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Photosynthesis: Energy Transfer Process

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Questions and Answers

What is the primary function of photosynthesis?

To release energy for work in respiration

To produce ATP molecules for energy

To provide energy for chemoautotrophs

To convert light energy to chemical potential energy in organic molecules (correct)

Which organisms are known as photoautotrophs?

Single-celled protoctists and red algae

Nitrifying bacteria

Brown algae and chemoautotrophs

Green plants and photosynthetic prokaryotes (correct)

What is the primary source of hydrogen used in photosynthesis?

Starch

Water (correct)

ATP molecules

Carbon dioxide

Which organisms do not depend on light energy and use chemical energy sources for photosynthesis?

Nitrifying bacteria (C) Signup and view all the answers

What is the overall equation for photosynthesis in green plants?

$6CO_2 + 6H_2O + light ightarrow C_6H_{12}O_6 + 6O_2$ (A) Signup and view all the answers

What is the main product commonly formed in photosynthesis?

Starch (D) Signup and view all the answers

Which type of reaction in photosynthesis requires light energy?

Light-dependent reactions (A) Signup and view all the answers

What is the main purpose of the light-dependent reactions in photosynthesis?

To convert light energy into ATP (D) Signup and view all the answers

Which pigment is responsible for the green color of plants?

Chlorophyll a (D) Signup and view all the answers

What do carotenoids mainly absorb in the spectrum of light?

Red and blue-violet regions (A) Signup and view all the answers

What does an absorption spectrum graph represent for a pigment?

Absorbance of different wavelengths of light by the pigment (C) Signup and view all the answers

How does the action spectrum relate to the absorption spectrum in photosynthesis?

The absorption spectrum closely coincides with the action spectrum (D) Signup and view all the answers

What happens when the absorbed light energy excites electrons in the pigment molecules during photosynthesis?

The pigment releases excess energy as heat and light before returning to ground state (D) Signup and view all the answers

How does the absorption spectrum graph differ from the action spectrum graph?

Absorption spectrum shows absorbance, while action spectrum shows rate of photosynthesis. (C) Signup and view all the answers