Photosynthesis Flashcards
Terrariums are popular for growing houseplants.
A terrarium is a glass container containing soil and small plants.
Once established, a terrarium can be sealed and the plants will be able to grow for months or even years despite not being in contact with the outside atmosphere.
The terrarium maintains moist conditions for the plants.
Suggest one other reason why the plants in a sealed terrarium continue to grow.
respiration produces CO2 which can be used in photosynthesis
Cacti are popular house plants.
Suggest why cacti do not grow well in a terrarium.
Terrarium are moist conditions and cacti are xerophytes
During the light-independent stage of photosynthesis, triose phosphate (TP) is synthesised in the chloroplasts of plant cells.
State two possible uses of this molecule within the plant
amino acids
hexose sugars
From which molecule is TP synthesised during the light-independent stage?
glycerate-3-phosphate
Outline the importance of photosynthetic pigments in photosynthesis.
Photosynthesis pigments are important as they absorb light. Electrons are excited to higher energy level. Accessory pigments pass energy to primary pigments which can be oxidised for light dependent reaction.
Outline the structural differences between the Chromista chloroplasts and the chloroplasts found in flowering plants.
Chromista chloroplasts have fewer thylakoids
Chloroplast plants have starch grains and chromisât does not have starch grains.
On a sunny day more pondweed is at the surface of the water but on a cloudy day, less pondweed is at the surface.
Suggest an explanation for this.
On a sunny day there is greater light intensity, so more oxygen is produced during photosynthesis.
More oxygen means it is trapped within weed which increases buoyancy.
Describe two ways in which the structure of grana is adapted to its function
Grana contain chlorophyll pigments
Grana have a large surface area in small volume for maximum light absorption
Plants are autotrophs. Most other organisms are heterotrophs.
Outline the ways in which heterotrophic organisms are dependent on plants.
Autotrophs produce oxygen and glucose during photosynthesis.
Heterotrophs eat autotrophs to obtain organic material and the products can be used for respiration in autotrophs.
Name the primary photosynthetic pigment in photosystems
Chlorophyll A
Name an accessory pigment
Chlorophyll B and xanthophyll
State the advantage to the plant of having a range of accessory pigments in photosystems
Able to absorb a range of different light wavelengths
Where does the Calvin cycle take place?
stroma
What enzyme catalyses the fixation of carbon dioxide
Rubisco
What is the first stable product of carbon dioxide fixation
GP - glycerate(3–)phosphate;
