Free BioInteractive Structure of Chloroplasts Questions and Answers — Questions and Answers
Question 1: What is the primary function of chloroplasts in plant cells?
- Protein synthesis
- Cellular respiration
- Photosynthesis (Correct answer)
- Water storage
Correct answer: Photosynthesis
The primary function of chloroplasts in plant cells is to carry out photosynthesis. These specialized organelles contain chlorophyll and other necessary components to capture light energy and convert it into chemical energy in the form of glucose.
Question 2: Which structure within the chloroplast contains chlorophyll?
- Stroma
- Thylakoid membrane (Correct answer)
- Outer membrane
- Inner membrane
Correct answer: Thylakoid membrane
Chlorophyll, the pigment essential for absorbing light energy during photosynthesis, is embedded within the thylakoid membranes inside the chloroplast. These membranes are the site where the light-dependent reactions occur, converting light energy into chemical energy.
Question 3: What is the stroma in a chloroplast?
- The fluid-filled space inside the thylakoids
- The dense fluid surrounding the thylakoids (Correct answer)
- The outermost layer of the chloroplast
- The space between the inner and outer membranes
Correct answer: The dense fluid surrounding the thylakoids
The stroma in a chloroplast is the dense, fluid-filled space that surrounds the thylakoids and grana within the inner membrane. It is the location where the light-independent reactions, or the Calvin Cycle, take place, utilizing the ATP and NADPH produced by the thylakoids to fix carbon dioxide into sugars.
Question 4: What are grana in chloroplasts?
- Single thylakoid discs
- Stacks of thylakoids (Correct answer)
- The space between membranes
- The site of glucose synthesis
Correct answer: Stacks of thylakoids
Grana (singular: granum) are stacks of thylakoids within the chloroplast. This stacked arrangement increases the surface area of the thylakoid membranes, which is crucial for maximizing the efficiency of the light-dependent reactions of photosynthesis.
Question 5: Which part of the chloroplast is responsible for the light-dependent reactions?
- Stroma
- Thylakoid membrane (Correct answer)
- Inner membrane
- Intermembrane space
Correct answer: Thylakoid membrane
The thylakoid membrane is the part of the chloroplast responsible for the light-dependent reactions of photosynthesis. It contains the chlorophyll pigments, photosystems, and electron transport chains that capture light energy, split water, and produce ATP and NADPH.
Free BioInteractive Structure of Chloroplasts Questions and Answers
What is the primary function of chloroplasts in plant cells?