Which of the following is not an example of evolution a A fa

Which of the following is not an example of evolution?

a. A farmer allows only short-haired sheep to reproduce, and subsequent generations of sheep have shorter and shorter hair.

b. A female crab mates with a large-clawed male instead of a small-clawed male, and 80% of her sons have large claws.

c. A parasite kills half of the crops in a field. At the end of the season the farmer collects the seeds. The next season the same parasite kills only 25% of the crops planted from these seeds.

d. A population of plants grown in nutrient-rich soil is 4.5 cm taller on average than an adjacent population grown in nutrient-poor soil.

Solution

d. A population of plants grown in nutrient-rich soil is 4.5 cm taller on average than an adjacent population grown in nutrient-poor soil.

Evolution is considered as a change that has come in the heritable characteristics of a particular population over its successive generation and in many instances it will provide them better scope to survive.

Based on the above definition, the option D will not come under evolution, because the plant when grown on nutrient rich soil, it is growing taller, but when you sow the seeds on nutrient poor soil, it may not grow taller. So no adaption is taking place here. Based on the situation it is acting.

But options a, b and c is showing a change in their heritable characteristics and only particular trait is getting transmitted to the future generations.