Q: What is the balanced chemical equation for photosynthesis in plants?

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

Question 1

Which of the following best explains how photosynthesis changed Earth's atmosphere and influenced the evolution of aerobic respiration?

Accepted Answer

Photosynthesis released oxygen into the atmosphere, enabling the evolution of aerobic respiration.

Question 2

What is the balanced chemical equation for photosynthesis in plants?

Accepted Answer

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

Question 3

Which wavelengths of light are most effective in driving photosynthesis?

Accepted Answer

Red and blue wavelengths

Question 4

Why do most plants appear green to the human eye?

Accepted Answer

Chlorophyll reflects or transmits green light while absorbing red and blue light.

Question 5

Which of the following is the main photosynthetic pigment in plants, and what wavelengths does it absorb?

Accepted Answer

Chlorophyll a; absorbs violet and red light

Question 6

During the light-dependent reactions of photosynthesis, what is the primary function of the electron transport chain in the thylakoid membrane?

Accepted Answer

To pump H$$^+$$ ions into the thylakoid lumen, creating a proton gradient for ATP synthesis

Question 7

What is the role of photolysis in the light-dependent reactions of photosynthesis?

Accepted Answer

It splits water molecules to release oxygen, electrons, and protons.

Question 8

Which products of the light-dependent reactions are used in the Calvin Cycle?

Accepted Answer

ATP and NADPH

Question 9

What is the function of the enzyme rubisco in the Calvin Cycle?

Accepted Answer

It attaches carbon from CO$$_2 to $$RuBP, initiating carbon fixation.

Question 10

Which adaptation allows CAM plants to survive in arid environments?

Accepted Answer

They open their stomata and fix carbon at night.

Question 11

Photorespiration is considered wasteful for plants because:

Accepted Answer

It consumes O$$_2$$ and releases CO$$_2$$, using ATP without producing sugar.

Question 12

Which type of plants have adaptations to reduce photorespiration in hot, arid environments?

Accepted Answer

C4 plants, such as corn and sugarcane

Question 13

How do human activities contribute to global warming in relation to the carbon cycle?

Accepted Answer

By adding more CO$$_2 to $$the atmosphere than photoautotrophs can remove

Question 14

Which of the following best describes the relationship between autotrophs and heterotrophs in the context of solar dependency?

Accepted Answer

Heterotrophs depend on autotrophs for organic molecules produced using solar energy.

Question 15

Which process in photosynthesis directly results in the release of oxygen into the atmosphere?

Accepted Answer

Splitting of water molecules during the light-dependent reactions

Question 16

A scientist measures the rate of photosynthesis in a plant exposed to different colors of light. Which color would likely result in the lowest rate of photosynthesis and why?

Accepted Answer

Green, because chlorophyll reflects green light rather than absorbing it

Question 17

Which of the following is a waste product of the light-dependent reactions of photosynthesis?

Accepted Answer

Oxygen ($$O_2)$$

Question 18

In the process of chemiosmosis during photosynthesis, what drives the synthesis of ATP?

Accepted Answer

Diffusion of H$$^+$$ ions down their concentration gradient through ATP synthase

Question 19

Which of the following best describes the role of photosynthetic pigments in plants?

Accepted Answer

They absorb photons of specific wavelengths to initiate photosynthesis.

Question 20

A farmer wants to maximize crop yield in a greenhouse. Which strategy would most effectively increase the rate of photosynthesis in C3 plants?

Accepted Answer

Increasing the concentration of CO$$_2 in $$the greenhouse air

Photosynthesis: Mechanisms, Adaptations, and Ecological Impact

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