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Origin and Evolution of Life Quiz-19

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NEET is the most famous and important medical entrance examination held in our country. This exam is an objective type, an offline test which includes 4 sections namely– Physics, Chemistry, Botany, and Zoology. The maximum marks that can be scored are 720 marks and have 180 questions. About half of the paper consists of questions from Biology, as the NEET exam essentially focuses on capacitating students to go for seats in medical courses. One of the most significant and crucial sections in the NEET exam is of Biology. It comprises of theories, descriptions, discoveries, diagrams, definitions, explanations of differences, and relations. The majority of the topics covered in the NEET syllabus are from the NCERT syllabus of Class 11 & 12 and other related sources become part of the rest of the syllabus. Clear Exam curates a list of articles selected by professionals who recommend the highly vital topics for NEET exams. The table below takes you directly to the respective topic where the in-depth article and the MCQs are available for an easy and productive learning experience. Prior to solving NEET question papers or practicing mock tests, you must ensure to study the basic concepts in NEET and practice a few sample questions related to this exam. Students will be covered for all their studies as the topics are available from basics to even the most advanced. .

Q1. The ratio of methane, ammonia and hydrogen in Stanley Miller’s experiment was
  •  3 : 1 : 2
  •  2 : 1 : 2
  •  1 : 2 : 1
  •  5 : 4 : 1
Solution
  





Q2. In a random mating population in equilibrium, which of the following brings about a change in gene frequency in non-directional manner?
  •  Selection
  •  Migration
  •  Mutation
  •  Random drift
Solution
Given certain conditions, the allele frequencies remain constant from generation to generation. Under these conditions, a population would be in equilibrium and there will be no evolutionary change. However, many evolutionary changes usually occurs, following the appearance of new alleles and source of this mutation.

Q3. The theory of pangenesis was rejected due to the acceptance of
  •  Spallanzani theory of biogenesis
  •  Richter theory of cosmozoic
  •  Cuvier theory of catastrophism
  •  Weismann theory of germplasm
Solution
Darwin’s theory of inheritance was referred to pangenesis theory. Weismann (1900) suggested that reproductive cells have the germplasm and they pass traits to the next generation. As the traits of somatoplasm do not transmit to next generation, they are not found in the offsprings. This is the basis of present day chromosomal theory of inheritance.

Q4. Which of the following is the first vascular plant to be represented by an extinct group?
  •  Bryophytes
  •  Lycopods
  •  Conifers
  •  Cycads
Solution
The lycophytes separated from the rest of the early land plants, evolved adequate reproductive, supportive, and transport systems. Three groups of extinct vascular plants were prevalent in Devonian times; the rhyniophytes, zosterophylls, and trimerophytes. The oldest known vascular plant is Cooksonia, a 6.5 centimeter- tall plant with dichotomously branched (forking into two) leafless stems with sporangia at their tips. Only bits and pieces have so far been recovered and no rhizomes or below ground parts have been found. It is a rhyniophyte and its relatives were extinct by mid-Devonian time

Q5.Why is the advent of reproductive isolation is important from an evolutionary standpoint
  •  When the organisms comprising two population of a species can no longer interbreed, the            flow of genetic material between them stops
  •  It is not important from an evolutionary standpoint. The question is based on a false assumption
  •  Reproductive isolation increases the mutational rate
  •  Reproductive isolation may slow down reproduction
Solution
 Reproductive isolation states the condition when two populations of a species can no longer interbred. As a result the flow of genetic material stops between them. This leads to the origin of new species

Q6. Homologous organs indicate the
  •  Convergent evolution
  •  Parallel evolution
  • Common descendent
  •  Natural selection
Solution
Homologous organis are those organs which have the same basic structure but different functions. These show common descendent and divergent evolution while analogous organs show convergent evolution.

Q7.A population containing a gene ‘X’ with two alleles ‘Aa’ is in Hardy-Weinberg equilibrium for gene ‘X’. If the gene frequency of allele ‘A’ is 0.2, allele frequency of ‘a’ is
  •  0.2
  •  0.42
  •  0.8
  •  1
Solution
  





Q8.Which group of organisms is believed to be evolved first on earth?
  •  Arthropods
  •  Coelenterates
  •  Protozoans
  •  Reptiles
Solution
Protozoa is a group of animal-like unicellular protists. From unicellular organisms, multicellular organisms arises. Coelenterata group to which Hydra and jellyfish belongs, would be more advanced than protozoans but more primitive than arthropoda, to which the grasshoppers belong. Reptiles are more advanced than the arthropods

Q9.Galapagos islands are located in
  •  Indian ocean
  •  Pacific ocean
  •  Atlantic ocean
  •  Arabian ocean
Solution
Galapagos islands consists of 14 main islands and numerous smaller islands which lies on the equator about 960 km of the west coast of south America in pacific ocean. These islands are vollcanic in origin and are called A living laboratory of evolution

Q10. Which fossil man has been known from Shivalik hills in India?
  •  Ramapithecus
  •  Zinjanthropus
  •  Shivapithecus
  • Pithecanthropus
Solution
Fossil of Shivapithecus reported from Shivalik hills (India) from the rocks of Miocene epoch (about 20-25 million years ago).

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