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CBSE Class 11 · Biology

Photosynthesis in Higher Plants

Official NCERT chapter from Biology (book code kebo1). ExamMaster notes are original teaching at CBSE Class 11 depth.

This lesson follows the official chapter “Photosynthesis in Higher Plants” in Biology. The words below are ExamMaster’s teaching, not a paste from the book. Use the NCERT chapter for the classroom sequence; use these notes to hold the idea without copying exercises or figures.

  • CBSE Class 11
  • Medium level
  • 8 concepts

1What do we Know?

What we know (school): green plants make food using light, carbon dioxide, and water as taught; oxygen is the leftover look. “What we know” is that job-sentence, not a slogan. One leaf is enough as the site-hint.

A night-only “plants eat soil” as the whole know is a miss.

Figure. What we already know is a job, not a word list: the leaf uses light to join carbon dioxide and water into sugar and free oxygen. If that job stops, the plant cannot make its own food.

How it works

  1. Name light + CO2 + water → food (+ O2 as taught)What we know.
  2. Keep it a leaf-jobThe site-hint.
  3. Refuse soil-eat as the food-makeA light-job.

2Early Experiments

Early experiments: a named look that forced the gas-and-light story (Priestley, Ingenhousz, or the lesson’s names). An experiment is a look-plus-claim, not a biography. One candle-and-mint or a light-split is enough.

A name-list with no look is a mute history.

Figure. Priestley’s school test is a pair of closed jars. A candle in stale air goes out; the same candle stays lit when a green shoot shares the jar. The plant’s job is to restore the air the flame uses.

How it works

  1. Name the look (gas, light, a plant)The experiment.
  2. Say what claim it forcedWhy it sits here.
  3. Keep the biography shortA look-story.

3Where does Photosynthesis take place?

Where: chloroplasts in green mesophyll as taught; thylakoid versus stroma if split. “Where” is an organelle-address, not “the garden”. A root-tip as the site is a miss unless the lesson had a green exception.

A mitochondrion as the photosynthesis-room is a steal.

Figure. Photosynthesis has an address: the chloroplast. Light work sits on the thylakoid membranes; sugar is built in the stroma around them. A labelled part with no job is only a glossary.

How it works

  1. Name chloroplast (and the tissue if asked)Where.
  2. Split thylakoid / stroma if taughtThe inner address.
  3. Refuse a root as the default siteA green-room.

4How many Types of Pigments are Involved?

Pigments: chlorophyll a as the main school pigment; chlorophyll b and carotenoids as accessories if taught. A pigment is a light-catcher, not a paint. One absorption-hint is enough.

Calling anthocyanin the food-make pigment because it is colourful is a miss.

Figure. A leaf extract is one green smear until a solvent pulls the pigments apart. Four bands on one strip are four pigments: carotenoid travels farthest, then xanthophyll, chlorophyll a, and chlorophyll b nearest the origin. Heights are a school order, not a measured Rf table.

How it works

  1. Name chlorophyll a as the main catcherThe pigment.
  2. Add accessories only as taughtThe extras.
  3. Refuse a flower-colour as this headingA catch-word.

5What is Light Reaction?

Light reaction: light-driven electron flow in thylakoids as taught; ATP and NADPH made, O2 released from water if framed. Light reaction is the light-half, not the sugar-write. Photolysis of water as the O2 source if named.

A stroma sugar-cycle labelled “light reaction” is a half-swap.

Figure. The light reaction is the thylakoid’s job: water is split, oxygen leaves, and the membrane stores the gain as ATP and NADPH. No light means those two carriers are not made.

How it works

  1. Name thylakoid + light + ATP/NADPH (+ O2)The light half.
  2. Keep sugar-making for the next uses-headingTwo halves.
  3. Refuse a dark-room as this headingNeeds light.

6The Electron Transport

Electron transport (school): a chain from water to NADP as taught, via named photosystems if listed. Transport is a pass-along, not a second pigment-list. One chain-arrow is enough.

A food-pipe (phloem) as this electron chain is a word-swap.

Figure. Electrons rise in energy at each photosystem, then fall through the carriers between them — a Z in energy, not a map of the membrane. Heights are qualitative and not to scale.

How it works

  1. Name the pass from water toward NADP as taughtThe transport.
  2. Keep photosystems only if listedThe extras.
  3. Refuse a phloem-pipe hereElectrons, not sugar-tubes.

7Where are the ATP and NADPH Used?

Where ATP and NADPH are used: the stroma Calvin cycle as taught — CO2 to sugar. The uses-heading is the carbon-half. Rubisco or C3 as names if the lesson used them. Light-products fuel the dark-looking half that still needs those products.

Dumping ATP in the soil as “use” is a miss.

Figure. ATP and NADPH made on the thylakoid are spent in the stroma: carbon dioxide is fixed to RuBP, PGA is reduced toward sugar, and a dashed return rebuilds RuBP. If those two carriers are missing, the Calvin sequence stops.

How it works

  1. Name stroma + CO2 → sugarThe use.
  2. Keep ATP and NADPH as the fuel from the light halfThe link.
  3. Refuse a thylakoid as the sugar-roomStroma.

8The C4 Pathway

The C4 pathway (school): a spatial split that concentrates CO2 as taught — mesophyll then bundle-sheath. C4 is a named extra path, not “better plants” as a slogan. Maize or a named C4 if the lesson used one. Keep C3 as the default Calvin if asked.

Calling every crop C4 is a steal.

Figure. C4 is a two-room job. Mesophyll first traps carbon dioxide as a four-carbon acid; the bundle sheath then frees that carbon dioxide onto the Calvin sequence. One room cannot stand in for the other.

How it works

  1. Name the two-tissue split as taughtC4.
  2. Keep it a CO2-concentrate storyThe why.
  3. Refuse a slogan as the testA path-word.
The light reaction’s school products include
  1. ATP and NADPH (and O2 as taught)
  2. Glucose in the thylakoid as the first write
  3. Ash

Light-half products.

Notes

  • Mapped to the official NCERT chapter “Photosynthesis in Higher Plants”. Original teaching only — no textbook sentences.
  • Science here is Physics, Chemistry and Biology ideas at this class, never a language or social-science chapter.

Recap

Hold these pegs from the official chapter “Photosynthesis in Higher Plants”. The wording is ExamMaster’s teaching, not a textbook recap.

What do we Know?
What we know (school): green plants make food using light, carbon dioxide, and water as taught; oxygen is the leftover look.
Early Experiments
Early experiments: a named look that forced the gas-and-light story (Priestley, Ingenhousz, or the lesson’s names).
Where does Photosynthesis take place?
Where: chloroplasts in green mesophyll as taught; thylakoid versus stroma if split.
How many Types of Pigments are Involved?
Pigments: chlorophyll a as the main school pigment; chlorophyll b and carotenoids as accessories if taught.
What is Light Reaction?
Light reaction: light-driven electron flow in thylakoids as taught; ATP and NADPH made, O2 released from water if framed.
The Electron Transport
Electron transport (school): a chain from water to NADP as taught, via named photosystems if listed.

Practise Photosynthesis in Higher Plants

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