2.9 IB Photosynthesis

Which of the following are products of the light dependent reactions of photosynthesis are utilized in the light-independent reactions?

• O₂ and glucose

• H₂O and O₂

• electrons and H+

• ATP and NADPH

Answer explanation

Take a look at your notes, it's all in there!

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Where does the light-independent reactions (Calvin cycle) take place?

• stroma of the chloroplast

• thylakoid membrane

• outer membrane of the chloroplast

• interior of the thylakoid membrane

Answer explanation

Some things you just have to know!

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When oxygen is released as a result of photosynthesis, it is a direct by-product of.....

• reducing NADP+

• photolysis

• chemiosmosis

• electron transfer in the Calvin cycle

Answer explanation

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What is the primary function of the light-independent reactions (Calvin cycle)?

• regenerate ATP for use in the light reactions of photosynthesis

• produce carbon dioxide for use in the light reactions of photosynthesis

• produce oxygen by oxidizing water

• produce simple sugars from carbon dioxide

Answer explanation

The Calvin Cycle assembles the glucose.

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Reactions that consume CO₂ take place in.....

• the light-dependent reactions of photosynthesis only

• the light-independent reactions of photosynthesis only

• the both the light-dependent and light independent reactions of photosynthesis

• neither the light-dependent and light independent reactions of photosynthesis

Answer explanation

Remember, the light dependent reaction (photolysis) is only concerned with breaking water apart.

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If an aquatic plant is placed into a test tube with water near a light source, what will it produce?

• Glucose and Oxygen

• Carbon dioxide and ATP

• Water and Oxygen

• Glucose and ATP

Answer explanation

It will produce the products of photosynthesis.

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Most plants appear green because chlorophyll.....

• absorbs green light.

• absorbs violet light.

• does not absorb green light.

• does not absorb violet light.

Answer explanation

Chlorophyll reflects green light.

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Which of the following molecules is not needed for the light-independent reactions of photosynthesis (Calvin Cycle)?

• CO₂

• ATP

• NADPH

• H₂O

Answer explanation

Water is needed for the light dependent reaction, it's products are needed for the light independent reaction.

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Plants with the largest amount of which pigment will be best suited for growing conditions where light has a green hue.

• Chlorophyll a

• Chlorophyll b

• Carotenoids

• A combination of all 3

Answer explanation

There is some light absorption for the carotenoids at the lower wavelengths of green-ish light.

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Which of the pigments in found in chlorophyll is most efficient at lower wavelengths?

• Chlorophyll A

• Chlorophyll B

• Carotenoids

• All three are equally efficient

Answer explanation

The answer is on the graph.

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