In Class 12 Boards there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Downloads of CBSE Class 12 Biology Chapter 7 Evolution Case Study and Passage-Based Questions with Answers were Prepared Based on the Latest Exam Pattern. Students can solve Class 12 Biology Case Study Questions Evolution to know their preparation level.
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In CBSE Class 12 Biology Paper, There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Evolution Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 12 Biology Chapter 7 Evolution
Case Study/Passage-Based Questions
Case Study 1: When the reptiles came down, mammals took over the earth. There’ were mammals in South America, which resembled some of the modern day mammals. But due to continental drift, they disappeared whereas the pouched mammals of Australia flourished and evolved into the various forms of pouched mammals that we see today.
What event led to the rise of mammals on Earth?
A) The arrival of birds
B) The disappearance of reptiles
C) Continental drift
D) The evolution of pouched mammals
Answer: B
What unique type of mammals flourished and evolved in Australia?
A) Rodents
B) Primates
C) Pouched mammals
D) Hoofed mammals
Answer: C
What is the primary reason cited for the disappearance of certain mammals in South America?
A) Predation by reptiles
B) Continental drift
C) Climate change
D) Overpopulation
Answer: B
Why did pouched mammals specifically thrive in Australia, according to the passage?
A) Lack of competition with other mammals
B) Favorable climate conditions
C) Protection from continental drift
D) The passage does not specify
Answer: D
Which of the following is a well-known example of a pouched mammal?
A) Elephant
B) Kangaroo
C) Whale
D) Tiger
Answer: B
Continental drift refers to:
A) The migration of animals between continents
B) The slow movement of Earth’s continents over geological time
C) The rapid sinking of continents into the ocean
D) The growth of continents due to volcanic activity
Answer: B
Which era in Earth’s history is commonly associated with the dominance of reptiles?
A) Paleozoic Era
B) Mesozoic Era
C) Cenozoic Era
D) Proterozoic Era
Answer: B
What is one of the effects of continental drift on the distribution and evolution of species?
A) It prevents species from migrating between continents
B) It causes instant changes in climate
C) It encourages hybridization between different species
D) It leads to the simultaneous evolution of identical species on different continents
Answer: A
Case Study 2: According to the Hardy-Weinberg principle, the allele frequencies in a population are stable and remain constant through generations. When the frequency differs from the expected values, the difference indicates the extent (direction) of evolutionary change. Disturbance in the genetic equilibrium or Hardy-Weinberg equilibrium in a population can be interpreted as resulting in evolution.
What does the Hardy-Weinberg principle describe?
A) The process of natural selection
B) The stability of allele frequencies in a population
C) The mechanism of genetic mutations
D) The rate of evolutionary change over time
Answer: B
If a population is in Hardy-Weinberg equilibrium, what can be said about the allele frequencies?
A) They change rapidly from generation to generation
B) They remain constant from generation to generation
C) They oscillate periodically
D) They follow a predictable pattern of change
Answer: B
What does a deviation from Hardy-Weinberg equilibrium suggest?
A) A population that is not evolving
B) A population that is evolving
C) A population that is experiencing genetic drift
D) Both B and C
Answer: D
Which of the following factors could disturb Hardy-Weinberg equilibrium?
A) Random mating
B) Large population size
C) Genetic mutation
D) Absence of migration
Answer: C
If the allele frequencies within a population remain constant over time, what can be concluded about the population?
A) It is undergoing rapid evolution
B) It is not undergoing evolution
C) It is experiencing a high rate of mutation
D) It is subject to strong selection pressures
Answer: B
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