Tag: selection and evolution

Questions Related to selection and evolution

Zosterophyllum evolved from:

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

  1. Psilophyton.

  2. Rhynia type plants.

  3. Tracheophyta ancestors.

  4. Chlorophyte ancestors.

Show answer
Correct Option: C

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

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

  1. heterosis

  2. character displacement

  3. truncation selection

  4. frequency-dependent selection

Show answer
Correct Option: B
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.

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

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

  1. True

  2. False

Show answer
Correct Option: B
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.

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

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

  1. True

  2. False

Show answer
Correct Option: A
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'

The unit of natural selection is

biology selection and evolution ethology animal behaviour natural selection

  1. An individual

  2. A species

  3. A genus

  4. A population

Show answer
Correct Option: A

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

Show answer
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.

Show answer
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

Show answer
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

Show answer
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 $4$

Show answer
Correct Option: A