Download App

Evolution — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYEvolution3 Marks
Question
How does industrial melanism support Darwin’s theory of Natural Selection? Explain.
✓

Answer

Before industrial revolution-the environment was unpolluted the lichens on the barks of trees-pale, white winged moths could easily camouflage, while the dark winged were spotted out by the birds for food-hence they could not survive, After industrial revolution the lichens became dark (due to soot deposit), This favoured the dark winged months while the white winged were picked by birds, The population of the former increased (naturally selected).

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Evolution→Evolution — all question types→BIOLOGY STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

According to Darwinian theory, the rate of appearance of new forms is linked to their life cycles. Explain.
→
There are many animals that have become extinct in the wild but continue to be maintained in Zoological parks.
  1. What type of biodiversity conservation is observed in this case?
  2. Explain any other two ways which help in this type of conservation.
→
What is Trophic level? Draw diagrammatic representation of trophic levels in ecosystem.
→
Write any four differences between Vasa efferentia and Vasa deferentia.
→
During a monohybrid cross involving a tall pea plant with a dwarf pea plant, the offspring populations were tall and dwarf in equal ratio. Work out a cross to show how it is possible.
→
Somatic chromosome number is 40. What shall be the chromosome number in the cells of seminiferous tubules?
→
Draw a diagram of a typical agarose gel electrophoresis, showing migration of undigested and digested sets of DNA fragments. Label:
  1. The digested and undigested DNA fragments.
  2. Anode and cathode ends of the plate Mention the role of electrophoresis in biotechnology.
→
A non biology person is quite shocked to know that apple is a false fruit, mango is a true fruit and banana is a seedless fruit. As a biology student how would you satisfy this person.
→
GM Plants are useful in many ways. How would you convince the farmers to grow GM plants in their fields? Explain giving three reasons.

OR

People are quite apprehensive to use GM crops. Give three arguments in support of GM crops so as to convince the people in favour of such crops.

→
How arein-situ and ex-situ approaches of biodiversity conservations different from each other?
→