Plus Two Zoology Chapter Wise Previous Questions Chapter 5 Evolution are part of Plus Two Zoology Chapter Wise Previous Year Questions and Answers. Here we have given Plus Two Zoology Chapter Wise Previous Questions Chapter 5 Evolution.
Kerala Plus Two Zoology Chapter Wise Previous Questions and Answers Chapter 5 Evolution
Complete the boxes with the suitable words given below: [March-2018] (Analogus, Homologus, Convergent evolution, Divergent evolution)
a. A – Homologus
B – Divergent evolution
b. C – Analogus
Explain the factors affecting the Hardy- Weinberg- equilibrium. [March-2018]
a. Gene migration or gene flow.
d. Genetic recombination
e. Natural selection
Which of the following sets of gases were used in Miller’s experiment?
a. CH4, NO2, H2O,CO2
b. NH3, CH3, H2O,H2
c. H2, CH4,NH3,H2O
d. H2O, N,CH4,H2 [March-2017]
A population of 208 people of MN blood group was sampled and it was found that 119 were MM group, 76 MN group and 13 NN group. Answer the following questions:
a. Determine the gene frequencies of M and N alleles in the population.
b. How does the above frequencies affect evolution?
Examine the pictures of darwin’s finchesiven below and answer the following
a. What phenomenon in evolution is represented in the picture?
b. Explain the phenomenon with the help of an additional example. [March-2017]
a. Frequency of M = (119 × 2)+76
Frequency of M = 238+76 = 314
Frequency of N = (13 × 2)+76 = 26 +76 = 102
Gene frequency of M allele = M/(M+N)
M = 314/(314+102)= 314/416
Gene frequency of M allele = 0.75
Gene frequency of N allele = N/(M+N)
N= 102/(314+102) N= 0.245
Gene frequency of N allele = 0.25 M = 0.75 N = 0.25 M+N = 1 or (p+q = 1)
0.75+0.25 = 1 , So it agrees with the Hardy weinberg law of equilibrium.
b. The frequency of occurrence of alleles of gene ramain fixed and same through generations. A change in the frequency of alleles brings about evolution.The above frequencies agrees the Hardy weinberg law of equilibrium, so allele frequencies in a population constant and stable generation after generation. It doesn’t affect evolution.
a. Adaptive radiation.
b. The process of evolution of different species in a given geographical area starting from a point and literally radiating to other geographical areas or habitat.
- Darwin’s finches
- Australian marsupials
- Placental mammals in Australia
Which theory talks about the huge explosion that leads to origin of universe ? [March-2016]
Big Bang theory
Read the principle and answer the questions:
“Allele frequencies in a population are stable and constant from generation to generation called genetic equilibrum”.
a. Name the principle mentioned here.
b. Mention any two factors affecting the equilibrium.
c. What is the significance of disturbances occur in the genetic equilibrium ?
‘Natural selection can lead to stabilisation, directional change and disruptive changes’.
Explain the terms stabilization, directional change and disruptive change mentioned above.[March-2016]
a. Hardy – Weinberg principle.
b. Gene migration or gene flow, genetic drift and mutation.
c. Disturbance in genetic equilibrium change of frequency of alleles in a population would then be interpreted as resulting in evolution
No, Human evolution can not be called. adaptive radiation. This is because adaptive radiation is an evolutionary process that produces new species from a single rapidly diversifying lineage. Which is not the case with human
evolution. Human evolution is a gradual process that took place slowly. In time it represents an example of anagenesis .
The above shown pictures are beaks of a particular type of bird seen in an island during Darwin’s journey.
a. Identify the bird and name the is land.
b. Write the significance of this process in answer:
a. The bird is Darwin’s Finches. The name of Island is Galapagos island.
b. Darwin finches differed primarily in body size and beak shape as adaptation to types of food available on islands. All these species evolved in different directions from common ancestral form and adapted to new invaded habits and to modes of life necessary there. This phenomenon is called adaptive radiation.
Match the following:
|a. Natural selection||1. Convergent evolution|
|b. Inheritance of aquired characters||2. Genetic drift|
|c. Analogous structures||3. Charles Darwin|
|d. Gene flow by chance||4. Lamarckism|
“Galapagos Islands are the living laboratory of evolution”
a. Who made this statement?
b. Name the small dark birds in these islands.
c. What is adaptive radiation? [Model-2014]
a. Charles Darwin
b. Big Bang theory
c. kdaptive radiation: It is the process of evolution of different species in a given geographical area starting from a point and literally radiating to other areas of geography (habitats). eg., Darwin finches: Charles Darwin during his visit to Galapagos islands found that closely related small birds called Darwin finches differed primarily in body size and beak shape as adaptation to types of food available on islands. All these species evolved in different directions from
common ancestral form and adapted to new invaded habits and to modes of life necessary there. This phenomenon is called adaptive radiation.
Given below is the diagrammatic representation of the operation of natural selection on different traits.
a. Identify the type of natural selection A, B and C with explanation of each.
b. Define Hardy-Weinberg principle.
A- Stabilising selection – (Intermediate characters are selected)
B – Directional selection – (Any one of the extreme characters selected)
C – Disruptive selection (Both the extreme characters selected)
b. It states that under certain conditions of stability, allele frequencies of a population are stable and constant from generation to generation in sexually reproducing organism. This, equilibrium is called genetic equilibrium or Hardy-Weinberg equilibrium.
Arrange the following geological periods in correct order from ancient to recent Triassic, Permean, Tertiary, Cretaceous, Quaternary, Jurrassic, carboniferous. [Model-2014]
Carboniferous → Permean Triassic → Jurasic → Cretaceous → Tertiary → Quarternary
Theory of chemical evolution is a version of theory of abiogenesis. Analyze the statement. [March-2013]
The theory of chemical evolution says that small elements combined to form compounds which further form small molecules. In theory of Abiogenesis living organisms for med from non living substances that is small elements combined to form compounds which further for ms small living molecules i.e., non living substance combined to form large living molecules.
The population of grey coloured Biston betularia were almost replaced by the black variety in England.
a. Name the evolutionary process?
b. Explain the reason? [Model-2013]
a. Natural selection
b. Industrial melanism
Differentiate between convergent and divergent evolution? [Model-2013]
Conyergent evolution animals in different habitats shows same character. Divergent evolution from one type of animals, different varieties are formed.
An evolutionary process occurred in the evolution of marsupial mammals in Australia is given below.
a. Name this evolutionary process.
b. Suggest another example for this phenomenon. [March-2012]
a. Adaptive radiation
b. Darwins finches seen in Galapagos island around South America.
A collection of peppered moths made in England during different period is given below.
|Types of moths||1850||1920||1980|
|White winged moth||1200||305||1150|
|Dark winged moth||315||1100||302|
a. What is your observation?
b. Name the evolutionary process behind this phenomenon.
c. Write the reason for decreased number of white winged moth in 1920. [March-2012]
a. White winged moth’s number high at 1850, become low at 1920 and rised again at 1980 where as in 1850 dark winged moth number is low at 1850 high at 1920 again came down at 1980. i.e., when number of one species rises the other species number become low.
b. Natural selection-Industrial melanism
c. The predator bird that feeds white winged moth identified them than dark winged bird in dark background found by soot and dust from factories.
On a visit to Thiruvan anthapuram Zoo, my friend saw the chimpanzee and asked: “Are you saying that we descended from this monkey?” How will you respond to this remark? [Say-2011]
During evolution man evolved from Dryopithecus and Ramapithecus. They were like gorillas and chimpanzees. Ramapithecus was man like and Dryopithecus was ape like.
The diagrams shown below represents the operation of natural selection on different traits. Observe the diagrams and answer the following.
a. Why graph C shows a marked difference from graph A?
b. What is the evolutionary significance of Directional Selection?
c. Mention the factors effecting gene frequency.
d. What is meant by founder effect? [Say-2010]
a. The graph C shows disruptive selection and graph A shows stabilizing selection.
b. Any one of the extreme characters selected.
c. Gene migration, Genetic drift, Mutation, Genetic recombination and Natural selection.
d. The effect where original drifted population becomes founders is called founder effect.
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