A trash can contains the following materials.
- Plastic straw
- Aluminium foil
- Tissue paper
- Glass bottles
- Chicken bones
Select the materials from the list that can be decomposed by microbes.
Important Questions on Microorganisms: Friend and Foe
Suman wants to see how quickly carrots lose colour. Loss of colour shows rotting of carrot. She observes carrot slices on a plate under three different conditions as shown below.
She notes how long the carrot slices on each plate take to change colour.
| Under the sun | In a moist room at 25°C | In the refrigerator | |
| Time carrot slices take to change colour | 2 days | 5 days | 8 days |
What can Suman conclude from her activity?
Suman wants to see how quickly carrots lose colour. Loss of colour shows rotting of carrot. She observes carrot slices on a plate under three different conditions as shown below.
She notes how long the carrot slices on each plate take to change colour.
| Under the sun | In a moist room at 25°C | In the refrigerator | |
| Time carrot slices take to change colour | 2 days | 5 days | 8 days |
Use the results of the activity to finish the graph below. The first bar is drawn for you. Put a label in the space provided for the axis on the left.
Manoj adds some yeast to two test tubes containing sugar solution. One test tube is kept in ice and the other at room temperature. The picture shows what happens after three hours.
What is Manoj investigating?
Manoj adds some yeast to two test tubes containing sugar solution. One test tube is kept in ice and the other at room temperature. The picture shows what happens after three hours.
How can Manoj confirm if the gas produced in the test tube at room temperature was due to the yeast growing in it?
Manoj adds some yeast to two test tubes containing sugar solution. One test tube is kept in ice and the other at room temperature. The picture shows what happens after three hours.
What should Manoj keep the same in both the test tubes for a fair experiment?
