Revision activity 1 1. Define the following terms: a) photosynthesis b) respiration. 2. Give two raw materials (natural substances) required for photosynthesis. 3. Study the diagram below of a simple leaf and provide the words corresponding letters \( A \) to E in the diagram.

Let's address each part of your revision activity step by step. ### 1. Define the following terms: a) **Photosynthesis**: Photosynthesis is the biochemical process by which green plants, algae, and some bacteria convert light energy, usually from the sun, into chemical energy stored in glucose. This process occurs primarily in the chloroplasts of plant cells, where carbon dioxide and water are used to produce glucose and oxygen, using sunlight as the energy source. The overall equation for photosynthesis can be summarized as: \[ 6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2 \] b) **Respiration**: Respiration is the metabolic process by which living organisms convert glucose and oxygen into energy, carbon dioxide, and water. This process occurs in the mitochondria of cells and is essential for producing ATP (adenosine triphosphate), which is used as an energy source for various cellular activities. The overall equation for aerobic respiration can be summarized as: \[ C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy (ATP)} \] ### 2. Give two raw materials (natural substances) required for photosynthesis. The two raw materials required for photosynthesis are: 1. Carbon dioxide (\(CO_2\)): This gas is absorbed from the atmosphere through the stomata of leaves. 2. Water (\(H_2O\)): This is absorbed by the roots from the soil and transported to the leaves. ### 3. Study the diagram below of a simple leaf and provide the words corresponding to letters \( A \) to \( E \) in the diagram. Since I cannot see the diagram you mentioned, I can provide common labels for parts of a simple leaf. Typically, the letters might correspond to the following parts: - \( A \): **Chloroplasts** (where photosynthesis occurs) - \( B \): **Stomata** (pores for gas exchange) - \( C \): **Xylem** (transports water) - \( D \): **Phloem** (transports nutrients) - \( E \): **Cuticle** (protective layer that reduces water loss) If you have specific labels in your diagram, please provide them, and I can help you identify them accurately.