AT- c

Question 1

What are the various glassware equipment used in biology?

Answer 1

petri dish
beaker
test tubes
conical flask
volumetric flask
graduated cylinder
Funnels

Question 2

Why are conical flasks considered inaccurate?

Answer 2

They have inaccurate measurement markings, only a few markings
shapes which make them inaccurate for measurement purposes.

Question 3

Why is a volumetric flask more accurate for making up solutions?

Answer 3

Has a calibrated marking so the volume can be measured.

designed to hold a specific volume, top is narrow to prevent spillage and the bottom of the flask is round so solution/solute is well distributed

Question 4

Why are funnels considered useful?

Answer 4

have a narrow neck so only certain volumes or solutions can be transferred

Allows for solutions and liquids to be transferred from one glassware to another without spillages

Question 5

What and why is a serial dilution conducted?

Answer 5

step by step dilution of a substance in solution

It enables you to make solutions with very low concentrations without having to measure out very small volumes, improving accuracy

Question 6

Describe a method of conducting a dilution series

Answer 6

1) add one part … culture to eg. 9 part water

2) MIX

3) repeat using e.g 9 parts water and 1 part 10-1 + 10-2