Energy• All energy for life comes from the sun – Plants harvest the sun’s energy – Animals eat plants and the plant’s energy – Other animals eat those animals and consume their energy
Photosynthesis• Harvesting the sun’s energy and making food in the form of sugar (glucose)• Takes simple inorganic molecules (water, carbon dioxide) and makes organic molecules (glucose)
Photosynthesis• Location = Occurs in the chloroplasts; ONLY in plants, algae, some bacteriaFormula = CO2 + H2O + light Glucose + O2
Respiration• Taking the energy from food and storing it in molecules of ATP• ALL organisms perform respiration! Energy in Food Energy Available for Life Processes
Respiration• Location = Occurs in the mitochondria; in ALL living organismsFormula = Glucose + O2 CO2 + H2O + energy – Oxygen allows more ATP to be produced This formula is photosynthesis backwards!
ATP Molecules• Organisms use the energy in these molecules to gather, move, and breakdown materials• Waste is also removed using the energy in ATP
Feedback Mechanisms in Plants• GUARD CELLS regulate STOMATA to let out OXYGEN and take in CARBON DIOXIDE – Gas Exchange – guard cells letting CO in and 2 Oxygen out – Transpiration – water evaporating out of the leaves
The energy found in ATP molecules synthesizedin animal cells comes directly from1. sunlight2. organic molecules3. minerals4. inorganic molecules
Which activity occurs in the process ofphotosynthesis?1. Chemical energy from organic molecules is converted into light energy.2. Organic molecules are obtained from the environment.3. Organic molecules are converted into inorganic food molecules.4. Light energy is converted into the chemical energy of organic molecules.
A green plant is kept in a brightly lit area for 48hours. What will most likely occur if the lightintensity is then reduced slightly during the next 48hours?1. Photosynthesis will stop completely.2. The rate at which nitrogen is used by the plant will increase.3. The rate at which oxygen is released from the plant will decrease.4. Glucose production inside each plant cell will increase.
ATP is a compound that is synthesized when1. chemical bonds between carbon atoms are formed during photosynthesis2. energy stored in chemical bonds is released during cellular respiration3. energy stored in nitrogen is released, forming amino acids4. digestive enzymes break amino acids into smaller parts
Organisms that have the ability to use anatmospheric gas to produce an organic nutrientare known as1. herbivores2. decomposers3. carnivores4. autotrophs