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.
Important Questions on Evolution
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
Find the true (T) and false (F) statements, and choose the correct option.
(i) Darwin said that variations, which are heritable and which make resource utilisation better for few, will enable only those to reproduce and leave more progeny.
(ii) Formation of new microbial species require very little time but for something to happen in a fish/fowl would take millions of years, since they have much longer life spans.
(iii) According to Lamarckism, long-necked giraffes evolved because they were nature selected only, long-necked animals.
(iv) Most modern breeds of dogs have evolved through artificial selection.
