NEET Exam  >  NEET Tests  >  Biology Class 12  >  Test: Mechanism of Evolution (NCERT) - NEET MCQ

Test: Mechanism of Evolution (NCERT) - NEET MCQ


Test Description

15 Questions MCQ Test Biology Class 12 - Test: Mechanism of Evolution (NCERT)

Test: Mechanism of Evolution (NCERT) for NEET 2024 is part of Biology Class 12 preparation. The Test: Mechanism of Evolution (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Mechanism of Evolution (NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Mechanism of Evolution (NCERT) below.
Solutions of Test: Mechanism of Evolution (NCERT) questions in English are available as part of our Biology Class 12 for NEET & Test: Mechanism of Evolution (NCERT) solutions in Hindi for Biology Class 12 course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt Test: Mechanism of Evolution (NCERT) | 15 questions in 15 minutes | Mock test for NEET preparation | Free important questions MCQ to study Biology Class 12 for NEET Exam | Download free PDF with solutions
Test: Mechanism of Evolution (NCERT) - Question 1

Following is the diagrammatic representation of the operation of natural selection on different traits. Which among the following options correctly identifies all the three graphs A, B and C.

Detailed Solution for Test: Mechanism of Evolution (NCERT) - Question 1

Stabilising selection favours average sized individuals whereas eliminates small sized individuals. It reduces variation and thus does not promote evolutionary change. But, it maintains the mean value form generation of generation. In directional selection, the population changes towards one particular direction. It favours small or large sized individuals and more the mean size of the population changes. Disruptive in eliminates most of members with mean expression, so may lead to developemnt of two different individuals. it is important in bringing about evolutionary change.

Test: Mechanism of Evolution (NCERT) - Question 2

Select the pair which does not match. 

Detailed Solution for Test: Mechanism of Evolution (NCERT) - Question 2

According to Oparin's hypothesis, early protocell could have been a coacervate. Such a structure could have consisted of a collection of organic macromolecules surrounded by a film of water molecules. This arrangement of water molecules, although not a membrane, could have functioned as a physical barrier between the organic molecules and their surroundings.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Mechanism of Evolution (NCERT) - Question 3

Replacement of the lighter-coloured variety of peppered moth (Biston betularia) to its darker variety (Biston carbonaria) in England is the example of

Detailed Solution for Test: Mechanism of Evolution (NCERT) - Question 3

In England, before industrialisation in 1860, it was observed that there were more white-winged moths on tree trunks than dark-winged or melanised moths. But after industrialisation in 1920, there were more dark-winged moths in the same area. Before industrialisation, the tree trunks were covered by white-coloured lichens. In that background, the white-winged moths survived but the dark-winged moths were eaten by predators. During post industrialisation period, the tree trunks became dark due to industrial smoke and soot. Therefore, the white winged moths could not survive due to predators but dark-winged moths survived, i.e., the moths that were hidden in background survived. Thus, industrial melanism supports evolution by natural selection.

Test: Mechanism of Evolution (NCERT) - Question 4

The Hardy-Weinberg principle cannot operate if

Detailed Solution for Test: Mechanism of Evolution (NCERT) - Question 4

Hardy Weinberg punciple describes a theoretical situation in which a population is undergoing no evolutionary change. It states that allele frequencies in a population are stable and constant from generation to generation. Them are five factors that affect Hardy-Weinberg Pricniple. These are - mutation, gene flow, genetic drift, genetic recombination and natural selection pressure. 

Test: Mechanism of Evolution (NCERT) - Question 5

Read the following statements and choose the correct option.
(i) Increase in melanised moths after industrialisation in Great Britain is a proof for Natural Selection
(ii) When more individuals of a population acquire a mean character value, it is called disruption
(iii) Changes in allelic frequency in a population will lead to Hardy-Weinberg equilibrium
(iv) Genetic drift changes the existing gene or allelic frequency in future generations

Detailed Solution for Test: Mechanism of Evolution (NCERT) - Question 5

When more individuals of a population acquire a mean character value, it is called stabilising selection. No change in allelic frequency in a population will lead to Hardy-Weinberg equilibrium.

Test: Mechanism of Evolution (NCERT) - Question 6

An isolated population of humans with approximately equal numbers of blue-eyed and brown-eyed individuals was decimated by an earthquake. Only a few brown-eyed people remained to form the next generation. This kind of change in the gene pool is called a

Detailed Solution for Test: Mechanism of Evolution (NCERT) - Question 6

When the population is at decline, the number of individuals may reduce to a extent that the small group of population constituting the population becomes isolated and restricted on distribution. These are then exposed to random genetic drift resulting in the fixation of certain genes. Thus, the population re-estacblishes its former nichness. Such reduction in allele frequencies is called a genetic bottle-neck effect which often prevents the species from extinction.

Test: Mechanism of Evolution (NCERT) - Question 7

Fill up the blanks in the following paragraph by selecting the correct option
When migration of a section of population to another place and population occurs, (i) change in the original as well as in the new population. New genes/alleles are added to the (ii) population and these are lost from the (iii) population. There would be a (iv) if this gene migration, happens multiple times. If the same change occurs by chance, it is called (v). Sometimes the change in allele frequency is so different in the new sample of population that they become a different species. The original drifted population becomes founders and the effect is called (vi).

Test: Mechanism of Evolution (NCERT) - Question 8

Genetic drift operates in :-

Detailed Solution for Test: Mechanism of Evolution (NCERT) - Question 8

The random changes in gene frequencies in a population occurring by chance alone rather than by natural selection are called genetic drift or Sewall wright effect. The effects of genetic drift are most marked in very small isolated population, although it occurs in all populations.

Test: Mechanism of Evolution (NCERT) - Question 9

Which of the following is most important for speciation?

Detailed Solution for Test: Mechanism of Evolution (NCERT) - Question 9

Reproductive isolation is the prevention of interbreeding between the populations of a species present in the different environments. It maintains the characters of the species but also leads to origin of new species (speciation).

Test: Mechanism of Evolution (NCERT) - Question 10

At a particular locus, frequency of allele A is 0.6 and that of allele a is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium?

Detailed Solution for Test: Mechanism of Evolution (NCERT) - Question 10

In a stable population, for a gene with two alleles, 'A' (dominant) and 'a' (recessive), if the frequency of 'A' is p and the frequency of 'a' is q, then the frequencies of the three possible genotypes (AA, Aa and aa) can be expressed by the Hardy-Weinberg equation:
p+ 2pq + q2 = 1
where p2 = Frequency of AA (homozygous dominant) individuals
q2 = Frequency of aa (homozygous recessive) individuals
2pq = Frequency of Aa (heterozygous) individuals
so, p = 0.6 and q = 0.4 (given)
∴ 2pq (frequency of heterozygote)
= 2 × 0.6 × 0.4
= 0.48

Test: Mechanism of Evolution (NCERT) - Question 11

Industrial melanism as oberved in peppered moth proves that 

Detailed Solution for Test: Mechanism of Evolution (NCERT) - Question 11

The development of melanin pigment in moth occurred due to mutation. The light coloured form of peppered moth gave rise to the dark coloured form by mutation.

Test: Mechanism of Evolution (NCERT) - Question 12

Match column I with column II and select the correct option from the given codes.

Test: Mechanism of Evolution (NCERT) - Question 13

An inter-breeding population of finches became separated geographically, forming two isolated groups. Each group then became subject to different selective pressures. One group was then introduced into the habitat of the other. Which one of the following would determine whether they now formed two distinct species?

Detailed Solution for Test: Mechanism of Evolution (NCERT) - Question 13

Once inter-breeding population of finches, now have failed to produce fertile F1 hybrids, this means they have now formed two distinct species.

Test: Mechanism of Evolution (NCERT) - Question 14

The factors involved in the formation of new species are

Detailed Solution for Test: Mechanism of Evolution (NCERT) - Question 14

Isolation is the prevention of mating amongst inter breeding groups due to physical (e.g., geographical, ecological) and biotic (e.g., physiological, behavioural, mechanical, genetic) barriers. Reproductive isolating mechanisms are the biological properties of individuals which prevent the interbreeding of naturally sympatric populations. It maintains the characters of the species but can lead to the origin of new species. Also, Darwin considered that useful variations are transmitted to the offspring and appear more prominently in succeeding generations. After some generations these become continuous and gradual variations in the possessor would be so distinct that they form a new species.

Test: Mechanism of Evolution (NCERT) - Question 15

The different forms of interbreeding species that live in different geographical regions are called

Detailed Solution for Test: Mechanism of Evolution (NCERT) - Question 15

In allopatric speciation, a part of the population becomes eographically isolated from the main population. The population becomes entirely separated and finally consititutes a new species. Formation of Darwin's finches that formed separate species in Galapagos islands in an example of allopatric speciation.

122 videos|311 docs|196 tests
Information about Test: Mechanism of Evolution (NCERT) Page
In this test you can find the Exam questions for Test: Mechanism of Evolution (NCERT) solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Mechanism of Evolution (NCERT), EduRev gives you an ample number of Online tests for practice

Up next

122 videos|311 docs|196 tests
Download as PDF

Up next