Q: What is the correct balanced chemical equation for oxygenic photosynthesis?

$$6CO_2 + 12H_2O + \text{light energy} \rightarrow C_6H_{12}O_6$ + 6O_2 + 6H_2O$$

Question 1

Which scientist's experiment demonstrated that the increase in mass of a willow tree over several years was not primarily due to the soil, but rather to another source?

Accepted Answer

Jan Baptista van Helmont

Question 2

What is the correct balanced chemical equation for oxygenic photosynthesis?

Accepted Answer

$$6CO_2 + 12H_2O + 	ext{light energy} ightarrow C_6H_{12}O_6$ + 6O_2 + 6H_2O$$

Question 3

Which of the following best describes the relationship between photosynthesis and cellular respiration in the biosphere?

Accepted Answer

Photosynthesis produces oxygen and glucose, which are used in cellular respiration; cellular respiration produces carbon dioxide and water, which are used in photosynthesis.

Question 4

Which of the following is a correct statement about the energy changes in photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis is endergonic (requires energy input), while cellular respiration is exergonic (releases energy).

Question 5

In the general equation for photosynthesis, $$CO_2 + 2H_2A$$ + 	ext{light energy} ightarrow (CH_2O)_n + $$A_2 + H_2O$, what does 'A' represent?

Accepted Answer

A is the electron donor, which can be oxygen, sulfur, or another element depending on the organism.

Question 6

Which of the following organisms is NOT capable of photosynthesis?

Accepted Answer

Fungi

Question 7

Where in a plant cell does the Calvin Cycle take place?

Accepted Answer

Stroma of the chloroplast

Question 8

Which of the following best explains why plants need mitochondria in addition to chloroplasts?

Accepted Answer

Mitochondria produce ATP for cellular functions not related to photosynthesis.

Question 9

Which of the following statements about the structure of the chloroplast is correct?

Accepted Answer

The stroma is the fluid-filled space outside the thylakoids where the Calvin Cycle occurs.

Question 10

A plant is placed in a sealed container with a burning candle. After a while, the candle goes out. When a mint plant is added and the candle is relit, it burns for several days. What is the best explanation for this observation?

Accepted Answer

The plant produces oxygen through photosynthesis, replenishing the air and allowing the candle to burn.

Question 11

Which of the following is a product of the light reactions of photosynthesis?

Accepted Answer

ATP

Question 12

Which of the following best describes the role of water ($$H_2O) in $$oxygenic photosynthesis?

Accepted Answer

Water donates electrons to the photosynthetic electron transport chain, resulting in the release of $$O_2.$$

Question 13

Which of the following is an example of an anoxygenic photosynthetic organism?

Accepted Answer

Purple sulfur bacteria

Question 14

What is the main function of the cristae in mitochondria?

Accepted Answer

To increase the surface area for ATP production during cellular respiration

Question 15

Which of the following best describes the flow of electrons in photosynthesis?

Accepted Answer

Electrons are boosted by photons and flow from water to NADP+, forming NADPH.

Question 16

Which of the following statements about the biosphere is correct?

Accepted Answer

The biosphere is the region on Earth and in the atmosphere where living organisms exist.

Question 17

A scientist discovers a new organism that uses $$H_2S$$ instead of $$H_2O as an $$electron donor in photosynthesis. What type of photosynthesis does this organism perform?

Accepted Answer

Anoxygenic photosynthesis

Question 18

Which of the following is a correct comparison between heterotrophs and photoautotrophs?

Accepted Answer

Photoautotrophs use light to make organic molecules, while heterotrophs must consume organic molecules to sustain life.

Question 19

Which of the following best explains why the mass of a plant increases during growth, according to van Helmont's experiment?

Accepted Answer

The mass comes primarily from water and carbon dioxide absorbed during photosynthesis.

Question 20

Which of the following is a direct product of the Calvin Cycle?

Accepted Answer

Sugars (such as glucose)

Photosynthesis: Historical Experiments, Mechanisms, and Cellular Context

Guida di studio - Domande di pratica

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