Factors Affecting The Microorganisms

The experiment shows Bread A is dry and Bread B is wet. After 1 week, bread B shows growth of mold. What inference (reasons) can you make from the experiment?

• Microorganisms need water to grow

• Microorganism need suitable temperature to grow

• Microorganisms need air to grow

• Microorganisms need nutrients to grow

Answer explanation

Moisture or presence of water helps the microorganisms to grow. No water, no microorganism.

Which food have a longer expiry date?

• home-cooked food

• bread in the packet

• fruits that have been cut

• dried food

The picture shows the food is being vacuumed. Why does the food pack like that?

• The presence of air helps the microorganisms to grow.

• For aesthetic purpose

• When there's no air, the food cannot stay longer

• Microorganisms is packed out from the food.

The picture shows Bottle A consists of sugar and yeast. Meanwhile, Bottle B only has yeast in it. After 10 minutes, the ballon on Bottle A expands. What is the inference that we can make from this experiment?

• When we add sugar, the balloon expands.

• Without sugar, microorganisms can live.

• Microorganisms will be active with the presence of nutrients.

• Microorganisms live in Bottle B

The pictures show milk and distill water. Both are leave in the Science Room for two days. After two days, the milk spoil. What is the inference (reasons) that we can make from this experiment?

• The presence of nutrients cause the microorganisms to be active.

• In the distill water, there are nothing.

• The milk spoil because it does not be put in the fridge.

• Microorganisms will be inactive in the distill water.

The picture shows several bottles of preserved food. Why do people preserve food?

• To make the food become more delicious

• To make the food last longer

• To make the food easily spoil

• To change the taste of the food based on my preference

Why preserved food can stay longer?

• The food is too salty or too sweet

• The acidity is not suitable for the microorganisms to grow.

• The microorganisms cannot live.

• The food got many water.

Which food will expire early?

• milk in the fridge

• fresh fish on the table

• fresh chicken in the freezer

• milk under the sun at 12.30 pm