From Sunlight to biomass

Question 1

what is a ecosystem?

Answer 1

• a community of living things together with their abiotic environment through which energy flows and matter is cycled
• energy comes in and out

Question 2

what is an autotroph

Answer 2

• autotroph = make it owns food
• e.g plants make their own glucose (photosynthesis)to gain nutrients energy source- light
• autotroph take 6 carbon dioxide molecules and 12 water molecules and using energy source they will convert these molecules to 1 molecule of glucose and 6 molecules of water

Question 3

what is chemosynthesis

Answer 3

chemosynthesis: energy source- chemical energy

Question 4

what is photosynthesis

Answer 4

takes place in two stages the light dependent stage and light independent stages

Question 5

explain the light-dependent stage

Answer 5

• happens on the thylakoid membranes of the grana
• chlorophyl in thylakoid
• use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH.

Question 6

explain the light-independent stage

Answer 6

• stroma of the chloroplasts
• Carbon dioxide is modified by series of chemical reactions to form carbohydrates.

Question 7

what are the 6 Steps of the Light dependent & dependent stage

Answer 7

1. 12 water molecules go into the thylakoid in the light dependent stage
2. 12 oxygen + 24 hydrogen atoms
3. power of sunlight hydrogen is split from oxygen
4. all oxygens through water molecules are thrown away as oxygen gas ( 6 oxygen molecules)
5. 6 carbon dioxide molecules go into light independent stage ( 6 carbons, 12 oxygens)
6. 1 glucose and half oxygens and 6 water molecules

Question 8

what is biomass and its job?

Answer 8

• producing organic compounds form inorganic compounds
• dry weight of an organism

Question 9

what are the two types of primary productivity

Answer 9

gross: amount of biomass

nett: biomass after its used its share of energy (glucose)