During photosynthesis, plants use carbon dioxide and release:

Here are the answers to your Integrated Science questions:

1. During photosynthesis, plants use carbon dioxide and release:

   • B. Oxygen
   • Explanation: Photosynthesis is the process by which green plants use sunlight to synthesize foods from carbon dioxide and water. It produces glucose (food) and oxygen.

2. Which combination correctly shows the path of food in the digestive system?

   • B. Mouth $\rightarrow$ Oesophagus $\rightarrow$ Stomach $\rightarrow$ Small intestine
   • Explanation: Food enters through the mouth, travels down the oesophagus to the stomach, and then moves into the small intestine for further digestion and absorption.

3. A farmer adds compost manure to soil mainly to:

   • B. Increase soil nutrients
   • Explanation: Compost manure is rich in organic matter and essential nutrients, which it releases into the soil, improving soil fertility and plant growth.

4. Which part of the blood helps to fight diseases?

   • D. White blood cells
   • Explanation: White blood cells (leukocytes) are a crucial part of the immune system, identifying and destroying pathogens and foreign invaders in the body.

5. When a liquid changes into a solid due to loss of heat, the process is called:

   • Freezing or Solidification
   • Explanation: Freezing is the phase transition of a substance from a liquid to a solid state, which occurs when its temperature is lowered to its freezing point, causing it to lose heat energy.