Question

the process of photosynthesis
photosynthesis is the synthesis or making of glucose from carbon dioxide and water using light energy absorbed by chlorophyll. the chlorophyll is found in chloroplasts. the structure of chloroplasts maximises the amount of light energy hitting the chlorophyll molecules.
light energy is converted into chemical energy. the glucose made is used for energy in respiration or stored as starch in the plant.
photosynthesis
co₂ + h₂o → c₆h₁₂o₆ + o₂
carbon dioxide + water → glucose + oxygen
notice that the splitting of water produces oxygen. the carbon dioxide is reduced to carbohydrate.

• carbon dioxide enters leaves through small holes called stomata. water and minerals are absorbed through the roots.
• photosynthesis also takes place in algae and in some bacteria. the bacteria do not use the same chemical process but they do use light energy.

factors that increase the rate of photosynthesis are: light intensity, the carbon dioxide level and the temperature.
test yourself

1. name the organelle that is the site of photosynthesis.
2. explain why water and carbon dioxide are needed for photosynthesis.
3. are organisms that use photosynthesis heterotrophic or autotrophic?
4. name the products of photosynthesis.

Explanation:

1. Chloroplasts are the organelles where photosynthesis occurs as they contain chlorophyll which absorbs light energy.
2. Water provides hydrogen and electrons, and is split to release oxygen. Carbon - dioxide is the source of carbon for the synthesis of glucose and other carbohydrates.
3. Organisms that use photosynthesis are autotrophic as they can produce their own food (glucose) using light energy, carbon - dioxide and water.
4. The products of photosynthesis are glucose and oxygen.

Answer:

1. Chloroplasts
2. Water provides hydrogen, electrons and oxygen. Carbon - dioxide is the carbon source for carbohydrate synthesis.
3. Autotrophic
4. Glucose and oxygen