Tag: variation

Questions Related to variation

Which of the following is a result of natural selection?

zoology variation examples of natural selection selection natural selection

  1. Seedless grapes

  2. Insecticide - resistant mosquitoes

  3. Disease - resistant crop plants

  4. Cattle for high milk yield

Show answer
Correct Option: B
Explanation:

When the insecticides are used on a large scale, the genes in the organism are mutated and then there is no effect of the insecticide on the organism. This is the phenomenon of resistance evolved due to natural selection which allows the development of the mosquitoes which are resistant.

Thus, the correct answer is option B. 

Warrior ants have a chemical signal that tells other ants in the family not to attack. Some have adapted and learned to imitate the chemical signal from other colonies so they can invade and take over another colony and the workers will never know. The given example can be related to 

zoology variation examples of natural selection selection natural selection

  1. Genetic variation

  2. Mutation

  3. Natural selection

  4. None of the above

Show answer
Correct Option: C
Explanation:

The given example is of natural selection. According to the theory of natural selection, nature supports the survival of the fittest. It means, only those individuals will survive, who adapt themselves to the change in the environment. In the given case, those ants survived, who adapted the mechanism of chemical signalling and were selected by the nature as fittest. Whereas, those organisms died who didn't adapt the mechanism. So, the correct option is B.

Maximum ............ increase the chance of survival.

zoology variation examples of natural selection selection natural selection

  1. Variation

  2. Adaptation

  3. Mutation

  4. None of the above

Show answer
Correct Option: B
Explanation:

Adaptation:- process by which an animal or plant species becomes fitted to its environment; it is the result of natural selection's acting upon heritable variation.

So, the correct answer is "Adaptation".

Which of the following is considered during natural selection?

zoology variation examples of natural selection selection natural selection

  1. Genetic variation

  2. Differential reproduction

  3. Competition

  4. All of the above

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Correct Option: D
Explanation:

Natural selection:- The basic mechanisms of evolution, along with mutation, migration, and genetic drift. Darwin's grand idea of evolution by natural selection is relatively simple but often misunderstood. To find out how it works, imagine a population of beetles: There is variation in traits.

So, the correct answer is "All of the above".

In a habitat, there are red bugs and green bugs. The birds prefer the taste of the red bugs, so soon there are many green bugs and few red bugs. The green bugs reproduce and make more green bugs and eventually there are no more red bugs. The given example can be related to 

zoology variation examples of natural selection selection natural selection

  1. Adaptive radiation

  2. Natural selection

  3. Genetic variation

  4. All of the above

Show answer
Correct Option: B
Explanation:

The given example is of natural selection. According to the theory of natural selection, nature supports the survival of the fittest. It means, only those individuals will survive, who adapt themselves to the change in the environment. In the given case, bugs adapted the green colouration to survive. They were selected by the nature as fittest. So, the correct option is B.

The species which were not able to adapt to their environments through genetic changes to their skeletons were not able to survive. The given statement is an example of 

zoology variation examples of natural selection selection natural selection

  1. Skeletal Adaptations

  2. Coloration

  3. Physiological adaptations

  4. All of the above

Show answer
Correct Option: A
Explanation:

The given adaptation in lizard is an example of skeletal adaptation of natural selection. According to this adaptation, the individual who didn't develop the skeletal changes died. This type of adaptation can be seen in some species (lizards, giraffes) of animals who adapted themselves to the environment through genetic changes in their skeletons. For example, development of long neck in giraffes to reach food sources of the upper part of the trees. It is said that those died who didn't develop the long neck. Another example is development of longer leg bones in lizards to help them to climb up during periods of flood and to escape predators in the ground. Those lizards who didn't develop long leg bones, died. So, the correct option is A.

Which of the following has a natural selection as principle mechanism?

zoology variation examples of natural selection selection natural selection

  1. Adaptive radiation

  2. Convergent evolution

  3. Genetic variation

  4. None of the above

Show answer
Correct Option: A
Explanation:

Principle Mechanism:-

  • Variation. Organisms (within populations) exhibit individual variation in appearance and behavior.
  • Inheritance. Some traits are consistently passed on from parent to offspring.
  • High rate of population growth.
  • Differential survival and reproduction. 
  • Adaptive radiation:- A process in which organisms diversify rapidly from an ancestral species into a multitude of new forms, particularly when a change in the environment makes new resources available, creates new challenges, or opens new environmental niches.  So,the correct answer is "Adaptive radiation".

The animals having several adaptation and are able to adapt is given by theory of 

zoology variation examples of natural selection selection natural selection

  1. Evolution

  2. Natural selection

  3. Variation

  4. None of the above

Show answer
Correct Option: B
Explanation:

The Central idea of Darwinism is Natural Selection. He stated that nature selects the best-suited organisms that have a greater chance to become parents for the next generation who have adapted themselves. Thus, the correct answer is option B.

The peppered moths rested became blackened by soot, giving the dark-coloured moths

zoology variation examples of natural selection selection natural selection

  1. Advantage in hiding from predators

  2. Advantage in hiding from primary consumers

  3. Advantage in hiding from secondary consumers

  4. None of the above

Show answer
Correct Option: A
Explanation:

Due to changes in the environment, the dark coloured moths had a better survival chance as compared to the light coloured moths, which could be easily spotted. Hence, dark coloured moths got an advantage in hiding from predators. Hence dark coloured moths were able to leave the greater number of progeny. In other words, dark coloured moths were naturally selected and they were reproductively successful as compared to light coloured moths.

Thus, the correct answer is option A.

Peacock females pick their mate according to the males tail. The ones with the largest and brightest tails mate more often. The given example can be related to

zoology variation examples of natural selection selection natural selection

  1. Adaptive radiation

  2. Natural selection

  3. Convergent evolution

  4. None of the above

Show answer
Correct Option: B
Explanation:

The male peacock has a lot of showy feathers.However, peacocks use their feathers to attract peahens (female peacocks). The peacocks with the showier feathers are able to attract mates, so they are the ones that have offspring, and pass on the fancy-feather genes to the next generation.

So, the correct answer is  "Natural selection".