Key Stage 3 Biology: Photosynthesis

Flashcards covering key concepts from Key Stage 3 Biology on photosynthesis, including definitions, reactants, products, word equation, chlorophyll function, glucose uses, and producers in food chains.

What do the root words "photo" and "synthesis" mean?

"Photo" means light, and "synthesis" means to make.

What is the general definition of photosynthesis?

Photosynthesis is the process of making or producing food using light energy.

Which two main types of living things carry out photosynthesis?

Plants and algae.

How do land plants obtain water compared to water plants and algae?

Land plants take in water through their root hair cells, while water plants and algae take in water from their surroundings.

How does carbon dioxide enter land plants versus water plants and algae?

Carbon dioxide diffuses into the leaves of land plants, and diffuses into water plants and algae from their surroundings.

What waste product is released during photosynthesis?

Oxygen gas.

What specific substance is produced as food during photosynthesis?

Glucose, which is a type of sugar.

What is the summary word equation for photosynthesis?

$$\text{carbon dioxide} + \text{water} \rightarrow \text{glucose} + \text{oxygen}$$

What is the function of chlorophyll in photosynthesis?

Chlorophyll absorbs sunlight, which provides the energy needed for photosynthesis to happen.

What are the three main uses of glucose in a plant?

1. Respired to provide energy for the plant. 2. Stored for later use as starch. 3. Used to make new plant tissue for growth.

Why are plants and algae referred to as producers?

They are called producers because they produce food by photosynthesis, forming the starting point of food chains.

In the aquatic food chain example, what creature eats algae?

Plankton, which are tiny animals that look a bit like a shrimp.