WorksheetsIB Photosynthesis & Its Labs
Total questions: 10
Worksheet time: 41mins
Why do we 'infiltrate' the leaf discs with bicarbonate solution?
It decreases the density of the leaf discs so that they sink
It decreases the density of the leaf discs so that they float
It increases the density of the leaf discs so that they sink
It increases the density of the leaf discs so that they float
The infiltrated leaf discs rise during photosynthesis because....
the overall density of the disc increases
oxygen is released into the interior of the leaf which changes its buoyancy
they are trying to reach the CO2 in the atmosphere
the soap makes them become more buoyant
Which of the following is NOT a limiting factor for photosynthesis?
Light intensity
Concentration of CO2
Concentration of O2
Wavelength of light
Amount of water
In the 'Floating Leaf Disc Assay' lab, what is the main reason a soap solution used?
The soap wets the hydrophobic surface of the leaf allowing the solution to be drawn into the leaf
The soap provides the leaf with the needed density to sink
The soap breaks the cohesive hydrogen bonds in the solution allowing the leaf to move within the solution
The soap removes any dirt or soil from the leaf that they do not interfere with the results
Apart from photosynthesis, what other major process is taking part in the leaf disc at the same time?
cellular respiration
photolysis
the Calvin Cycle
hydrolysis
At approximately which wavelength does chlorophyll 'a' absorb most light?
660 nm
640 nm
455 nm
425 nm
Which gas is at the top of the inverted test tube?
oxygen
carbon dioxide
water vapor
nitrogen
Why is photosynthesis essential to life on Earth?
It converts unusable radiant energy into usable chemical energy
We need the CO2 removing from the air as it is a harmful greenhouse gas
It gives plants a purpose
It isn't essential as we have solar technology now
What type of organisms conduct photosynthesis?
Autotrophs
Heterotrophs
Biotrophs
Chemotrophs
How can we test for starch in leaves?
Using Benedict's solution
Using the Biuret test
Using iodine
Using Sudan III
