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SCIENCE

Note: Do all the written work in your science notebook.

1. Collect the wrapper of frozen or canned food.
- Write down the list of components of the food item.
- Find out about the preservatives present in these food items.
- What are the harmful effects of preservatives?

2. Make a list of household items in your home which are acidic, basic, and neutral.
- What is the use of these items?

3. Visit a farm, nursery, or garden nearby. Gather information about:
- Importance of seed selection
- Method of irrigation
- Effects of extreme cold and hot weather on the plants
- Fertilizers and manure used
- Agricultural practices which cause pollution

Activity: LPG: Use and Protection Procedure
- What precautions do your family members take during the use of cooking gas?
- What precautions do your family members take after using the cooking gas?
- If any leakage occurs, what steps should one take?
- Why is the LPG cylinder cylindrical in shape?
- Name the substances which cause smell in LPG.

4. Define the following terms with the help of your textbook:
1. Agriculture
2. Winnowing
3. Force
4. Pressure
5. Friction
6. Antibiotics
7. Vaccine
8. Fermentation
9. Pasteurization
10. Pathogens
11. Calorific value

Sagot :

GinnyAnswer

Final answer:

Preservatives in food items help prolong shelf life but may have harmful effects. Identifying acids, bases, and neutrals in household items is useful. Seed selection impacts plant growth, and agricultural practices can affect the environment.


Explanation:

Preservatives in Food Items:

Preservatives are added to frozen or canned food items to prolong their shelf life by inhibiting the growth of bacteria, yeast, and mold. However, some preservatives like sulfites can cause adverse effects such as allergic reactions, breathing difficulties, and headaches.

Acids, Bases, and Neutrals:

Acidic Household Items: Vinegar, Lemon Juice. Basic Household Items: Baking Soda, Ammonia. Neutral Items: Water, Sugar. These items serve various purposes like cleaning, cooking, and personal hygiene.

Importance of Seed Selection:

Seed Selection ensures optimal plant growth and yield. Methods of irrigation, effects of extreme weather, fertilizers, and manure utilization impact crop health, while unsustainable agricultural practices can lead to pollution.


Learn more about Preservatives in food items, Acids and bases in household items, Seed selection in agriculture here:

https://brainly.com/question/37641816


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