Test for Nutrition in Plants:
1. Observing Photosynthesis:
- Set up two potted plants, one placed under direct sunlight and the other in a dark room.
- Leave the plants for a few days, ensuring they are watered regularly.
- After a few days, observe the leaves of both plants.
- The plant exposed to sunlight should have green and healthy leaves, while the plant in the dark room may have yellow or wilted leaves.
- This experiment demonstrates the importance of sunlight in the process of photosynthesis, which is essential for plant nutrition.

2. Testing for Starch:
- Take a healthy green leaf and boil it in water for a few minutes.
- Remove the leaf from the boiling water and place it in a Petri dish.
- Add a few drops of iodine solution onto the leaf.
- If the leaf turns blue-black, it indicates the presence of starch, which is a product of photosynthesis.
- This test confirms that plants produce starch as a form of stored energy.

Test for Nutrition in Animals:
1. Food and Energy:
- Take two identical containers and place a small amount of food, such as bread or fruit, in each.
- Label one container "A" and the other "B."
- Place a small insect or worm in container A and seal it.
- Leave container B empty.
- Observe the insect's behavior and compare it with a similar insect in container B.
- If the insect in container A is active and shows signs of energy, while the insect in container B remains inactive, it indicates that animals obtain energy from food.

2. Digestive Enzymes:
- Take two test tubes and label them "A" and "B."
- Add a small piece of bread or any other food substance to each test tube.
- Add a few drops of saliva to test tube A, simulating the action of digestive enzymes in the mouth.
- Leave test tube B as a control with no added saliva.
- Observe the changes in the food substances over time.
- If the food in test tube A shows signs of digestion, such as becoming softer or breaking down, it indicates the presence of digestive enzymes in saliva.

Test for Acids, Bases, and Salts:
1. Testing pH:
- Take various samples of substances such as lemon juice, vinegar, baking soda solution, soap solution, and saltwater.
- Dip a pH paper or pH indicator strip into each sample.
- Observe the color change of the pH paper and compare it with a pH color chart.
- The pH paper will indicate whether the substance is acidic, alkaline (basic), or neutral.

2. Reactivity with Indicators:
- Take samples of different substances, including lemon juice, vinegar, baking soda solution, and saltwater.
- Add a few drops of universal indicator solution to each sample.
- Observe the color change of the indicator solution and compare it with a pH color chart.
- The color change will indicate the acidity or alkalinity of the substances.

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