Evolution class 12. Evolution 2022-12-30

Evolution class 12 Rating: 7,4/10 827 reviews

Gulliver's Travels, written by Jonathan Swift in 1726, is a satirical novel that uses the fantastical story of a man's travels to different lands to comment on the society and politics of Swift's time. Through the character of Lemuel Gulliver, Swift pokes fun at the behaviors and customs of the people he encounters and presents a satirical view of human nature.

One of the main targets of Swift's satire in Gulliver's Travels is the political climate of Europe in the early 18th century. The Lilliputians, for example, are a small and petty society that is constantly at war with their neighbors, the Blefuscudians, over trivial matters such as which end of an egg to crack. This is a clear commentary on the constant state of conflict and territorial disputes that plagued Europe at the time. Similarly, the giant inhabitants of Brobdingnag are depicted as being far more rational and civilized than the Europeans, suggesting that Swift saw the societies of his time as being overly focused on power and conquest rather than on the well-being of their citizens.

Another aspect of society that Swift satirizes in Gulliver's Travels is the inherent pride and vanity of human beings. The Laputans, for example, are a society of intellectuals who are so consumed by their own theories and ideas that they are completely out of touch with reality. Their obsession with abstract thought and their disregard for practical matters is meant to be a commentary on the intellectual elite of Swift's time, who he saw as being overly concerned with their own status and reputation rather than with the needs of society as a whole.

In addition to these broad themes, Swift also uses Gulliver's Travels to mock specific aspects of 18th century society, such as the emphasis on etiquette and social status. The Houyhnhnms, a race of intelligent horses, are portrayed as being much more civilized and rational than the humans they encounter, and they view the latter's obsession with status and appearance as childish and foolish. This is a clear commentary on the shallow and superficial nature of society at the time.

Overall, Gulliver's Travels is a satirical work that uses the story of a man's travels to different lands as a means of commenting on the flaws and shortcomings of 18th century European society. Through the character of Gulliver, Swift pokes fun at the petty politics and superficial concerns of the people he encounters, presenting a scathing critique of human nature and the society in which he lived.

Biology on Evolution Class 12 Notes CBSE Biology Chapter 7 [PDF]

evolution class 12

They multiplied and now almost total population of mosquitoes became resistant to DDT. Same of them are tail bone coccyx , wisdom teeth, nictitating membrane, vermiform appendix, etc. Appetency in not involved. Explain with suitable example. Explain, ii The rate of appearance of new forms is linked to the lifespan of an organism. In addition to this, they mass transfer these genes, which give them resistance to bacteria, to other bacteria.

Next

Welcome to the Living World: Evolution

evolution class 12

With the help of any two suitable examples explain the effect of anthropogenic actions on organic evolution. For details, refer tothe above qustion. THEORIES OF EVOLUTION To understand and explain the process ofevolution various theories have been putforward by various scientists such as Lamarck,Darwin etc. Directional selection or Progressive selection: It produces a regular change within apopulation in one direction in respect to certaincharacteristics. The NCERT Solutions contain easy-to-understand language to help students score high marks in the board exams. He created electric discharge in a flask containing CH4, H2 and NH3 and water vapour at 8000C.

Next

NCERT Solutions For Class 12 Biology Evolution

evolution class 12

Then now the coal is replaced by the industries and oil and electricity is used. Non-random mating is between organisms with the same genotype or different genotypes. Ans: Recent studies on self consciousness says gibbons are the nearest to human in this respect. Delhi 2012 Answer: Fossils help us to know the morphological details of the organisms that were present in the past and relate them to the organisms of the present for better understanding the process of evolution. The theory that first form of life arose slowly through evolutionary forces from non-living molecules is called biogenesis. Pre-industrialisation period had more white winged moth against grey lichens on tree trunks.

Next

Evolution

evolution class 12

The original drifted population becomes founder and that effect is called founder effect. These founders carry on a limited portion ofthe parental gene pool. This represents the evolution of new forms in several directions from the common ancestral type divergence. Try tracing the outline first and then fill in the details. In the early part of the nineteenth century , before industrialization only the grey coloured forms of moths were present; the dark forms were rare. Cultivation of crops and domestication of animals observed. He gave the example of giraffe to evolve their neck by foraging leaves on tall trees and had to adapt by elongation of their necks.

Next

Chapter 7

evolution class 12

Alsothe appearance of new forms is linked to the lifespan of an organism. Besides, significant changes in flora and fauna, along with human beings, are also parts of evolution. Galaxies contain stars and clouds of dust and smoke. Big Bang Theory attempts to explain the origin of universe. Neanderthals became extinct about 40,000 years ago but contributed on average one to three percent to the genomes of present day Eurasians.

Next

Evolution Class 12 Important Questions and Answers Biology Chapter 7

evolution class 12

Mutations that occur in the sperm and eggs and can be passed down to offspring are germline mutations. They had brain capacity of 700 cc. Explain by giving reasons. Evolution of placental mammals has led to the evolution of a flying squirrel independently. This experimental evidence about the origin of life is called chemical evolution of life. It can be said that above organisms had different structures, but they came in the same environment and evolved to perform same function.

Next

CBSE Class 12 : Mechanism of Evolution

evolution class 12

In similar experiments, they observed the formation of sugars, nitrogen bases, pigments and fats. Brief Account of evolution About 2000 million ago first cellular form of life appeared on earth. All India 2013C Answer: Palaeontology is the study of past life based on fossil records. For example, wings of butterfly and birds. Describe one example of adaptive radiation.


Next

Important Questions Evolution Class 12 Biology

evolution class 12

List 10 modern-day animals and using the internet resources link it to a corresponding ancient fossil. Structures are anatomically similar but functionally different. Attempt to give a clear definition of the term species. Similarly of aa is q2 , of Aa 2pq. This is called founder effect and the original population is called founder.

Next