Extended Investigation Factors that affect the rate of photosynthesis
Plan, design and carry out an experiment to investigate the effect of a factor (other than temperature) that affects the rate of photosynthesis in a plant, for example light intensity or carbon dioxide concentration. Draw a graph to illustrate the relationship between the chosen factor and the rate of photosynthesis. The rate of photosynthesis will go on the y-axis.
8.2 Respiration
Mitochondrion Part of a cell that carries out respiration and produces energy in the cell.
All living things need energy to live. Plants and animals get energy from a chemical reaction called respiration. Respiration releases energy from food. It occurs in cells so it is called cellular respiration. Respiration occurs in the mitochondrion (plural: mitochondria) of the cell.
There are two types of respiration: 1. Aerobic respiration which requires oxygen
2. Anaerobic respiration which does not require oxygen.
Aerobic respiration Most living things carry out aerobic respiration. It is a process in which glucose is completely broken down in the presence of oxygen, producing carbon dioxide, water and a lot of energy.
Word equation for aerobic respiration: Glucose + Oxygen
Chemical equation for aerobic respiration: C6
H12 O6 + 6O2 Activity Demonstrate that respiring peas produce carbon dioxide 80
In this experiment you will demonstrate that cellular respiration produces carbon dioxide. When peas are germinating they carry out cellular respiration. When they are not germinating they do not carry out cellular respiration and do not produce carbon dioxide. Germination is when a plant grows from a seed.
Fig. 10 A mitochondrion.
Carbon dioxide + Water + Energy 6CO2 + 6H2 O + Energy
