Free Introduction to Biology MCQs with Answers

71. Life of today has come into existence through?

• A. Biodiversity
• B. Phyletic lineage
• C. Science
• D. Fossil

Explanation: The correct answer is 'phyletic lineage.' This term refers to the evolutionary history and development of a species or group of organisms. It explains how life has evolved from simple to more complex forms over time through a continuous sequence of ancestral and descendant species. The other options are incorrect because 'Biodiversity' relates to the variety of life forms, 'Science' is a method of acquiring knowledge, and 'Fossil' refers to remains of past organisms without explaining the process of evolution.

72. What is systematized knowledge known as?

• A. Religion
• B. Philosophy
• C. Science
• D. Imagination

Explanation: This question tests understanding of scientific methodology, relevant for medical students in biochemistry and related fields. Science is completely correct, as it represents systematized knowledge through empirical methods. Other options reflect belief, reasoning, or creativity, which do not align with the definition.

73. The term that includes the rest of the others?

• A. Biology
• B. Physics
• C. Chemistry
• D. Science

Explanation: The correct answer is science because it is the broader field that encompasses all the other disciplines listed-biology, physics, and chemistry. These are specialized branches within the broader category of science. Therefore, science is the term that includes the rest. Biology, physics, and chemistry are specific disciplines within science, focusing on particular aspects of the natural world, and do not encompass the other fields.

74. Which of the following is not a characteristic of a hypothesis?

• A. Experiments can prove it true or false
• B. It can be converted into a theory or a law
• C. It is less explanatory than a theory or law
• D. It is always a religious idea

Explanation: The correct answer is Option D: A hypothesis is not always a religious idea. Scientific hypotheses are propositions or explanations that are testable through observation and experimentation, and they are fundamentally different from religious ideas, which are based on faith rather than empirical evidence.Option A is incorrect because a fundamental characteristic of a scientific hypothesis is that it must be testable, meaning it can be proven true or false.Option B is incorrect, as while a hypothesis can contribute to the development of theories or laws if supported by ample evidence, it itself is not directly 'converted' into them without substantial validation.Option C is incorrect because a hypothesis is indeed less explanatory than a theory or law, which is established based on extensive testing and evidence.

75. Which of the following is true for deductive reasoning?

• A. It moves from general to specific
• B. It draws specific conclusions from some general principle
• C. It is used to devise a hypothesis
• D. All of these

Explanation: Deductive reasoning is a logical process where conclusions are drawn from a set of premises that are generally assumed to be true. It involves moving from a general statement or principle to a specific conclusion. Therefore, all the given options describe aspects of deductive reasoning: it moves from general to specific, draws conclusions from general principles, and can be involved in hypothesis testing, making Option D the correct choice. Option A and Option B are descriptions of deductive reasoning, while Option C suggests that deductive reasoning is primarily used to devise hypotheses, which is more aligned with inductive reasoning.

76. A hypothesis is a result of deductive reasoning, or it can be the consequence of?

• A. Inductive reasoning
• B. Intuition
• C. Esthetic preference
• D. All of these

Explanation: The correct answer is all of these. Hypotheses can be formed through various methods, including deductive reasoning, which involves starting with a general statement and examining the possibilities to reach a specific, logical conclusion. Additionally, inductive reasoning, where specific observations lead to broader generalizations, can also aid in hypothesis formation. Intuition plays a role as well, offering non-logical insights that can lead to hypotheses. Esthetic preferences, while not scientific, may inspire hypotheses based on what is perceived as more elegant or coherent. The other options alone do not encompass all the potential influences on hypothesis formation.

77. Scientific way to form a hypothesis?

• A. Intuition
• B. Aesthetic preference
• C. Comparison and analogy with other processes
• D. All of these

Explanation: The correct answer is Option D: 'All of these.' In scientific research, forming a hypothesis is not solely based on one method or approach. While scientific methods rely heavily on empirical evidence and logical reasoning, intuition, aesthetic preferences, and analogies also play a role in guiding scientists towards potential hypotheses. Intuition can guide initial thoughts, aesthetic preferences can make certain hypotheses more appealing, and analogies can help relate unknown phenomena to known concepts. Although these factors are not sufficient alone for scientific validation, they are part of the creative process in hypothesis formation. Hence, all mentioned aspects contribute to forming a hypothesis, making Option D correct.

78. Which statement is considered a tentative explanation of an observation?

• A. Theory
• B. Hypothesis
• C. Law
• D. Deduction

Explanation: The correct answer is hypothesis. A hypothesis is a proposed explanation for an observation, which can be tested through experimentation and further study. It is considered 'tentative' because it is not yet verified. The other options are incorrect, as they represent different aspects of scientific inquiry: a theory is a well-established explanation, a law describes phenomena, and deduction is a logical process rather than an explanation.

79. A series of hypotheses supported by the results of many tests is called what?

• A. Deduction
• B. Theory
• C. Scientific Law
• D. All these

Explanation: The correct answer is "theory." "In science, a theory is a comprehensive explanation of some aspect of the natural world that is supported by a vast body of evidence. It is not simply a hypothesis or a guess but is based on a series of tested and validated hypotheses.Deduction is not the right choice, as it involves logical reasoning rather than the development of hypotheses. Scientific law describes phenomena that always occur under certain conditions but does not explain why they occur, as a theory does. All of these are incorrect because only a theory fits the description given in the question.

80. Which branch of science is short on laws?

• A. Biology
• B. Physics
• C. Chemistry
• D. All of these

Explanation: The correct answer is biology. Biology is the study of living organisms, which are inherently complex and diverse, making it challenging to formulate universal laws that apply to all life forms. In contrast, physics and chemistry are fields with well-established laws that describe fundamental principles governing matter and energy. Physics, for example, includes Newton's laws and the laws of thermodynamics, while chemistry includes the periodic law and the law of conservation of mass. Therefore, biology is relatively short on universal laws compared to physics and chemistry.