Chapter 5.6-Respiration

Question 1

What is photosynthesis?

Answer 1

physiological process used by plants, algae and some types of bacteria to convert light energy from sunlight into chemical energy

Question 2

What is autotrophic nutrition?

Answer 2

organisms which use chemical energy to synthesise large organic molecules, which form the building blocks of living cells, from simple inorganic molecules such as water and carbon dioxide

Question 3

What are organisms that photosynthesise called?

Answer 3

• photoautotrophs

- they use light as the energy source for autotrophic nutrition

Question 4

What is the general equation for photosynthesis?

Answer 4

• carbon dioxide + water + energy from plants==glucose +oxygen
• 6C02+6H20 ===C6H12O6+6O2

Question 5

What is respiration?

Answer 5

oxidation of stored organic molecules to release chemical energy

Question 6

Where can the stored organic molecules needed in respiration come from?

Answer 6

• photosynthesis

- digestion of complex organic molecules

Question 7

What are heterotrophs?

Answer 7

an organism deriving its nutritional requirements from complex organic substances

Question 8

What is the general chemical formula for respiration?

Answer 8

C6H12O6 + 6O2===6H2O + 6CO2 +(energy)

Question 9

What type of reactions are photosynthesis and respiration (endothermic or exothermic) and are they oxidation or reduction reactions?

Answer 9

• photosynthesis is an endothermic process, needs energy. Fixation of carbon needs electrons, and the addition of electrons is a reduction reaction
• respiration is an exothermic process as it releases chemical energy so it can drive the organisms metabolism. Glucose and other organic compounds are oxidised to produce carbon dioxide and water