Evolution - Online Test
Q1. How is extinction represented in a tree diagram?
Answer : Option B
Explaination / Solution:
In a tree diagram, the extinction is represented as a branch ends that further do not divide any more. Extinction may be due to changed climatic condition or loss of ecological niche.
Q2. Which of the following is a living fossil?
Answer : Option D
Explaination / Solution:
Cycas, a gymnosperm is called the living fossil because they have been evolved in Jurassic period and still survive in present climatic condition.
Q3. Which of the following is an example of genetic variation?
Answer : Option B
Explaination / Solution:
Genetic variation is the difference in the offspring of same parents produce sexually. The children of same parents having different eye colour is an example of genetic variation. Age, scar and eating habits are not genetic variation.
Q4. The tendency of population to remain in genetic equilibrium may be disturbed by
Answer : Option C
Explaination / Solution:
The tendency of population to remain in genetic equilibrium may be disturbed by lack of random mating due to ethics and geographical or other barriers.
Q5. Genetic drift is found in
Answer : Option B
Explaination / Solution:
Genetic drift is found in small population with or without mutated genes. Loss of some member of species having small population leads to decrease in variation called genetic drift.
Q6. Which one of the followings is incorrect about genetic drift?
Answer : Option B
Explaination / Solution:
Genetic drift is significant only in small population. Larger population has more variation and more species. Loss of some member of that species does not reduce variation essential for evolution.
Q7. Single step large mutation is called
Answer : Option A
Explaination / Solution:
Evolution for Darwin was gradual while deVries believed mutation caused speciation. The single large mutation is called saltation.
Q8. Which of the following sentences is incorrect about microspheres?
Answer : Option D
Explaination / Solution:
Microspheres are molecules developed during organic evolution. They do not have all properties of life. They are composed of protein molecule and form buds to develop smaller microspheres.
Q9. In which condition gene ratio remains constant in a species?
Answer : Option A
Explaination / Solution:
Gene ratio remains constant in species having random mating. Gene flow, mutation and sexual selection are the factors that change the gene ratio of the population.
Q10. Two geographical regions, separated by high mountain ranges are
Answer : Option C
Explaination / Solution:
The geographical region Palarctic and Oriental are separated by high mountain ranges. The geographical separation do not allow the gene flow as mating is not possible between member of species.
