Free BioInteractive Definition of Photosynthesis Questions and Answers — Questions and Answers
Question 1: What is the primary function of photosynthesis?
- Produce oxygen
- Convert light energy into chemical energy (Correct answer)
- Absorb carbon dioxide for respiration
- Break down glucose for energy
Correct answer: Convert light energy into chemical energy
The primary function of photosynthesis is to convert light energy from the sun into chemical energy. This chemical energy is then stored in organic molecules, primarily glucose, which serves as the main source of food and energy for plants and, indirectly, for most life on Earth.
Question 2: Where does photosynthesis primarily occur in plants?
- Mitochondria
- Nucleus
- Chloroplasts (Correct answer)
- Vacuoles
Correct answer: Chloroplasts
Photosynthesis primarily occurs in chloroplasts, which are specialized organelles found within the cells of plants and algae. These organelles contain chlorophyll and other pigments necessary to capture light energy, as well as the enzymes and structures required for both the light-dependent and light-independent reactions.
Question 3: What are the two main stages of photosynthesis?
- Glycolysis and Krebs Cycle
- Light-dependent reactions and Calvin Cycle (Correct answer)
- Respiration and Transpiration
- Electron transport chain and Fermentation
Correct answer: Light-dependent reactions and Calvin Cycle
Photosynthesis is broadly divided into two main stages: the light-dependent reactions and the Calvin Cycle (also known as the light-independent reactions). The light-dependent reactions capture light energy to produce ATP and NADPH, which are then used in the Calvin Cycle to fix carbon dioxide into glucose.
Question 4: Which molecule captures light energy during photosynthesis?
- NADPH
- Glucose
- Chlorophyll (Correct answer)
- ATP
Correct answer: Chlorophyll
Chlorophyll is the primary pigment responsible for capturing light energy during photosynthesis. Located within the thylakoid membranes of chloroplasts, chlorophyll absorbs specific wavelengths of light, particularly in the blue and red spectrum, initiating the energy conversion process.
Question 5: What is the main product of the Calvin Cycle?
- Oxygen
- Glucose (Correct answer)
- ATP
- NADPH
Correct answer: Glucose
The main product of the Calvin Cycle is glucose, a simple sugar molecule. During this cycle, carbon dioxide is fixed using the ATP and NADPH generated in the light-dependent reactions, ultimately synthesizing glucose which serves as the plant's primary energy source and building block for other organic compounds.
Free BioInteractive Definition of Photosynthesis Questions and Answers
What is the primary function of photosynthesis?