Guest
You need to login to ask any Questions from chapter Evolution of Biology-MCQS

Chapter:

Evolution

When environmental change occurs, multiple new niches become available. Organisms in this changing environment will undergo rapid change to fill se new niches.
This process is known as

Diversifying selection Allopatric speciation Adaptive radiation Directional selection

A. Diversifying selection is also known as disruptive selection. It occurs where an environmental change may produce selection pressure that favours two extreme characteristics. For example, grass plant on welsh copper mines. Contaminated soil containing copper is lethal to normal grass plants but a chance mutation allowed one plant to grow. This plant prospered and reproduced but only on the contaminated soil. On normal soil, it grew more slowly than normal plants and was easily out competed.

B. Changing climate may isolate population on mountain peaks or in remnant lakes, or rare migrants may colonise new areas such as the Galapagos and Hawaiian islands. This geographic isolation is termed as allopatry and gives rise to allopatric speciation.

C. Adaptive radiation is a special evolutionary pattern characterised by rapid increase in the numbers of kinds of closely related species. It results in an evolutionary explosion of new species from a common ancestor. For example, Darwin's finches.

D. Directional selection occurs whenever the environment changes in a particular way and therefore, is a selective pressure for species to change in response to the environmental change. For example industrial melanism. Industrial melanism is a phenomenon shown by light coloured peppered moth (Biston betularia typica) and dark coloured moth (Biston betularia carbonaria). It is a evolutionary process in which darker individuals predominate over lighter individuals since the industrial revolution is a result of natural selection.

E. Convergent evolution is a process during which organisms with different evolutionary history evolve similar phenotypic adaptations in response to common environmental conditions. Hence, analogous organs are formed which have different basic structure but perform similar functions. For example, insect wings and birds wings.

Hence, when the organisms undergo changes to fill the new niches formed by changes in environment, the process is termed as adaptive radiation.

So, the correct answer is 'Adaptive radiation'.

Hint Answer

Previous Question

Next Question

All Chapters

View all Chapter and number of question available From each chapter from Biology-MCQS

Guest You need to login to ask any Questions from chapter Evolution of Biology-MCQS

Chapter:

When environmental change occurs, multiple new niches become available. Organisms in this changing environment will undergo rapid change to fill se new niches. This process is known as

Adaptive radiation

All Chapters

The Living World

Biological Classification

Plant Kingdom

Animal Kingdom

Morphology of Flowering Plants

Anatomy of Flowering Plants

Structural Organisations in Animals

Cell : The Unit of Life

Biomolecules

Cell Cycle and Cell Division

Transport in Plants

Mineral Nutrition

Photosynthesis in Higher Plants

Respiration in Plants

Plant Growth and Development

Digestion and Absorption

Breathing and Exchange of Gases

Body Fluids and Circulation

Excretory Products and Elimination

Locomotion and Movement

Neural Control and Coordination

Chemical Control and Coordination

Reproduction in Organisms

Sexual Reproduction in Flowering Plants

Human Reproduction

Reproductive Health

Principles of Inheritance and Variation

Molecular Basis of Inheritance

Evolution

Human Health and Disease

Strategies for Enhancement in Food Production

Microbes in Human Welfare

Biotechnology Principles and Processes

Biotechnology and its Applications

Organisms and Populations

Ecosystem

Biodiversity and Conservation

Environmental Issues

Similar Question

&nbsp;For a particular trait, the frequency of the dominant allele is found to be<b> p = .3</b>.<br> &nbsp;What is the frequency of heterozygotes present in this population?</h2></div>

When environmental change occurs, multiple new niches become available. Organisms in this changing environment will undergo rapid change to fill se new niches. This process is known as

&nbsp;Which of the following conditions will result in the&nbsp;D&nbsp;allele frequencies of&nbsp;a population remaining unchanged?&nbsp;<span><br> </span></h2></div>

When environmental change occurs

multiple new niches become available. Organisms in this changing environment will undergo rapid change to fill these new niches.<br> This process is known as&nbsp;</h2></div>

Evolution

Biology-MCQS

Guest
You need to login to ask any Questions from chapter Evolution of Biology-MCQS

When environmental change occurs, multiple new niches become available. Organisms in this changing environment will undergo rapid change to fill se new niches.
This process is known as

For a particular trait, the frequency of the dominant allele is found to be<b> p = .3</b>.<br> What is the frequency of heterozygotes present in this population?</h2></div>

When environmental change occurs, multiple new niches become available. Organisms in this changing environment will undergo rapid change to fill se new niches.
This process is known as

Which of the following conditions will result in the D allele frequencies of a population remaining unchanged? <span><br> </span></h2></div>

multiple new niches become available. Organisms in this changing environment will undergo rapid change to fill these new niches.<br> This process is known as </h2></div>