Tag: darwin's theory of evolution
Questions Related to darwin's theory of evolution
Most important theory of general biology was proposed by :
-
Mendel and Morgan
-
Beadle and Tatum
-
Watson and Crick
-
Darwin and Wallace
The most important theory of general biology is the theory of evolution by natural selection. In the early 19th century Jean-Baptiste Lamarck (1744 – 1829) proposed his theory of the transmutation of species, the first fully formed theory of evolution. In 1858 Charles Darwin and Alfred Russel Wallace published a new evolutionary theory, explained in detail in Darwin's On the Origin of Species (1859).
Which was not proposed by Darwin?
-
Struggle for existence
-
Natural selection
-
Genetic drift
-
Survival of the fittest
The main concept of Darwin's theory was natural selection. Other main points were High rate of reproduction, Total number almost constant, Struggle for existence, Variations, Survival of the fittest. It didn't had genetic drift. Hence, option C is correct.
Darwin's theory of pangenesis proposes __________.
-
Some physical basis of inheritance.
-
Development of useful organs and degeneration of useful organs.
-
Increase in organ size with age
-
Development of organs due to will power.
In 1868, Darwin put forward the Theory of Pangenesis. According to this theory, every organ of the body produces minute hereditary particles, called gemmules or Pangenes, and they can be carried through the blood into the gametes. It laid emphasis on some basis of inheritance. Hence, Option A is correct.
Darwin in his 'Natural Selection Theory' did not belive in any role of which one of the following ?
-
Parasites and predators as natural enemies.
-
Survival of the fittest
-
Struggle for existence
-
Discontinuous variations
The main features of Darwin's theory of Natural Selection are as follows -
- Over production
- Struggle for existence
- Survival of the fittest
- Origin of new species
- Variations and hereditary
According to Darwin, which one is not of much importance in formation of species?
-
Over-production
-
Survival of the fittest
-
Struggle for existence and variations
-
Inheritance of acquired characters
Darwinism explains all except :
-
Within each species there are variations.
-
Variations are inherited from parents to offspring through genes.
-
Organisms tend to produce more offspring than can survive.
-
Organisms with better traits that overcome competition are best suited under the environment.
One of the major drawbacks of Darwin's theory is the absence of knowledge on inheritance. The genetic basis of evolution, cause of variations was not included in Darwin's 'Origin of Species'. It was only after the discovery of genes and traits by Mendel, genetics could be associated with evolution.
Original features of Darwin's finches in Galapagos islands were adapted for :
-
Flesh eating
-
Insect eating
-
Fish eating
-
Honey collecting
-
Seed eating
The small black birds found on Galapagos islands, which later came to be known as Darwin's finches were originally adapted with seed-eating features. From these many other forms evolved with altered beaks depending on the food habit. This enabled them to become insectivorous and vegetarian finches.
The naturalist Charles Darwin was inspired to write "Origin of Species" when the ship in which he was travelling reached :
-
Hawaii islands
-
Galapagos islands
-
Antartica
-
Great Barrier Reef
- Darwin reached the Galapagos islands on HMS Beage while travelling which is of historic importance.
- During his visit to the islands, Darwin noted that the unique creatures were similar from island to island, but perfectly adapted to their environments which led him to ponder the origin of the islands' inhabitants.
- So, Darwin's visit to the Galapagos Islands had a resounding impact on the formation of his Theory of Natural Selection.
Darwin's finches provide an excellent evidence in favour of evolution. This evidence comes from the field of ____________.
-
Anatomy
-
Biogeography
-
Embryology
-
Palaeontology
The 'Origin of Species' is written by
-
Linnaeus
-
Darwin
-
Hackel
-
Whittaker
- 'On the Origin of Species', published on 24th November 1859, is a work of scientific literature by Charles Darwin which is considered to be the foundation of evolutionary biology.
- Its full title was 'On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life'.
- Darwin's book introduced the scientific theory that natural selection and presented a body of evidence gathered from the Beagle expedition, stating that the diversity of life descended from a common ancestor through evolution.