- The whole class can do this experiment together. Take a piece of bread or roti. Sprinkle a few drops of water on it, and put it in a box. Close the box. See the bread or roti everyday until you find some changes on it. Make this table on a chart paper and put it up in the classroom. Fill up the chart every day after discussing the changes seen.
Day
Changes in the bread or roti
By touch
By smell
By looking through hand lens
By colour
1.
2.
3.
4.
5.
6.
- Find out the reason for these changes. From where did the fungus come on the bread?
-
Different kinds of food items spoil due to different reasons. Some foods spoil soon, some stay good for long. List some seasons and conditions in which food spoils quickly.
-
Given below are some food items and some simple methods by which these could be kept fresh for 1-2 days. Match the correct pairs:
Food items
Methods
Milk
Put in a bowl and keep the bowl in a container with some water.
Cooked rice
Wrap in a damp cloth.
Green coriander (Dhania)
Boil it.
Onion, garlic
Keep it in a dry open place
|
||||
|
Day |
Changes in the bread or roti |
|||
|
By touch |
By smell |
By looking through hand lens |
By colour |
|
| 1. | ||||
| 2. | ||||
| 3. | ||||
| 4. | ||||
| 5. | ||||
| 6. | ||||
- Find out the reason for these changes. From where did the fungus come on the bread?
-
Different kinds of food items spoil due to different reasons. Some foods spoil soon, some stay good for long. List some seasons and conditions in which food spoils quickly.
-
Given below are some food items and some simple methods by which these could be kept fresh for 1-2 days. Match the correct pairs:
Food items
Methods
Milk
Put in a bowl and keep the bowl in a container with some water. Cooked rice
Wrap in a damp cloth.
Green coriander (Dhania)
Boil it.
Onion, garlic
Keep it in a dry open place
- The purpose of this question is to make the students actively take part in day-to day activities. Keeping this in mind, it is strongly recommended that the students' prepare the solutions on their own.
-
The changes that can be seen in the bread slice are due to the presence of moisture. Moist bread is an excellent source of nutrition for fungus.
Fungi (plural of fungus) are tiny structures that keep floating in the air. These are too tiny to be visible to the naked eyes. However, when they land on moist bread, they begin to grow in a manner similar to that of a seed in moist soil. As they grow, they reproduce and spread over the surface of the bread.
-
Some seasons and conditions in which food spoils quickly are listed down.
(i) Rainy season having high moisture condition
(ii) Summer season having high temperature condition
-
Food items
Methods
Milk
Boil it
Cooked rice
Put in a bowl and keep the bowl in a container with some water
Green coriander (Dhania)
Wrap in a damp cloth
Onion, garlic
Keep it in a dry open place
- The purpose of this question is to make the students actively take part in day-to day activities. Keeping this in mind, it is strongly recommended that the students' prepare the solutions on their own.
-
The changes that can be seen in the bread slice are due to the presence of moisture. Moist bread is an excellent source of nutrition for fungus.
Fungi (plural of fungus) are tiny structures that keep floating in the air. These are too tiny to be visible to the naked eyes. However, when they land on moist bread, they begin to grow in a manner similar to that of a seed in moist soil. As they grow, they reproduce and spread over the surface of the bread.
-
Some seasons and conditions in which food spoils quickly are listed down.
(i) Rainy season having high moisture condition
(ii) Summer season having high temperature condition
| Food items | Methods |
| Milk | Boil it |
| Cooked rice | Put in a bowl and keep the bowl in a container with some water |
| Green coriander (Dhania) | Wrap in a damp cloth |
| Onion, garlic | Keep it in a dry open place |
