Question
Write about the various theories of evolution.

Answer

Main theories of evolution are:
  1. Lamarckism or Theory of Inheritance of Acquired characters.
  2. Darwinism or Theory of Natural Selection.
  3. Mutation theory of De Vries.
  4. Neo-Darwinism or Modern concept or Synthetic theory of evolution.

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

Similar questions

  1. What is “population” according to you as a biology student?
  2. “The size of a population for any species is not a static parameter.” Justify the statement with specific reference to fluctuations in the population density of a region in a given period of time.
Give a schematic labelled diagram to represent oögenesis (without descriptions)
Give reasons why:
Groundnut seeds are exalbuminous and castor seeds are albuminous.
Ramesh visited a National Park on a school trip where he saw tiger eating a deer. He got disturbed and asked his teacher why is he doing so. His teacher replied that it is natural population controlling phenomenon.
  1. Which type of interspecific interaction is found between tiger and deer?
  2. State the role of predators.
  3. What other type of population interactions are seen in nature?
  4. State the values of Ramesh towards animals.
How did Meselson and Stahl experimentally prove that DNA replication is semiconservative? Explain.
What is a biogeochemical cycle. What is the role of the reservoir in a biogeochemical cycle. Give an example of a sedimentary cycle with reservoir located in earth’s crust.
Trace the path of spermatozoa from the testes upto the ejaculatory duct only.

OR

Schematically represent and explain the events of spermatogenesis in humans.

A cross was carried out between a pea plant heterozygous for round and yellow seeds with a pea plant having wrinkled and green seeds.
  1. Show the cross in a Punnett square.
  2. Write the phenotype of the progeny of this cross.
  3. What is this cross known as? State the purpose of conducting such a cross.
What is ecosystem? Mention its biotic components. Draw a diagram of four trophic levels food chain for a grassland ecosystem.
The following is the illustration of the sequence of ovarian events (a – i) in a human female.

Identify the figure that illustrates corpus luteum and name the pituitary hormone that influences its formation.