Tag: biology

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Questions Related to biology

Multiple choice biology selection and evolution ethology animal behaviour natural selection

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Charles Darwin and Alfred Russel Wallace independently formulated the theory of natural selection, which was presented to the Linnean Society in 1858 and published in Darwin's 'On the Origin of Species' in 1859.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

Identify the true statement:

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

Natural selection is defined by differential reproductive success based on heritable traits, which leads to changes in allele frequencies over generations.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

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

  1. Galapagos islands

  2. Western Ghats

  3. Mediterranean sea

  4. Atlantic forest
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Galapagos Islands are famous for their unique biodiversity and the role they played in inspiring Darwin's theory of evolution by natural selection.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

Natural selection means _________________.

  1. Nature selects desirable characters

  2. Nature rejects undesirable characters

  3. Nature reacts with an organism

  4. a, b
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Natural selection is the process where individuals with traits better suited to their environment are more likely to survive and reproduce, effectively selecting for desirable characters.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

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

  1. humans

  2. birds

  3. lichens on tree bark

  4. smoke
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

Which of the following are difficult to explain in terms of 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.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Traits that appear to have no adaptive value, or seem counter-productive to survival, are often difficult to explain via simple natural selection, though theories like sexual selection or genetic hitchhiking are often invoked.