Your cart is empty.
Practice each question, then open the answer or worked solution.
Fossils are generally found in:
Ans: (a) Sedimentary rocks
Explanation: Sedimentary rocks are formed over time and have less pressure and heat than metamorphic and igneous rocks enabling the preservation of fossils.
For the MN-blood group system, the frequencies of M and N alleles are 0.7 and 0.3, respectively. The expected frequency of MN-blood group bearing organisms is likely to be
Ans: (a) 42%
Explanation: Hardy Weinberg’s Principle states, the allele frequency in a population remains constant and it is shown through a binomial expansion of (p+q)2.
i.e. (p+q)2 = p2 +q2 +2pq =1
M=0.7 =p , N= 0.3 =q
(M+N)2 = (0.7)2 +(0.3)2 +2.0.7 x 0.3 +(0.3)2
= 0.49 +0.09 + 0.42
Frequency of MN = 2pq= 2 MN = 0.42 = 42 %
Therefore, the expected frequency of MN blood group is 42%.
Which type of selection explains industrial melanism observed in moth, Biston betularia:
Ans: (b) Directional
Explanation: In directional selection size of the population changes, the population changes towards one specific direction.
The most accepted line of descent in human evolution is:
Ans: (c) Ramapithecus - Homo habilis - Homo erectus - Homo sapiens
Explanation: Human evolution started from Ramapithecus about 14-15 million years ago. Then about 2 million years ago Homo habilis appeared. Then the Homo erectus and around 10,000 years ago modern man appeared.
Which of the following is an example for link species?
Ans: (a) Lobe fish
Explanation: Lobe fish belongs to bony fishes, and show characters from other two groups of animals, therefore they are considered link species.
Match the scientists listed under column ‘I’ with ideas listed in column ‘II’.
Column A | Column B | ||
A. | Darwin | i. | Abiogenesis |
B. | Oparin | ii. | Use and disuse of organs |
C. | Lamarck | iii. | Continental drift theory |
D. | Wagner | iv. | Evolution by natural selection |
Ans: (b) A-iv; B-i; C-ii; D-iii
Column A | Column B | ||
A. | Darwin | iv. | Evolution by natural selection |
B. | Oparin | i. | Abiogenesis |
C. | Lamarck | ii. | Use and disuse of organs |
D. | Wagner | iii. | Continental drift theory |
In 1953 S. L. Miller created primitive earth conditions in the laboratory and gave experimental evidence for the origin of the first form of life from preexisting non-living organic molecules. The primitive earth conditions created include:
containing CH4, NH3 et(c)
Ans: (d) high temperature, volcanic storms, reducing atmosphere
containing CH4, NH3 et(c)
Variations during mutations of meiotic recombination are:
Ans: (a) random and directionless
Explanation: Mutation is a sudden inheritable change in the DNA. It appears in all directions.