Q. If a person consumes 300 grams of carbohydrates in a day, what percentage of their total caloric intake (assuming 1 gram of carbohydrate = 4 calories) does this represent if their total intake is 2400 calories? (2020)
Q. If a person consumes 3000 calories a day and wants to ensure that 25% of their intake is from proteins, how many grams of protein should they consume (1 gram of protein = 4 calories)?
A.
150 grams
B.
200 grams
C.
250 grams
D.
300 grams
Solution
25% of 3000 calories = 0.25 * 3000 = 750 calories from proteins. 750 calories / 4 calories per gram = 187.5 grams, rounded to 188 grams.
Q. If a person has a 20% chance of contracting a disease and a 30% chance of recovery, what is the probability that the person will contract the disease and not recover? (2022)
A.
0.14
B.
0.06
C.
0.1
D.
0.2
Solution
Probability of contracting and not recovering = Probability of contracting × (1 - Probability of recovery) = 0.20 × (1 - 0.30) = 0.20 × 0.70 = 0.14.
Q. If a person needs 1500 mg of calcium daily and they consume 300 mg from one serving of yogurt, what percentage of their daily requirement is met by this serving? (2022)
Q. If a person needs 2500 calories a day and wants to get 20% of their calories from fats, how many grams of fat should they consume (1 gram of fat = 9 calories)?
A.
55 grams
B.
60 grams
C.
70 grams
D.
75 grams
Solution
20% of 2500 calories = 0.20 * 2500 = 500 calories from fats. 500 calories / 9 calories per gram = 55.56 grams, rounded to 56 grams.
Q. If a person needs 300 mg of calcium daily and a glass of milk provides 100 mg, how many glasses of milk must they drink to meet their daily requirement? (2020)
Q. If a person requires 2500 calories a day and they want to get 20% of their calories from protein, how many calories should come from protein? (2023)
Q. If a person requires 2500 calories a day and they want to lose weight, how many calories should they consume to lose 1 pound per week? (1 pound = 3500 calories) (2020)
A.
2000
B.
2200
C.
1800
D.
2400
Solution
To lose 1 pound per week, they need to reduce their intake by 500 calories/day. So, 2500 - 500 = 2000 calories.
Q. If a test for a disease has a sensitivity of 90% and a specificity of 95%, what is the probability of a true positive result if the prevalence of the disease is 1%? (2022)
Q. If a test for a disease has a sensitivity of 90% and a specificity of 95%, what is the probability that a person who tests positive actually has the disease, given that the prevalence is 1%? (2022)
Q. If a trait is controlled by a single gene with two alleles, where A is dominant over a, what is the expected phenotypic ratio in the offspring of a cross between Aa and aa?
A.
1:1
B.
3:1
C.
2:1
D.
1:2
Solution
The cross Aa x aa will produce offspring in a 1:1 phenotypic ratio (A:a).
Q. If a trait is sex-linked and recessive, what is the probability that a son will express the trait if his mother is a carrier and his father does not have the trait?
A.
0%
B.
25%
C.
50%
D.
100%
Solution
The son will inherit the X chromosome from his mother. If she is a carrier (X^HX^h), there is a 50% chance he will inherit the X^h and express the trait.
Q. If a treatment is effective in 80% of cases, what is the probability that it will be effective for at least one out of three patients? (2023)
A.
0.512
B.
0.8
C.
0.2
D.
0.64
Solution
Probability that treatment is not effective for one patient = 1 - 0.8 = 0.2. For three patients, the probability that it is not effective for all = 0.2^3 = 0.008. Therefore, the probability that it is effective for at least one = 1 - 0.008 = 0.992.
Q. If a vaccine reduces the risk of infection by 75%, what is the probability of infection after vaccination if the initial probability of infection is 0.1? (2020)
A.
0.025
B.
0.075
C.
0.1
D.
0.5
Solution
The new probability of infection after vaccination = Initial probability × (1 - reduction) = 0.1 × (1 - 0.75) = 0.1 × 0.25 = 0.025.
Biology is a crucial subject for students preparing for school exams and competitive tests in India. Understanding biological concepts not only helps in grasping the fundamentals of life sciences but also enhances your ability to tackle objective questions effectively. Practicing MCQs and objective questions in Biology is essential for scoring better, as it allows you to apply your knowledge and identify important questions that frequently appear in exams.
What You Will Practise Here
Cell Structure and Function
Genetics and Heredity
Human Anatomy and Physiology
Plant Biology and Ecology
Microbiology and Biotechnology
Evolution and Biodiversity
Important definitions and key formulas
Exam Relevance
Biology is a significant part of the curriculum for CBSE, State Boards, NEET, and JEE. In these exams, you can expect a variety of question patterns, including multiple-choice questions that test your understanding of key concepts, definitions, and applications of biological theories. Familiarity with important Biology MCQ questions will give you an edge in both school assessments and competitive exams.
Common Mistakes Students Make
Confusing similar terms, such as mitosis and meiosis.
Overlooking the importance of diagrams in understanding processes.
Misinterpreting questions that require application of concepts rather than rote memorization.
Neglecting to review key definitions and their implications.
FAQs
Question: What are the best ways to prepare for Biology MCQs? Answer: Regular practice with objective questions, reviewing key concepts, and understanding diagrams are effective strategies.
Question: How can I improve my accuracy in answering Biology objective questions? Answer: Focus on understanding concepts rather than memorizing facts, and practice with past exam papers to familiarize yourself with question patterns.
Start solving practice MCQs today to test your understanding and boost your confidence in Biology. Remember, consistent practice is the key to mastering this subject and achieving your exam goals!
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