Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology evolution of life darwinism or theories of natural selection darwin's theory of evolution theories of evolution

According to Darwin, diversity is found in Australian marsupials is due to:

  1. Convergent evolution.

  2. Divergent evolution.

  3. Adaptive radiation.

  4. Co - evolution.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Adaptive radiation is the process where organisms diversify rapidly from an ancestral species into a multitude of new forms, particularly when a change in the environment makes new resources available, as seen with Australian marsupials.

Multiple choice biology evolution of life darwinism or theories of natural selection darwin's theory of evolution theories of evolution

Which types of birds were absent on Galapagos islands when they were surveyed by Darwin?

  1. Warblers and wood peckers

  2. Carnivores

  3. Cactus feeding

  4. Seed eating
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

On his visit to the Galapagos Islands, Charles Darwin found a few types of finches that fluctuated from island to island, which helped him to build up his hypothesis of characteristic selection. Darwin's finches are a traditional case of a versatile radiation. Their regular precursor touched base on the Galapagos around two million years prior. Amid the time that has passed Darwin's finches have advanced into 15 perceived species contrasting in body measure, snout shape, melody and sustaining conduct.

So, the correct option is 'Warblers and woodpeckers'.

Multiple choice biology evolution of life darwinism or theories of natural selection darwin's theory of evolution theories of evolution

Plants and animals  of Galapogoe islands resemble plants and animals of main land in

  1. North Africa

  2. North America

  3. South Africa

  4. South America
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A Galápagos tortoise most nearly looks like South American tortoises. Disengaged on these remote islands, the Galápagos tortoise has developed unmistakable structures. 
A comparative likeness to territory feathered creatures can be found in an island finch Darwin never observed alone finch animal types living on Cocos Island, a modest, remote volcanic island found 630 kilometres toward the upper east of the Galápagos. This finch does not take after the finches of Europe, Australia, Africa, or North America. Rather, it looks like the finches of Costa Rica, 500 kilometres toward the east.
So, the correct option is 'South America'.
Multiple choice biology evolution of life darwinism or theories of natural selection darwin's theory of evolution theories of evolution

Which one cannot be explained by Darwinism?

  1. Over-specialisation

  2. Persistance of vestigal organs

  3. Occurrence of unchanged forms

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The key aspects of the theory of natural selection are rapid increase in population, struggle for existence resulting from limited food and space, Natural selection or survival of the fittest and elimination of the unfit and origin of new species. Darwinism fails to attribute the reasons for the existence of vestigial organs like vermiform appendix in human beings. These organs should have been eliminated during the progression of evolution because of its no use for long time. Another big limitation is the difference between heritable and non-heritable variations. Theory of natural selection fails to explain the origin of variation. Further, Darwin believed evolution is due to gradual variations. But in many instances, the occurrence of such variations are not of use for the struggle of existence. For example, the eye in the case of animals is functional only in a fully formed condition and all the features of the eye according to Darwin could not have come into existence at one step. It should have been by the collection of several mutations. But then each change by itself is of no advantage. Thus, the correct answer is 'All of the above.'

Multiple choice biology evolution of life darwinism or theories of natural selection darwin's theory of evolution theories of evolution

In postulating the theory of evolution by natural selection, Darwin was greatly influenced by 

  1. Mutation theory of Hugo de Vires

  2. Lamarck's theory of acquired characters

  3. Malthus idea of population control

  4. Environmental factors
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

One of his persuasions was Thomas Robert Malthus, a late-eighteenth-century financial analyst. Malthus stated is "Essay on the Principle of Population" (1798), which Darwin read and was roused.

So, the correct option is 'Malthus idea of population control'.

Multiple choice biology evolution of life darwinism or theories of natural selection darwin's theory of evolution theories of evolution

Choose the correct answers from the alternatives given.
Darwin believed that a giraffe has a long neck because

  1. God designed it that way

  2. catastrophes eliminated short-necked forms

  3. its ancestors stretched their necks to get food

  4. ancestral giraffes with slightly longer necks got more food than others and left more surviving offspring
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to Darwin theory, there is both long and short neck giraffe due variation in the population. when there is a shortage of short tree leaves, short neck giraffe died and long neck giraffe survive.

Hence, the correct answer is 'ancestral giraffes with slightly longer necks got more food than others and left more surviving offspring'

Multiple choice biology how do organisms reproduce? different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

Which one of the following is correct?

  1. Reproduction is linked to stability of population of a species.

  2. Reproduction is linked to instability of a population.

  3. Reproduction is linked to instability of a species.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During the process of reproduction, the DNA is passed from one generation to another. This replication takes place with little or no errors. There is consistency which leads to stability of reproduction. Also, reproduction helps in replacing aging population with new population and thus ensures the survival of the species. In the absence of reproduction, one particular species will disappear with time.
Thus, the correct answer is the option (A).

Multiple choice biology coordination - the linking system nervous systems involved in emotions types of nervous system components of nervous system

Due to stimulation of sympathetic nervous-system?

  1. Tear secretion increases

  2. Saliva secretion decreases

  3. Sweat secretion increases

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Sympathetic Nervous System manifests 'fight or flight' responses. It decreases the tear secretion and saliva secretion but increases sweat secretion. The parasympathetic nervous system increases tear secretion and saliva secretion.

Hence, the correct answer is 'sweat secretion increases'.