Tag: biology

Questions Related to biology

The idea of natural selection as the fundamental process of evolutionary changes was reached by:

biology selection and evolution ethology animal behaviour natural selection

  1. Charles Darwin and Alfred Russel Wallace in 1900

  2. Charles Darwin in 1866

  3. Alfred Russel Wallace in 1901

  4. Charles Darwin and Alfred Russel Wallace in 1859

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Correct Option: D

Identify the true statement:

biology selection and evolution ethology animal behaviour natural selection

  1. Mutations are adaptive and occur according to the changes in the environment.

  2. Genetic drift is the random fluctuations in the allele frequencies in large population.

  3. Natural selection is the difference in reproduction that causes difference in the contribution of alleles of next generation.

  4. Mutations are directional and occurs in the individuals of a population.

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Correct Option: C

Which is known as "The living laboratory of evolution"?

biology selection and evolution ethology animal behaviour natural selection

  1. Galapagos islands

  2. Western Ghats

  3. Mediterranean sea

  4. Atlantic forest

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Correct Option: A

Natural selection means _________________.

biology selection and evolution ethology animal behaviour natural selection

  1. Nature selects desirable characters

  2. Nature rejects undesirable characters

  3. Nature reacts with an organism

  4. a, b

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Correct Option: A

The modern synthetic theory of evolutions\assumes a positive role of which of the following in evolution?
a. Natural selection
b. Acquired characters
c. Artificial selection
d. Mutations.

biology selection and evolution ethology animal behaviour natural selection

  1. $1$ and $2$

  2. $1$ and $3$

  3. $2, 3$ and $4$

  4. $1$ and $4$

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Correct Option: A

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