Some examples from this set of practice questions
1.
List 5 factors / materials that are needed for photosynthesis to take place.
Answer: Any 5: - chlorophyll - enzymes - optimum temperature - water - carbon dioxide - radiant energy / light
2.
Define: osmosis
Answer: The movement of water molecules from where there is a high to where there is a low concentration of water.
3.
In 4 steps, describe how water moves from the soil into the leaves of the plant for photosynthesis.
Answer: 1. Water is absorbed into the root hairs of the plant by osmosis. 2. It moves into the xylem and into the leaves by the transpiration pull. 3. It passes down a diffusion gradient to enter the mesophyll cells. 4. Moves into chloroplasts by osmosis.
4.
Why is it beneficial for the cuticle / epidermal cells to be transparent?
Answer: It allows radiant energy to penetrate to the mesophyll layer where the chloroplasts are found so that photosynthesis can take place.
5.
Is photosynthesis a catabolic or anabolic process? Give a reason for your answer.
Answer: Anabolic. Simple molecules (water and carbon dioxide) are used to produce a more complex molecule (glucose).
6.
Give another name for the light-dependent stage.
Answer: Photochemical stage.
7.
In what 2 ways is the trapped energy used?
Answer: 1. Split water molecules into energised hydrogen atoms and oxygen gas through photolysis. 2. Form ATP through phosphorylation.
8.
Give the precise location where the enzymatic stage takes place.
Answer: - In the mesophyll layer of the leaf. - In the chloroplasts. - In the stroma.
9.
What substances are used to produce glucose in the dark phase?
Answer: 1. Energised hydrogen atoms. 2. Carbon dioixde.
10.
Give a term which refers to: the series of enzymatic reactions that combine energy-rich hydrogen atoms with carbon dioxide to form glucose.
Answer: Calvin cycle.
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