Photosynthesis

Where does most of a plant's biomass come from?
from the soil
From carbon dioxide from the air and water from the soil
From nutrients in the soil
from water
At midday, what is happening in the leaf of a plant?
Respiration
Photosynthesis
Mainly photosynthesis and some respiration
None of the above
At midnight, what is happening in the leaf of a plant?
Respiration
Photosynthesis
Photosynthesis and respiration
None of the above
In which organisms does photosynthesis happen?
Plants
Animals
Plants and animals
None of the above
The end product(s) of photosynthesis in plants are oxygen plus:
Glucose
Starch
Starch and Sucrose
Water
The gas evolved in bubbling pond weed in the light is
Pure carbon dioxide
Pure oxygen
Air enriched with O2 plus CO2 and N2
None of the above
Thinking about photosynthesis and respiration in plants, which statement is correct
Photosynthesis is the opposite of respiration
Photosynthesis and respiration both occur in plants
Only photosynthesis occurs in plants
Respiration for maintenance and growth only occurs in the dark
Light energy captured by photosynthesis is used in a plant for the synthesis of:
Carbohydrates
Carbohydrates, Fatty acids and Proteins
Fatty Acids and Proteins
None of the above
Photosynthesis takes place in two separate but dependant series of steps, the light reactions and the photosynthetic carbon reduction cycle; this second cycle (also known as the dark reaction / light independent stage / or the Calvin-(Benson-Bassham)* cycle) of photosynthesis occurs:
Only in the dark in intact plants
In the light and dark in intact plants
Only in the light in intact plants, although will work in the dark in a test-tube
None of the above
During the aforementioned photosynthetic carbon reduction cycle, some oxygen also interacts with the primary enzyme to produce a waste product (phosphoglycollate). Photorespiration is a salvage pathway which recovers some of this carbon, the rest being released in a process called “photorespiration”. Photorespiration occurs:
Instead of conventional respiration processes in the light
At a higher rate than conventional respiration processes in the light
To generate ATP for maintenance and growth
Water used in photosynthetic light reactions:
Is a significant proportion of leaf water
Leads to dehydration and drought stress;
Only uses 2 mols H2O per mol O2 evolved, relative to 1000 water vapour mols transpired
The “Z” scheme in photosynthesis represents:
Photosystems I and II, and electron transport components, that are evenly distributed throughout higher plant chloroplast thylakoid membranes
How Photosystems I and II are spatially separated between thylakoid stacks and intrathylakoid lamellae, coupled by mobile electron carriers which shuttle back and forth through the membrane
Shows how electrons are dislodged from chlorophyll by photons and transferred through the pigment bed to each reaction centre
Rainforests are often described as the ‘lungs of the earth’ which statement is correct:
we need them to renew the oxygen we breathe each year
Purify pollutants from the air
Are virtually carbon/oxygen neutral as respiration = photosynthesis across an annual cycle in an untouched forest
Not sure
Stratospheric Ozone is thinning and a “hole” occurs over Antarctica, which:
Causes global warming by increasing radiation absorbed from sunlight
is caused by CO2 emissions
allows dangerous uv radiation to penetrate causing cancer and blindness in animals
Leads to atmospheric warming due to uv radiation
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