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FAQs on Evolution Test-2 - Class 12

1. What is evolution and why is it important?
Ans. Evolution is the process by which different species of organisms have developed and diversified over time. It is important because it helps us understand the origins and relationships of living organisms, as well as how they have adapted to their environments.
2. How does natural selection contribute to evolution?
Ans. Natural selection is a key mechanism in evolution. It occurs when individuals with certain advantageous traits are more likely to survive and reproduce, passing those traits on to their offspring. Over time, this leads to the accumulation of beneficial traits in a population, driving evolution.
3. Can evolution occur without natural selection?
Ans. Yes, evolution can occur without natural selection. Other mechanisms, such as genetic drift and gene flow, can also drive evolution. Genetic drift is the random change in gene frequencies within a population, while gene flow is the movement of genes between different populations.
4. How does the fossil record provide evidence for evolution?
Ans. The fossil record provides evidence for evolution by showing the existence of organisms that lived in the past and are now extinct. Fossils of transitional forms, which exhibit characteristics of both ancestral and descendant species, provide evidence for the gradual changes that occur over time and support the idea of common descent.
5. What is the role of mutations in evolution?
Ans. Mutations are the ultimate source of genetic variation, which is essential for evolution. Mutations are changes in the DNA sequence of an organism and can create new alleles. These new alleles can be acted upon by natural selection, leading to the evolution of new traits and potentially new species.
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