biology MCQs - 9th class Chapter 11 Mcqs

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

In biostatistics, which method is used to predict future outcomes based on current data?

A

Designing experiments

B

Drawing charts

C

Creating models

D

Taking average

3

Which of the following best describes the mean of a data set?

A

The most frequently occurring value

B

The middle value when data is ordered

C

The sum of all values divided by the number of values

D

The difference between the highest and lowest values

4

If a data set has no repeated values, what is the mode?

A

The highest value

B

The average of the data set

C

There is no mode

D

The median value

5

In a bar chart, what does the height or length of each bar represent?

A

The total number of categories

B

The value of the corresponding category

C

The average of all values

D

The difference between the highest and lowest values

6

When constructing a bar chart, which axis usually represents the categories?

A

Vertical axis (y-axis)

B

Horizontal axis (x-axis)

C

Both axes equally represent the categories

D

Neither axis represents the categories

7

Biostatistics is a branch of statistics that applies statistical methods to what field?

A

Geological sciences

B

Astronomical sciences

C

Biological sciences

D

Chemical sciences

8

According to the text, what is the first major use of biostatistics mentioned?

A

Analysing Biological Data

B

Interpreting Results

C

Designing Experiments and Studies

D

Predicting Outcomes

9

In a clinical trial, what do biostatisticians help determine to detect a significant effect?

A

The type of drug

B

The sample size

C

The age of participants

D

The duration of the study

10

Analysing the growth rates of plants under different environmental conditions is an example of which use of biostatistics?

A

Analysing Biological Data

B

Predicting Outcomes

C

Genetics

D

Agriculture

11

Interpreting the results of a survey on disease prevalence can guide what?

A

Public health interventions

B

Financial investments

C

Agricultural practices

D

Engineering designs

12

Predicting the spread of an infectious disease helps in planning what?

A

New clinical trials

B

Vaccination campaigns

C

Genetic research

D

Economic policies

13

Which field uses biostatistics to study the distribution and determinants of health and diseases in populations?

A

Genetics

B

Agriculture

C

Epidemiology

D

Clinical Trials

14

In agricultural research, biostatistics helps in comparing the yield of what?

A

Different farming equipment

B

Different soil types

C

Different wheat varieties

D

Different water sources

15

In a clinical trial, a new medication is often tested against what to determine its effectiveness?

A

A stronger medication

B

A placebo

C

A different disease treatment

D

No treatment at all

16

What is another name for the 'mean' of a data set?

A

The middle value

B

The most frequent value

C

The average

D

The range

17

What is the very first step to calculate the median of a data set?

A

Sum all the values

B

Find the most frequent value

C

Arrange the data in ascending order

D

Divide by the number of values

18

A data set with two modes is called what?

A

Unimodal

B

Multimodal

C

Bimodal

D

Non-modal

19

What is the primary purpose of a bar chart?

A

To show the relationship between two variables

B

To compare quantities of different categories

C

To display data over time

D

To show parts of a whole

20

To ensure a fair comparison, the bars in a bar chart should be of equal...?

A

Height

B

Color

C

Value

D

Width

21

For the data set 150, 160, 165, 155, 170, what is the mean height?

A

155 cm

B

160 cm

C

165 cm

D

170 cm

22

For the data set 150, 155, 160, 165, 170, what is the median?

A

155

B

160

C

162.5

D

165

23

For the data set 150, 155, 160, 165, what is the median?

A

155

B

160

C

157.5

D

162.5

24

What is the mode of the data set: 150, 160 (2), 165 (1), 155 (1)?

A

150

B

155

C

160

D

165

25

What is the term for a data set like 150, 160, 160, 155, 155, which has two modes?

A

Unimodal

B

Bimodal

C

No mode

D

Average

26

In the plant survey example, which species had the highest number of plants?

A

Species A

B

Species B

C

Species C

D

Species D

27

In the plant survey example, how many plants did Species C have?

A

10

B

15

C

20

D

25

28

Statistical analysis of data on COVID-19 infection rates is an example of which field?

A

Genetics

B

Epidemiology

C

Agriculture

D

Clinical Trials

29

What is the correct formula for the mean?

A

Sum of Data Points - Number of Data Points

B

Sum of Data Points / Number of Data Points

C

Sum of Data Points * Number of Data Points

D

Number of Data Points / Sum of Data Points

30

If the number of values (n) is odd, the median is the value at which position?

A

n/2

B

(n+1)/2

C

n

D

n-1

31

If a data set has an even number of values, the median is the average of the values at which positions?

A

n/2 and n/2 - 1

B

n and n+1

C

the first and last position

D

n/2 and (n/2) + 1

32

What is 'frequency' in the context of calculating the mode?

A

How large a value is

B

The average value

C

How many times a value appears

D

The middle value

33

A bar chart is what kind of representation of data?

A

Numerical

B

Textual

C

Graphical

D

Auditory

34

Biostatistics helps identify genetic markers linked to diseases like...

A

Influenza and Common Cold

B

Diabetes and Cancer

C

Malaria and Dengue

D

Fractures and Sprains

35

What does 'interpreting the results in a meaningful way' help to do?

A

Collect more data

B

Guide public health interventions

C

Design a new experiment

D

Calculate the mean

36

What must be done to the data before you can find the median?

A

It must be graphed

B

It must be averaged

C

It must be put in order

D

It must be squared

37

A 'statistically significant' result means the outcome is...

A

Not important

B

Likely not due to chance

C

A result of error

D

Expected and common

38

What is the mode of the data set: 10, 20, 30, 40, 50?

A

30

B

10

C

50

D

No mode

39

If the data set is 5, 8, 12, 15, 20, what is the median?

A

8

B

12

C

15

D

20

40

What is the mean of the data set: 7, 8, 9, 10, 11?

A

7

B

8

C

9

D

10

41

In the bar chart example, what does the y-axis represent?

A

Species of plants

B

Number of plants

C

Location of survey

D

Average plant height

42

What is the second step in creating a bar chart after gathering data?

A

Draw the axes

B

Arrange data into categories

C

Label the bars

D

Determine the scale

43

Which of these is NOT a major use of biostatistics mentioned in the text?

A

Designing Experiments

B

Analysing Biological Data

C

Financial Forecasting

D

Predicting Outcomes

44

The mean, median, and mode are measures that help to ____ and understand data sets.

A

complicate

B

summarize

C

hide

D

disperse

45

The mode is particularly useful for what kind of data?

A

Numerical data

B

Skewed data

C

Categorical data

D

Time-series data

46

What is the first step to calculate the mode?

A

Arrange data in order

B

Count the frequency of each value

C

Find the average

D

Find the middle value

47

In the data set of student heights (150, 160, 165, 155, 170), what is the range (difference between highest and lowest)?

A

5

B

10

C

15

D

20

48

The effectiveness of vaccines involves which type of methods?

A

Biostatistical methods

B

Engineering methods

C

Financial methods

D

Historical methods

49

The median is useful for understanding the middle value, especially with what kind of data?

A

Normal data

B

Categorical data

C

Bimodal data

D

Skewed data

50

In a bar chart, labeling each bar with its category name and value is done when?

A

At the beginning

B

At the end

C

In the middle

D

It is not necessary