Tag: selection and evolution

Quizzes (4) Questions (99)

Questions Related to selection and evolution

Multiple choice biology selection and evolution theory of natural selection natural selection evidence for evolution

Choose the correct answers from the alternatives given.
............ sometimes occurs in situations where individuals of two previously isolated demes come back into sympatry.

  1. heterosis

  2. character displacement

  3. truncation selection

  4. frequency-dependent selection
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Character displacement is the term used to describe an evolutionary change that occurs when two similar species inhabit the same environment. This due to the geographical isolation.

So correct option is B, character displacement.

Multiple choice biology selection and evolution theory of natural selection natural selection evidence for evolution

State whether the following statements are true or false .
Transpiration takes place only through stomata in terrestrial plants.

  1. True

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

Transpiration can vary according to the type of structure involved. It is of four types:

1. Stomatal transpiration: Occurs through stomata. It is responsible for 50-97% of total transpiration.
2. Cuticular transpiration: Occurs through cuticle (a waxy layer that covers the epidermis of leaves and stems). Contributes 3-10% of the total transpiration.
3. Lenticular transpiration: Occurs through lenticels (aerating pores in the cork of woody stems). insignificant contribution to water loss.
4. Bark transpiration: Occurs through the bark of woody stem. Contributes to 1% of total transpiration.
So, the given statement is false.

Multiple choice biology selection and evolution theory of natural selection natural selection evidence for evolution

State whether the following statements are true or false.
DPD always has a positive value whereas water potential a negative value.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Diffusion pressure deficit (DPD) : It is the decrease in diffusion pressure of water in a solution over its pure state. It is always positive as the decrement of pressure cannot be negative.
The diffusion pressure of pure water is maximum and it continues to decrease as more and more solute is added into it.
Water potential is the potential energy of water compared to the potential energy of pure water. The potential energy of pure water is highest and it is assumed aa zero due to the absence of any impurity. Therefore, the potential energy of other water will be less than zero hence, expressed in negative in relation to pure water.
So the correct answer is 'True'
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

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.

  1. $1$ and $2$
  2. $1$ and $3$
  3. $2, 3$ and $4$
  4. $1$ and $4$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The modern synthetic theory of evolution incorporates natural selection as the primary directional force and mutations as the source of genetic variation. Acquired characters and artificial selection are not considered core natural driving mechanisms in this evolutionary model.