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MCQOPTIONS
This section includes 5751 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 2951. |
How does an evolutionary biologist explain why a species of birds has evolved a larger beak size? |
| A. | Large beak size occurred as a result of mutation in each member of the population. |
| B. | The ancestors of this bird species encountered a tree with larger than average sized seeds. They needed to develop larger beaks in order to eat the larger seeds, and over time, they adapted to meet this need. |
| C. | Some members of the ancestral population had larger beaks than others. If larger beak size was advantageous, they would be more likely to survive and reproduce. As such, large beaked birds increased in frequency relative to small beaked birds. |
| D. | The ancestors of this bird species encountered a tree with larger than average sized seeds. They discovered that by stretching their beaks, the beaks would get longer, and this increase was passed on to their offspring. Over time, the bird beaks became larger. |
| Answer» D. The ancestors of this bird species encountered a tree with larger than average sized seeds. They discovered that by stretching their beaks, the beaks would get longer, and this increase was passed on to their offspring. Over time, the bird beaks became larger. | |
| 2952. |
How much temperature was used for the gases to react ? |
| A. | 10o C |
| B. | 130o C |
| C. | 1000o C |
| D. | 50oC |
| Answer» C. 1000o C | |
| 2953. |
What is ethnobotany ? |
| A. | Relationship between primitive plants and people |
| B. | Study to soil |
| C. | Cultivation of flower yielding plants |
| D. | Use of plants and their parts |
| Answer» B. Study to soil | |
| 2954. |
The primitive cell-like colloidal particles capable of growth and division were ______. |
| A. | prokaryote |
| B. | coacervates |
| C. | eobionts |
| D. | chemoautotrophs |
| Answer» D. chemoautotrophs | |
| 2955. |
What was the mixture of gases used in chamber marked A ? |
| A. | Methane (CH4), ammonia (NH3), hydrogen (H2), and water (H2O) |
| B. | Oxygen (O2), ammonia (NH3), hydrogen (H2), and water (H2O) |
| C. | Oxygen (O2), ozone (O3), hydrogen (H2), and water (H2O) |
| D. | all above |
| Answer» B. Oxygen (O2), ammonia (NH3), hydrogen (H2), and water (H2O) | |
| 2956. |
The first photoautotroph organisms were ______. |
| A. | bryophyte |
| B. | algae |
| C. | cyanobacteria |
| D. | bacteria |
| Answer» E. | |
| 2957. |
The first organism to be found on a bare rock is a (an) ______. |
| A. | mos |
| B. | alga |
| C. | lichen |
| D. | fern |
| Answer» D. fern | |
| 2958. |
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» C. division of pre-exiting planets | |
| 2959. |
The surface temperature of the sun is ______. |
| A. | 6000o C |
| B. | 9000o C |
| C. | 1000o C |
| D. | 10,000o C |
| Answer» B. 9000o C | |
| 2960. |
How was Mendel's work ultimately reconciled with Darwin's theory of natural selection during the evolutionary synthesis in the 1930s and 1940s? |
| A. | Scientists recognized that once one thinks about species as populations, rather than individuals, there is no incompatibility between them. |
| B. | Mendel's theory was replaced by the mutation theory. |
| C. | It was recognized much of the variation we observe in nature is due to recombination, rather than mutation. |
| D. | A and C. |
| Answer» E. | |
| 2961. |
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» C. Aristotle | |
| 2962. |
Who performed this famous experiment to prove origin of life ? |
| A. | Oparin and Haldane |
| B. | Spallanzani and Pasteur |
| C. | Urey and Miller |
| D. | Fox and Pasteur |
| Answer» D. Fox and Pasteur | |
| 2963. |
The era called ‘age of prokaryotic microbes’ is ______. |
| A. | archaezoic |
| B. | precambrian |
| C. | phaenerozoic |
| D. | proterizoic |
| Answer» B. precambrian | |
| 2964. |
Which of the following are difficult to explain in terms of natural selection? |
| A. | Male peacocks evolve tail feathers that would appear to make them more rather than less vulnerable to predators. |
| B. | Male deer evolve antlers that are not used to defend themselves against predators. |
| C. | A bird issues a warning cry that puts it at greater risk of being noticed by a predator. |
| D. | Some traits appear to have no adaptive value. |
| Answer» E. | |
| 2965. |
Which of the following are the most distantly related to one another? |
| A. | Sunfish and dolphins. |
| B. | Tree frogs and snakes. |
| C. | Vampire bats and birds. |
| D. | Bears and whales. |
| Answer» B. Tree frogs and snakes. | |
| 2966. |
The doctrine of evolution is concerned with ______. |
| A. | gradual change |
| B. | abiogenesis |
| C. | biogenesis |
| D. | none of the above |
| Answer» D. none of the above | |
| 2967. |
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» E. | |
| 2968. |
What's the difference between natural selection and sexual selection? |
| A. | Sexual selection occurs during sex. |
| B. | Natural selection is a type of sexual selection. |
| C. | Sexual selection is a type of natural selection. |
| D. | Sexual selection occurs within demes, natural selection does not. |
| Answer» D. Sexual selection occurs within demes, natural selection does not. | |
| 2969. |
Which of the following is not an example of a monophyletic taxon? |
| A. | The first fish species and every living organism that looks like a fish . |
| B. | The first mammal species and all its descendants. |
| C. | The first bird species and all its descendants. |
| D. | All of the above. |
| Answer» B. The first mammal species and all its descendants. | |
| 2970. |
Which of the following examples of variation is not important from an evolutionary standpoint? |
| A. | Genetic differences between individual organisms comprising the population. |
| B. | Inherited differences between individual organisms comprising the population. |
| C. | Differences due to diet, health, age or accident that have no affect on an individual's ability to survive and reproduce. |
| D. | A and B. |
| Answer» D. A and B. | |
| 2971. |
What is the relationship between the wing of a bird and the wing of a bat? |
| A. | They are homologous because they represent modified forms of a trait present in a common ancestor (forelimbs). |
| B. | They are analogous because while each carries out the same function (flight), this trait has arisen independently as a result of convergence (i.e. the common ancestor of both did not have a forelimb that allowed it to fly). |
| C. | A and B. |
| D. | They represent derived homologies. |
| Answer» D. They represent derived homologies. | |
| 2972. |
According to our reading, how did George Cuvier account for extinctions in nature? |
| A. | Extinctions never occur--there are unexplored parts of the globe where organisms that appear to have gone extinct may still live. |
| B. | Extinctions occur when the slow adaptation of organisms over time to their environment is not quick enough to help them respond to changing conditions. |
| C. | Extinctions occur at random, they do not reflect God's will. |
| D. | Extinctions are due to catastrophic events. |
| Answer» E. | |
| 2973. |
Speciation is the evolutionary process by which _____. |
| A. | a new gene pool is formed |
| B. | evolutionary paths of species converge |
| C. | hybrid species formed |
| D. | Shows up differences in physical traits |
| Answer» B. evolutionary paths of species converge | |
| 2974. |
Which of the following is not an example of a macro evolutionary process? |
| A. | One lion species splits to form two lion species over geological time. |
| B. | The same trait evolves independently in two different taxa (e.g. wings in birds and in insects). |
| C. | As a result of their activities, humans drive Dodos (a bird species) extinct. |
| D. | Over a short period of time, the frequency of a single gene declines from 10 to 8%. |
| Answer» E. | |
| 2975. |
Why is the advent of reproductive isolation important from an evolutionary standpoint? |
| A. | When the organisms comprising two populations of a species can no longer interbreed, the flow of genetic material between them stops. |
| B. | It is not important from an evolutionary standpoint. The question is based on a false assumption. |
| C. | Reproductive isolation increases the mutation rate. |
| D. | Reproductive isolation may slow reproduction. |
| Answer» B. It is not important from an evolutionary standpoint. The question is based on a false assumption. | |
| 2976. |
If the theory of natural selection is the survival of the fitness, and the fittest are identified as those who survive, why isn't it regarded as a tautology (a statement that is true only because of the meaning of the terms) ? |
| A. | The effect of traits on the fitness of an organism can be assessed independently of whether the organism indeed survives . |
| B. | It is regarded as a tautology - the question is based on a false assumption. |
| C. | There may be some statements in science that are useful even if they are not falsifiable or refutable in principle. |
| D. | A and C. |
| Answer» E. | |
| 2977. |
Which of the following is an example of an ancestral homology? |
| A. | Almost all modern reptiles, birds and mammals have forelimbs, a trait they also share with contemporary amphibians. |
| B. | The first birds and all their descendant species have feathers, a trait that is unknown in any other group. |
| C. | Humans and many insect species have eyes. |
| D. | All of the above. |
| Answer» B. The first birds and all their descendant species have feathers, a trait that is unknown in any other group. | |
| 2978. |
Which of the following is an example of environmental variation? |
| A. | Apu is a tongue roller, but his brother Sanjay is not. |
| B. | Marge dyes her hair blue. |
| C. | Homer inherited baldness from his father's side of the family. |
| D. | Patti and Selma have hanging ear lobes. |
| Answer» C. Homer inherited baldness from his father's side of the family. | |
| 2979. |
Which of the following is an example of genetic variation? |
| A. | Two children have different eye colors. |
| B. | One person is older than another. |
| C. | One person has a scar, but her friend does not. |
| D. | Tod eats meat, but his brother Rod is a vegetarian. |
| Answer» B. One person is older than another. | |
| 2980. |
Why, according to our reading, did Darwin take so long to publish the Origin of Species? |
| A. | Darwin wanted to share his theory as quickly as possible once he returned from his voyage on the Beagle. |
| B. | It took twenty years for Darwin to develop a theory. |
| C. | Darwin suffered from a number of illnesses. |
| D. | Darwin was concerned about the reaction of others to the implications of his theory. |
| Answer» E. | |
| 2981. |
The variation natural selection operates on is due to random mutations. What does this imply about natural selection? |
| A. | Natural selection is also a random process. |
| B. | Natural selection is nevertheless a directed process- the likelihood one variant will be favored in a given environment over another is predictable, even if the origin is not. |
| C. | There is no possibility God could be involved in this process. |
| D. | A, B and C. |
| Answer» C. There is no possibility God could be involved in this process. | |
| 2982. |
Which of the following are kingdoms? |
| A. | Monera . |
| B. | Protista. |
| C. | Animalae. |
| D. | All of the above. |
| Answer» E. | |
| 2983. |
Evidences of evolutionary relationships is found in ______. |
| A. | atmosphere |
| B. | fossils |
| C. | ocean beds |
| D. | rocks |
| Answer» C. ocean beds | |
| 2984. |
What's the difference between genetic drift and change due to natural selection? |
| A. | Genetic drift does not require the presence of variation. |
| B. | Genetic drift does not involve competition between members of a species. |
| C. | Genetic drift never occurs in nature, natural selection does. |
| D. | There is no difference. |
| Answer» C. Genetic drift never occurs in nature, natural selection does. | |
| 2985. |
Biogenetic law states that ______. |
| A. | ontogeny repeats phylogeny |
| B. | phylogeny repeats ontogeny |
| C. | no two living organisms are alike |
| D. | the favourable acquired characters are inherited |
| Answer» B. phylogeny repeats ontogeny | |
| 2986. |
Which of the following is the evidence for Darwin's theory of common descent? |
| A. | There are patterns in the fossil record that suggest other species have diverged from a single ancestor species. |
| B. | There are biogeographic patterns in the distribution of species, for instance distinct bird species on an island tend to resemble one another, suggesting a common ancestor. |
| C. | There are common stages in the early embryological development of organisms representing several distinct vertebrate groups. |
| D. | All of above |
| Answer» E. | |
| 2987. |
In which of the following ways is natural selection not analogous to artificial selection? |
| A. | With natural selection "picking" is due to the fit of an organism with its environment; whereas in artificial selection, the breeder "picks" which organisms will breed. |
| B. | Natural selection depends upon the presence of variation, artificial selection does not. |
| C. | Natural selection occurs within populations, artificial selection does not. |
| D. | There is a limit to how much change can be brought about by natural selection, no such limit exists for artificial selection. |
| Answer» B. Natural selection depends upon the presence of variation, artificial selection does not. | |
| 2988. |
Why is genetic variation important from an evolutionary standpoint? |
| A. | If all organisms were the same, the entire population would be vulnerable to particular pathogens, like viruses. |
| B. | All evolutionary adaptations (e.g. the origin of forelimbs) are the result of the gradual build up of genetic differences between organisms over geologic time. |
| C. | Evolution (at the population level) refers to changes in the frequencies of genes in the population over time. |
| D. | All of the above. |
| Answer» E. | |
| 2989. |
Which of the following is not a source of variation in a population? |
| A. | Inherited genetic differences. |
| B. | Differences due to health. |
| C. | Differences due to age. |
| D. | None of the above. |
| Answer» E. | |
| 2990. |
Which of the following is not an example of micro evolutionary change? |
| A. | The dark form of many moth species has increased in areas darkened by pollution. |
| B. | Penicillin resistant forms of bacteria have arisen since the introduction of antibiotics. |
| C. | The proportion of left and right bending moths in cichlid fish remains roughly 50:50. |
| D. | The last American eagle dies off, leading to the extinction of the species. |
| Answer» E. | |
| 2991. |
Links between organisms that show branching pattern of evolutionary relationships are shownby_____. |
| A. | living fossils |
| B. | comparative embryology |
| C. | phylogenetic trees |
| D. | two fossil layers |
| Answer» D. two fossil layers | |
| 2992. |
Serial homology is exhibited by ______. |
| A. | Organs of same individual occupying different levels of the body |
| B. | Organs of different organisms with same function |
| C. | appendages of various parts of prawn body |
| D. | both (A) and (C) |
| Answer» E. | |
| 2993. |
Mega – evolution is ______. |
| A. | Changes in the gene pool |
| B. | evolution due to mutations |
| C. | origin of a new biological group |
| D. | the evolution that takes centuries |
| Answer» D. the evolution that takes centuries | |
| 2994. |
What was the resultant found in place marked E ? |
| A. | Glucose, fatty acids and lipids |
| B. | Some fatty acids and organic acids |
| C. | Some amino acids as glycine and alanine and |
| D. | Organic esters only |
| Answer» D. Organic esters only | |
| 2995. |
Appearance of facial hair in some people is an example of |
| A. | mongolism |
| B. | analogous organs |
| C. | atavism |
| D. | all above |
| Answer» D. all above | |
| 2996. |
Von baer supports the theory of evolution on the basis of |
| A. | embryological character |
| B. | germs layers |
| C. | somatic variations |
| D. | genetic variations |
| Answer» B. germs layers | |
| 2997. |
Vermiform appendix in man, nictitating membrane and wisdom teeth are ______. |
| A. | homologous organ |
| B. | analogous organs |
| C. | vestigial organs |
| D. | none of the above |
| Answer» D. none of the above | |
| 2998. |
A. Arrhenius considered the panspermia mainly responsible for transfer for germs from other planets to Earth._ans_key_R. Present day study of meteorities as Allan Hills-84001 knocked out from Mars in Antarctica is rich aromatic hydrocarbons deposited by biological activity. |
| A. | If A and R both are true and R is correct explanation of A |
| B. | If A and R both are true but R is not correct explanation of A |
| C. | If A is true and R is wrong |
| D. | If A is wrong and R is true |
| Answer» B. If A and R both are true but R is not correct explanation of A | |
| 2999. |
Coacervates are |
| A. | colloidal droplet |
| B. | contain nucleoprotein |
| C. | (A) and (B) |
| D. | protobiont |
| Answer» D. protobiont | |
| 3000. |
Which of the following bird will be called most successfully evolved ? |
| A. | Lays 2 eggs, 2 hatch and 2 reproduce |
| B. | Lays 9 eggs, 9 hatch and 3 reproduce |
| C. | Lays 5 eggs, 5 hatch and 5 reproduce |
| D. | Lays 10 eggs, 5 hatch and 4 reproduce |
| Answer» D. Lays 10 eggs, 5 hatch and 4 reproduce | |