Here are the correct answers for the questions shown in your worksheet, along with a brief explanation for each to help you understand why they are correct.
1. The stacks of flattened sacs in the picture are called
*
Reasoning: Inside a chloroplast, there are individual flattened sacs called *thylakoids*. When these thylakoids stack on top of each other like pancakes, that specific stack is called a *granum* (plural: *grana*). Chlorophyll is the pigment inside them, and stroma is the fluid surrounding them.
*
Correct Option: D) grana
2. In which eukaryotic organelles does photosynthesis occur?
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Reasoning: Photosynthesis is the process plants use to make food using sunlight. This process happens exclusively inside the
chloroplasts. Mitochondria are for cellular respiration (making energy from food), stomata are holes in leaves for gas exchange, and xylem transports water.
*
Correct Option: D) chloroplast
3. Most plants appear green because chlorophyll
*
Reasoning: We see objects as the color of the light they reflect. Chlorophyll absorbs red and blue/violet light very well to use for energy, but it does *not* absorb green light well. Instead, it reflects green light back to our eyes, which is why plants look green.
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Correct Option: B) reflects green light.
4. Where do the light-dependent reactions occur?
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Reasoning: The light-dependent reactions require sunlight and pigments (like chlorophyll) to capture that energy. These pigments are embedded in the membranes of the thylakoids. Therefore, this stage happens in the
thylakoid membrane. The Calvin Cycle (light-independent) happens in the stroma.
*
Correct Option: B) thylakoid membrane
5. What is the primary function of the light-dependent reactions of photosynthesis?
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Reasoning: During the first stage of photosynthesis, sunlight splits water molecules. The energy from the sun is captured and stored in two chemical "batteries":
ATP and
NADPH. These batteries are then used in the next stage to build glucose. Glucose itself is made in the second stage (Calvin Cycle).
*
Correct Option: C) To produce NADPH and ATP
6. Which of the following is NOT a product of the light-dependent reactions?
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Reasoning: The light-dependent reactions produce Oxygen (as a waste product from splitting water), ATP, and NADPH.
Glucose is the final product of the *second* stage of photosynthesis (the Calvin Cycle), not the light-dependent reactions.
*
Correct Option: B) Glucose
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Final Answer:
1. D
2. D
3. B
4. B
5. C
6. B
Parent Tip: Review the logic above to help your child master the concept of high school biology worksheet pdf.
