Biostatistics is an important topic in biology that helps scientists collect, organize, analyze, and interpret biological data. In biological research and experiments, a large amount of information is gathered, and biostatistics provides methods to study this information in a clear and systematic way.
In this chapter, students learn how statistical tools are used to summarize data and present it in an understandable form. Concepts such as mean, median, mode, and graphical representation of data help researchers and students understand patterns and differences in biological information.
Biostatistics is widely used in many biological fields such as medicine, population studies, agriculture, and environmental research. By learning these concepts, students can better understand how scientists analyze results from experiments and make reliable conclusions.
These notes are prepared according to the Class 9 Biology 2026 new syllabus and include important explanations, examples, and key concepts to help students understand the chapter easily and prepare effectively for exams.
Class 9 Biology Chapter 11 MCQs – Biostatistics
1. What is the primary purpose of biostatistics?
a) To analyse financial data
b) To apply statistical methods to biological sciences ✅
c) To design engineering models
d) To study historical events
2. If the dataset is 5, 8, 12, 15, 20, what is the median?
a) 8
b) 12 ✅
c) 15
d) 20
3. Biostatistics is mainly used for:
Options:
(a) Drawing biological diagrams
(b) Designing experiments ✅
(c) Writing research papers
(d) Collecting fossils
4. The measure that gives an average of a data set is called:
(a) Median
(b) Mode
(c) Mean ✅
(d) Range
5. A dataset is said to be bimodal if:
(a) All values are equal
(b) It has two modes ✅
(c) It has no mode
(d) Median and mean are equal
Short Questions – Class 9 Biology Chapter 11 Biostatistics
1. Define biostatistics.
Answer:
Biostatistics is the application of statistical methods to biological and health-related studies. It is used to collect, organize, analyze, and interpret data in biological research and experiments.
2. What is the median of a dataset?
Answer:
The median is the middle value of a dataset when the values are arranged in ascending or descending order. It divides the dataset into two equal parts.
3. What is the importance of biostatistics in public health?
Answer:
Biostatistics is important in public health because it provides evidence-based insights for making health policies and guidelines. It helps scientists and health experts analyze data related to diseases, treatments, and population health.
4. What is a bar chart?
Answer:
A bar chart is a graphical representation of data that uses bars of different heights or lengths to compare different categories. It helps present data in a clear and easy-to-understand form.
Download Chapter 11 Notes – Biostatistics
Skip to PDF contentGet Class 9 Biology Chapter 11 complete notes for the 2026 new syllabus, including:
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Introduction to Biostatistics
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Mean, Median, and Mode
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Bar Chart and Graphical Representation
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Important MCQs, Short Questions, and Long Questions