Life Processes

Step 1: Body processes produce wastes. Step 2: These wastes can be harmful in excess. Step 3: Excretion removes them and allows cells to work normally.

Step 1: Water is a raw material for photosynthesis. Step 2: Xylem carries water from roots to leaves. Step 3: If xylem is blocked lack of water can reduce food formation.

Step 1: Leaves make food by photosynthesis. Step 2: Roots also need food for energy and growth. Step 3: If phloem is damaged food supply decreases.

Step 1: Digestion makes food simple. Step 2: Respiration releases energy from food. Step 3: Transport carries nutrients and gases to cells.

Step 1: The transport system brings substances from cells into blood. Step 2: Cells also produce wastes. Step 3: If excretion stops these wastes will not be removed.

Step 1: The body needs useful materials. Step 2: It needs to make energy and transport materials. Step 3: Without waste removal balance can be disturbed.

Step 1: In photosynthesis plants make food with help of light. Step 2: Oxygen is released as a by product. Step 3: Therefore oxygen release can be taken as evidence of photosynthesis.

Step 1: Fat may be present as large droplets. Step 2: Bile spreads it into smaller droplets. Step 3: Fat digesting enzymes can act more easily on smaller droplets.

Step 1: During filtration many small substances can pass out of blood. Step 2: Some useful substances and water may also be included. Step 3: Reabsorption helps the body save useful materials.

Step 1: Nutrition gives materials. Step 2: Respiration gives energy and transport carries materials. Step 3: Excretion removes wastes so all processes are connected.

Step 1: Life needs materials and energy. Step 2: The body changes materials and carries them to cells. Step 3: Removing wastes to maintain internal balance is equally necessary.

Step 1: Flaccid guard cells can close stomata. Step 2: Closed stomata reduce carbon dioxide entry. Step 3: Low carbon dioxide reduces food formation.

Step 1: Photosynthesis needs raw materials along with light. Step 2: Carbon dioxide is needed to form glucose. Step 3: Without glucose starch will not be formed.

Step 1: A leaf may already contain stored starch. Step 2: In darkness the plant uses up that starch. Step 3: Then the test shows newly formed starch.

Step 1: Light is necessary for photosynthesis. Step 2: Only the part receiving light can make food. Step 3: Therefore starch will be seen clearly in that part with iodine.

Step 1: Water vapour leaves when stomata remain open. Step 2: During high water loss the plant may close stomata. Step 3: This reduces carbon dioxide entry and photosynthesis.

Step 1: Salivary enzyme acts on starch in the mouth. Step 2: The stomach has an acidic medium. Step 3: This medium can stop the action of salivary enzyme.

Step 1: The stomach contains strong acid and digestive enzymes. Step 2: Mucus protects the inner wall from them. Step 3: Without mucus the wall may be damaged.

Step 1: Bile divides large fat droplets into smaller droplets. Step 2: This increases surface area. Step 3: Pancreatic enzymes can then act better on fat.

Step 1: Fat exists as large droplets. Step 2: Bile breaks it into smaller droplets and increases surface area. Step 3: Without bile enzymes act less effectively on fat.