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NEET BIOLOGYEvolutionEasy

Question

Variations caused by mutation, as proposed by Hugo de Vries, are:

A

small and directionless

B

random and directional

C

random and directionless

D

small and directional

Step-by-Step Solution

Hugo de Vries, based on his work on evening primrose, proposed that mutations are the cause of evolution. He believed that mutations are random and directionless, whereas Darwinian variations are small and directional. De Vries argued that evolution is caused by sudden large mutations (saltation), rather than gradual accumulation of small variations .

Exam Context & Concepts Covered

This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Evolution. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

BIOLOGYEvolutionvariationscausedmutationproposed

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Given below are some stages of human evolution. Arrange them in the correct sequence (Past to Recent): A. Homo habilis B. Homo sapiens C. Homo neanderthalensis D. Homo erectus

A.A → D → C → B
B.D → A → C → B
C.A → C → D → B
D.D → C → A → B
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Which of the following is the correct sequence of events in the origin of life? I: Formation of protobionts. II: Synthesis of organic monomers. III: Synthesis of organic polymers. IV: Formation of DNA-based genetic systems.

A.I, II, III, IV
B.I, III, II, IV
C.II, III, I, IV
D.II, III, IV, I
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Among the human ancestors the brain size was more than 1000 cc in:

A.Homo neanderthalensis
B.Homo erectus
C.Ramapithecus
D.Homo habilis
EasySolve

Forelimbs of cat, lizard used in walking; forelimbs of whale used in swimming and forelimbs of bats used in flying are an example of:

A.Analogous organs
B.Adaptive radiation
C.Homologous organs
D.Convergent evolution
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Select the correct match regarding adaptive radiation of Australian marsupials corresponding to placental mammals

A.Numbat - Flying Squirrel
B.Tasmanian Wolf - Bobcat
C.Marsupial mouse - Mole
D.Spotted Cuscus - Lemur
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Panspermia, an idea that is still a favorite for some astronomers, means:

A.Creation of life from dead and decaying matter
B.Creation of life from chemicals
C.Origin of sperm in human testes
D.Transfer of spores as a unit of life from other planets to Earth
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In Australia, marsupials and placental mammals have evolved to share many similar characteristics. This type of evolution may be referred to as:

A.Adaptive Radiation
B.Divergent Evolution
C.Cyclical Evolution
D.Convergent Evolution
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Sweet potato and potato represent a certain type of evolution. Select the correct combination of terms to explain the evolution.

A.Homology, convergent
B.Analogy, divergent
C.Analogy, convergent
D.Homology, divergent
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