41. How might an evolutionary biologist explain why a species of species of salamander becomes blind after colonizing a cave?
A. It is possible that in the cave there is a source of pollution that increases the mutation rate for a gene that makes salamanders blind. Over time, due to exposure to this chemical, the members of the population lose their sight.
B. Members of the ancestral population that colonized the cave differed in their ability to see. If maintaining the ability to see in the cave was a waste of energy, blind salamanders might actually have more offspring than those who could see.
C. There is no way to explain this in terms of natural selection
D. The members of this salamander species no longer needed to use their eyes. Over time, due to lack of use, they lost the ability to see.
Answer : Option B
42. Which of the following is the most fit in an evolutionary sense?
A. A lion who is successful at capturing prey but has no cubs.
B. A lion who has many cubs, eight of which live to adulthood.
C. A lion who overcomes a disease and lives to have three cubs.
D. A lion who cares for his cubs, two of who live to adulthood.
Answer : Option B
43. How is extinction represented in a tree diagram?
A. A branch splits.
B. A branch ends.
C. A branch shifts along the X axis.
D. None
Answer : Option B
44. A biologist is trying to infer how five closely related species of snakes are related to one another. She notices that some of the snakes have forked tongues and others do not. Which of the following would help her distinguish the ancestral state?
A. She looks among snake fossils for evidence that being forked is a characteristic of the ancestor of this group, but determines no such fossils exist.
B. She locates a specimen of a more distantly related snake to see if it has a forked tongue.
C. She looks at a representative mammal species to see if it has a forked tongue.
D. She flips a coin.
Answer : Option B
45. The surface temperature of the sun is ______.
46. The earth like other planets formed from ______.
A. aggregates of uranium
B. cloud of gas and dust
C. division of pre-exiting planets
D. collisions of meteorites
Answer : Option B
47. The experiment to show the production of mice in 21 days from a dirty shirt placed in contact with kernels of wheat was carried out by ______.
A. Francesco Redi
B. Jean Baptiste Van Helmont
C. Aristotle
D. Louis Pasteur
Answer : Option B
48. The first formed organism (riboorganism) used only ................. for catalyzing reactions.
49. Anaerobic photosynthetic bacteria appeared on the earth about ______.
A. 500 million years ago
B. 1500 million years ago
C. 2500 million years ago
D. 3500 million years ago
Answer : Option D
50. The sequence of origin of life may be considered as ______.
A. Amino acid\(\rightarrow \) Protein \(\rightarrow \) Chlorophyll
B. Chlorophyll \(\rightarrow \) Starch \(\rightarrow \) Glycogen
C. Nucleic acid\(\rightarrow \) Amino acid \(\rightarrow \)Chlorophyll
D. Chlorophyll\(\rightarrow \) Nucleic acid \(\rightarrow \)Amino acid
Answer : Option C