Topic 1 -Size , Scale And Estimations And Units And Standard Form

Question 1

What is the formula for magnification of a light microscope?

Answer 1

Magnification of the eyepiece lens x magnification of the objective lens

Question 2

How can you calculate the size of an object using magnification?

Answer 2

Size of image / magnification = size of object

Question 3

What is standard form used for?

Answer 3

To handle very large or small numbers

Question 4

In standard form, what must the ‘number’ being multiplied by a power of 10 be between?

Answer 4

1 and 10

Question 5

Convert 1.5 × 10-5 to decimal form

Answer 5

0.000015

Question 6

Convert 3.4 × 10^3 to decimal form

Answer 6

3400

Question 7

If an object is 10 times bigger than another, how do we express this?

Answer 7

10’ times bigger

Question 8

If an object is 1000 times bigger than another, how do we express this?

Answer 8

10 times bigger

Question 9

How do we express an object that is 10 times smaller than another?

Answer 9

10-‘ times smaller

Question 10

What does the prefix ‘Centi’ multiply a unit by?

Answer 10

0.01

Question 11

What does the prefix ‘Milli’ multiply a unit by?

Answer 11

0.001

Question 12

What does the prefix ‘Micro’ multiply a unit by?

Answer 12

0.000001

Question 13

What does the prefix ‘Nano’ multiply a unit by?

Answer 13

0.000000001

Question 14

What is the purpose of estimations in Biology?

Answer 14

To estimate quantities when exact counting is impractical

Question 15

If a 1m x 1m square contains 15 dandelions, how do you estimate the number in a larger field measuring 50m x 50m?

Answer 15

Multiply 15 by the number of 1m x 1m squares that fit in the field

Question 16

How many 1m x 1m squares fit in a 50m x 50m field?

Answer 16

50

Question 17

Calculate the estimated number of dandelions in a 50m x 50m field if one 1m x 1m square contains 15 dandelions.

Answer 17

750 dandelions

Question 18

What is the estimate number mentioned?

Answer 18

750

The number 750 is described as an estimate, indicating that the actual number may vary.

Question 19

What happens as more squares are looked at?

Answer 19

The closer we will get to the real number

This suggests that increasing the sample size improves the accuracy of the estimate.

Question 20

True or False: The real number is guaranteed to be 750.

Answer 20

False

The text indicates that 750 is just an estimate, not a definite value.

Question 21

Fill in the blank: The more squares we look at (or ‘sample’), the _______.

Answer 21

closer we will get to the real number

This emphasizes the relationship between sample size and accuracy in estimation.