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ICSE Class 10 Plant Physiology — practice questions — page 5

Explore 212 free Plant Physiology questions in ICSE Class 10 Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Plant Physiology questions and exercises with answers

Showing questions 121–150 of 212.

Van Niel described photosynthesis as a light-dependent type of what?Read the answer and worked solution →Emerson’s two-colour experiments supported which idea?Read the answer and worked solution →With red and blue light combined, what happened to output?Read the answer and worked solution →At constant temperature, what happened as irradiance rose in Blackman’s tests?Read the answer and worked solution →Blackman and Matthaei studied light intensity together with which factor?Read the answer and worked solution →Which pigment type absorbs red and blue light in plants?Read the answer and worked solution →Where are chlorophyll molecules arranged in plant cells?Read the answer and worked solution →What is the fluid inside a chloroplast membrane called?Read the answer and worked solution →What powers ATP synthase in the light reactions?Read the answer and worked solution →What happens to a chlorophyll electron after it absorbs a photon?Read the answer and worked solution →Which source ultimately replaces the electron lost by P680 in PSII?Read the answer and worked solution →What does water photolysis release during oxygenic photosynthesis?Read the answer and worked solution →What does cyclic electron flow at photosystem I produce?Read the answer and worked solution →In cyclic electron flow, where does the displaced electron return?Read the answer and worked solution →What is the role of accessory pigments in antenna complexes?Read the answer and worked solution →Which pair names the chlorophyll forms present in green-plant photosystems?Read the answer and worked solution →What do ATP and NADPH do in the Calvin cycle?Read the answer and worked solution →What is the immediate three-carbon product of the Calvin cycle?Read the answer and worked solution →What happens to most G3P molecules made in each Calvin-cycle round?Read the answer and worked solution →Which enzyme captures CO2 in the Calvin cycle?Read the answer and worked solution →Which triose phosphate can later contribute to starch formation?Read the answer and worked solution →How many CO2 molecules yield one net G3P in the Calvin cycle?Read the answer and worked solution →Why is the Calvin cycle not truly a dark reaction?Read the answer and worked solution →At low light, what does warming do to carbon assimilation?Read the answer and worked solution →Under what light condition does warming raise assimilation rate?Read the answer and worked solution →Before another limit, what does more CO2 do to sugar production?Read the answer and worked solution →When CO2 is scarce, what may RuBisCO bind instead?Read the answer and worked solution →What does photorespiration fail to produce while using energy?Read the answer and worked solution →What happens to photorespiration rate at higher temperatures?Read the answer and worked solution →How does shade from nearby plants restrict photosynthesis?Read the answer and worked solution →

Worked practice questions

Van Niel described photosynthesis as a light-dependent type of what?

  1. Electron transport
  2. Redox reaction
  3. Carbon fixation
  4. Energy transfer
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Correct answer: B. Redox reaction

Van Niel described photosynthesis as a light-dependent redox reaction.

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Emerson’s two-colour experiments supported which idea?

  1. One light reaction operates
  2. Pigments work without light
  3. Roots drive photosynthesis
  4. Two light reactions operate
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Correct answer: D. Two light reactions operate

Emerson’s wavelength tests supported two light reactions.

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With red and blue light combined, what happened to output?

  1. Output matched red alone
  2. Output rose substantially
  3. Output stayed near zero
  4. Output fell below red alone
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Correct answer: B. Output rose substantially

The combined red and blue light gave substantially greater output.

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