Tag: selection and evolution

Questions Related to selection and evolution

State whether the following statements are true or false .
Guttation takes place through specialised pores called lenticels.

biology selection and evolution ethology animal behaviour natural selection

  1. True

  2. False

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Correct Option: B
Explanation:

Guttation is a process of oozing out of the xylem sap on the margin of the leaves through specialized openings called hydathodes. Guttation is also known as bleeding of the leaf.

So, the given statement is false.

State whether the following statements are true or false .
Transpiration decreases as air temperature increases.

biology selection and evolution ethology animal behaviour natural selection

  1. True

  2. False

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Correct Option: B
Explanation:

As the temperature increases, it makes the surrounding air dry that causes the rate of transpiration to increase. The increase in temperature results in a higher vapour pressure gradient. With the decrease in temperature, transpiration also decreases.

So, the given statement is false.

State whether the following statements are true or false .
When grapes are placed in honey they shrink due to endosmosis.

biology selection and evolution ethology animal behaviour natural selection

  1. True

  2. False

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Correct Option: B
Explanation:

Both the grapes as well as honey are highly concentrated solutions. So, when grapes are placed in honey, no net movement takes place. Honey forms an isotonic solution with respect to grapes.

So, the given statement is false.

Choose the correct answers from the alternatives given.
Populations of peppered moths (Biston betularia) of England changed from 1% dark and 99% grey individuals to 99% dark and 1% light 
individuals between 1848 and 1898. The selective agent causing the change was

biology selection and evolution ethology animal behaviour natural selection

  1. humans

  2. birds

  3. lichens on tree bark

  4. smoke

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Correct Option: B
Explanation:

Due to Industrial melanism, refers to the evolution of dark body colours in animal species that live in habitats blackened by industrial soot. The phenomenon has been documented in numerous species that hide from predators by blending in with their backgrounds. The main predator is bird.

So the correct option is B, birds.

Which of the following are difficult to explain in terms of natural selection?

biology selection and evolution ethology animal behaviour natural selection

  1. Male peacocks evolve tail feathers that would appear to make them more rather than less vulnerable to predators.

  2. Male deer evolve antlers that are not used to defend themselves against predators.

  3. A bird issues a warning cry that puts it at greater risk of being noticed by a predator.

  4. Some traits appear to have no adaptive value.

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Correct Option: D

Initial causes of ecological succession, responsible for destruction of existed

biology selection and evolution ethology animal behaviour natural selection

  1. Animal species

  2. Ecosystem

  3. Populations

  4. Plant species

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Correct Option: C

Which of the following codon does not justify degeneracy rule?

biology selection and evolution ethology animal behaviour natural selection

  1. UGG

  2. CUG

  3. GGG

  4. GAG.

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Correct Option: A
Explanation:
Degeneracy is the rule in of genetic code which states that one amino acid can be produced by one or more codon. The example is UUU and UUG both code for same amino acid i.e phenylalanine.Tryptophan is only produced by UGG.
So the correct option is 'UGG'.

Choose the correct answers from the alternatives given.
Natural selection may occur when there are

biology selection and evolution ethology animal behaviour natural selection

  1. heritable traits

  2. differences in the adaptiveness of forms of traits to prevailing environmental conditions

  3. differences in survival and reproduction among individuals that differ in one or more traits

  4. all of the above

Show answer
Correct Option: D
Explanation:

Natural selection is the process where organism with favorable traits are more likely to reproduce. In doing so, they pass on these traits to the next generation. Over time this process allows organism to adapt to their environment.

Hence, the correct answer is 'all of the above'