Match the following columns. Column I Column II A Genetic drift 1 Change in the population’s allele frequency due to chance alone B Natural selection 2 Difference in survival individuals C Gene flow 3 Immigration or emigration changes the allele frequency D Mutation 4 Source of the new alleles
Important Questions on Evolution
Read the following statements:
(i) When reptiles came down mammals took over this earth.
(ii) Around 65 million years ago, some land reptiles went back to water and evolved into fish-like reptiles, called Ichthyosaurs.
(iii) Dinosaurs became extinct 200 million years ago.
(iv) The first mammals were like shrews.
Which of the above statements are incorrect?
Match the following columns.
| Column I | Column II | ||
| A | Analogous organs | 1 | Ontogeny repear phylogeny |
| B | Miller and Urey | 2 | Experiment (Chemical evolution) |
| C | Oparin and Haldane | 3 | Chemical evolution (theory) |
| D | Human embryo has gills | 4 | Wings of birds and butterfly |
Consider the following statements and select the correct option stating which one is true (T) and which one is false (F).
(i) Tyrannosaurus was the biggest dinosaur about feet in height and had huge fearsome dagger–like teeth.
(ii) Some land reptiles went back into water to evolve into fish–like reptiles probably million years ago.
(iii) According to the theory of spontaneous generation, “panspermia” was transferred to different planets from outer space, including earth.
(iv) According to Darwin, there has been gradual evolution of life forms.
(v) Homology is based on convergent evolution, while analogy refers to a situation exactly opposite.
Reason (R): The first autotrophic organisms were the chemoautotrophs that never released oxygen.
I. it mostly occurs in smaller populations.
II. certain alleles can be lost forever because of genetic drift.
III. founder effects and bottle neck effects are caused by genetic drift.
IV. mutations are primarly responsible for genetic drift.
The correct combination showing true statements is
Reason (R): The primitive earth conditions led to production of organic molecules.
I. They fail to interbreed.
II. They failed to give fertile offspring.
III. They have different coloured body.
IV. They appear morphologically slightly different.
Choose the correct combination from given options
