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Veda Bites are swipeable micro-lessons — each one teaches exactly one idea. The bites below come from this kit — swipe through them in the app.
Sunlight becomes your food. Literally.
Photosynthesis is the process where green plants use light energy to convert carbon dioxide and water into glucose and oxygen.
↳ Photosynthesis stores solar energy as chemical energy in glucose — the base of almost every food chain.
Four words unlock the whole chapter.
↳ Chlorophyll traps light; chloroplasts host the reaction; stomata let gases in and out.
From sunlight to sugar in four moves.
The overall reaction needs light, chlorophyll, CO₂, and water — remove any one and photosynthesis stops.
↳ Light splits water, CO₂ is fixed into glucose, and oxygen is released.
The leaf is a solar-powered factory.
↳ Leaves are built for photosynthesis: chloroplasts capture light, stomata handle gases, veins supply water.
Every breath you take starts here.
↳ No photosynthesis = no oxygen, no food, no life as we know it.
Soil isn't food. It's raw material.
↳ Soil provides water and minerals; food is made in the leaves using sunlight.
Opposite reactions, same planet.
↳ Photosynthesis stores energy; respiration releases it — they are complementary, not the same.
One equation, many marks.
↳ Write the equation with light and chlorophyll above the arrow to score full marks.
Three letters, one reaction.
↳ CLW — Carbon dioxide, Light, Water — are the three inputs plants need.
Plants don't make oxygen for us.
Oxygen is released as a waste product of photosynthesis — plants don't make it on purpose. The oxygen comes from splitting water molecules, not from carbon dioxide.
↳ The oxygen we breathe is a leftover from water being split during photosynthesis.
Control the inputs, boost the output.
↳ Greenhouses work because they optimise the conditions photosynthesis needs.
One is the pigment, one is the room.
↳ Chloroplast = the site; chlorophyll = the pigment inside it.
Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose. Using carbon dioxide, water, and sunlight, they produce glucose and release oxyge…
Full explanation, worked examples & memory tricks in the app
All 18 questions, laddered from warm-up to topper-level, each with its answer and the reasoning behind it.
Q1. Which of the following best defines photosynthesis?
BeginnerD · The process by which green plants make their own food using carbon dioxide, water and sunlight.
Photosynthesis is how green plants make their own food using carbon dioxide, water and sunlight, releasing oxygen. Absorbing minerals is not photosynthesis, releasing energy from glucose is respiration, and losing water vapour is transpiration.
Q2. Which pigment absorbs light energy during photosynthesis?
BeginnerB · Chlorophyll
Chlorophyll is the green pigment in chloroplasts that absorbs light energy. Starch and glucose are products, and iodine is used in the starch test.
Q3. Through which structures does carbon dioxide enter a leaf?
BeginnerB · Stomata
Carbon dioxide diffuses into the leaf through the stomata, which are tiny pores mostly on the lower surface. Roots absorb water, the petiole holds the leaf to the stem, and xylem transports water.
Q4. A student says, 'Plants get their food from the soil through their roots.' What is wrong with this statement?
BeginnerC · Roots absorb water and minerals, not food; the plant makes its own food in the leaves.
Roots absorb water and dissolved minerals, not food. The plant makes its own food through photosynthesis in the leaves. This is one of the most commonly tested misconceptions.
Q5. Which of the following is the correct word equation for photosynthesis?
BeginnerA · Carbon dioxide + water → glucose + oxygen
Photosynthesis uses carbon dioxide and water to make glucose and oxygen in the presence of sunlight and chlorophyll. The reverse equation describes respiration.
Q6. Photosynthesis converts light energy into chemical energy stored in glucose, using carbon dioxide and water, and releases oxygen.
BeginnerA · True
Photosynthesis converts light energy into chemical energy stored in glucose, using carbon dioxide and water, and releases oxygen.
Q7. A potted plant is placed in a dark cupboard for three days. What will happen to its rate of photosynthesis?
IntermediateA · It will stop because there is no light energy to absorb.
Photosynthesis mainly occurs in light. Without light, chlorophyll cannot capture light energy, so the process stops. Water alone cannot drive photosynthesis without light.
Q8. Why do leaves look green to us?
IntermediateB · Chlorophyll reflects green light and absorbs blue and red light.
Chlorophyll absorbs mainly blue and red light and reflects green light, which is why leaves appear green. The other options reverse the absorption or invent a cause.
Q9. Which of the following is NOT a factor that affects the rate of photosynthesis?
IntermediateA · The colour of the flower on the plant
Light intensity, CO₂ concentration, temperature, water availability and chlorophyll all affect photosynthesis. The colour of the flower is unrelated to the rate of photosynthesis in the leaves.
Q10. A leaf from a plant kept in sunlight is tested with iodine and turns blue-black. What does this show?
IntermediateA · Starch is present, so photosynthesis has occurred.
Iodine turns blue-black in the presence of starch. Since glucose made in photosynthesis is stored as starch, a blue-black result confirms photosynthesis occurred.
Q11. Why does a variegated leaf with white patches photosynthesise less than an all-green leaf?
IntermediateA · The white patches lack chlorophyll, so they cannot trap light energy.
White patches contain no chlorophyll, so they cannot absorb light energy for photosynthesis. The green areas photosynthesise normally, but the white areas do not.
Q12. Which statement correctly compares photosynthesis and respiration?
IntermediateC · Photosynthesis mainly occurs in light, while respiration occurs all the time.
Photosynthesis mainly occurs in light and takes in CO₂ while releasing O₂. Respiration occurs all the time in all living cells, taking in O₂ and releasing CO₂.
Q13. An underwater plant in bright sunlight is giving off bubbles. What are these bubbles?
IntermediateB · Oxygen released during photosynthesis
The bubbles are oxygen, which is released as a by-product when the plant photosynthesises in sunlight. Glucose is not a gas and stays in the plant.
Q14. Assertion (A): A plant with dry soil cannot photosynthesise efficiently even in full sunlight. Reason (R): Water is a raw material for photosynthesis and is absorbed by the roots.
AdvancedA · Both A and R are true, and R correctly explains A.
Water is one of the three raw materials for photosynthesis, absorbed by the roots. If the soil is dry, water supply is limited, so photosynthesis slows down even when light is plentiful. R directly explains A.
Q15. A greenhouse grower wants to increase crop yield. Which combination of changes would most directly boost photosynthesis?
AdvancedC · Increase light, raise CO₂ concentration and maintain a suitable temperature
Photosynthesis is limited by light intensity, CO₂ concentration and temperature. Increasing these within suitable ranges raises the rate and improves yield. Blocking stomata or removing chlorophyll would reduce photosynthesis.
Q16. Statement I: Photosynthesis stores light energy as chemical energy in glucose. Statement II: Respiration releases the energy stored in glucose. Statement III: Photosynthesis and respiration are complementary processes.
AdvancedD · I, II and III are all correct.
Photosynthesis converts light energy into chemical energy stored in glucose (I). Respiration releases that stored energy (II). Together they form a complementary pair — photosynthesis makes food and oxygen that respiration uses (III).
Q17. A plant in a sunny environment is not growing well. After investigation, it is found that the stomata are blocked. Analyze the impact of this condition on the photosynthesis process and identify the primary reason for the plant's poor growth.
AdvancedC · The plant cannot take in carbon dioxide, which is essential for glucose synthesis.
The correct option is B. Stomata are responsible for the exchange of gases; if they are blocked, carbon dioxide cannot enter the leaf, halting the photosynthesis process and preventing glucose production, which is vital for the plant's growth.
Q18. Consider a leaf that has been exposed to sunlight and is then subjected to a starch test. If the leaf turns blue-black, what can be inferred about the conditions necessary for photosynthesis to occur, and what does this imply about the leaf's chlorophyll content?
AdvancedC · Photosynthesis occurred due to sufficient light and chlorophyll, indicating healthy leaf function.
The correct option is A. The blue-black color from the starch test indicates that photosynthesis occurred, which requires both sufficient light and chlorophyll. This implies that the leaf is functioning well and is healthy.
25 flashcards in this kit — the app reviews them with spaced repetition so the right card returns on the right day.
Every game is built from this kit's own content — scores feed your mastery, so playing counts as studying.
Word Match
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True False
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Memory Match
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Flashcard Battle
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Speed Quiz
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Guess Term
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Sequence Builder
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Categorization
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Revision Battle
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