Cell EnergySection 4.2

Warm upWhich of the following organisms use the sunlight as a source of energy to stay alive? Why?

Answer the following questions.

Why do you get hungry?

Why do we need energy?

How do we get energy?

Do all organisms get energy in the same way?

Objectives

Describe photosynthesis and cellular respiration.

Compare cellular respiration and fermentation

Label the following cell

Why chloroplasts are important?

What is photosynthesis

Photosynthesis

Getting energy from food

Animals get energy they need in two possible ways:

1- cellular respiration

2- fermentation

Cellular respiration

Needs oxygen

Use glucose and release CO2 and H2O

Energy produced is used in order to:

1- maintain body temperature

2- form ATP

Where do you think cellular respiration takes place?cIn prokaryotic cells cellular respiration takes place in the cell

In eukaryotic cells…Cellular respiration takes place in mitochondria

Cellular respiration chemical reaction

Connection between

photosynthesis and cellular

respiration

Look at the following and tell me what do you notice?

Fermentation

When muscle cells can’t get the oxygen needed for cellular respiration, they use the process of fermentation to get energy

Two types of fermentation 1- fermentation in muscles to produce lactic acid. Contribution of lactic acid in the muscle causes burning feeling and muscle fatigue.

2- Yeast forms carbon dioxide during fermentation. The bubbles of CO2 gas cause the dough to rise and leave small holes in bread after it is baked

Pop quiz1- plants use carbon dioxide (____), and water (______) in a process called (__________) so they produce their own food, mainly in the form of (___________).

2- The product of photosynthesis are (_________) and (_________) gas.

3- in cellular respiration, organisms use (________) and (______) gas in order to produce (________) which part of it is used to main (______ _______) and the other part to form energy in the form of (______)

4- cellular respiration takes place in the (____________) of prokaryotes and in the (________) of Eukaryotes.

5- Burning feeling in muscles is due to the production of (_______) which is produced via process known as (____)