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 Multiple Choice QuestionsMultiple Choice Questions

171.

Photorespiration usually occurs in

  • one cell organelle

  • two cell organelles

  • three cell organelles

  • four cell organelles


172.

Stomata opens

  • in day time - for gaseous exchange

  • in day time- no gaseous exchange

  • in night time only - for gaseous exchange

  • in night time only - no gaseous exchange


173.

Which of the following statements about phytochrome is true?

  • Pr absorbs yellow light and becomes Pfr

  • Pr absorbs red light and becomes Pfr

  • Pfr absorbs red light and becomes Pr

  • Pfr absorbs yellow light and becomes Pr


174.

Blackman's law is related to

  • respiration

  • transpiration

  • root pressure

  • photosynthesis


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175.

Who discovered photophosphorylation?

  • Arnon et. al.

  • Von Mayer

  • Calvin et. al.

  • Hill


176.

Which of the following statements is correct regarding short day plants (SDPs)?

  • They can flower in complete darkness if supplied with exogenous nutrients.

  • They are the same as long day plants.

  • They do not have a critical photoperiod

  • All of these.


177.

Photosynthetic bacteria do not contain

  • quantasome

  • PS- I and PS- II

  • PS-II

  • PS-I


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178.

Assertion : Stomata remain open during day.

Reason : Stomata help in exchange of gases.

  • If both Assertion and Reason are true and Reason is the correct explantion of Assertion

  • If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If Assertion is false but Reason is true.


B.

If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

The opening and closing of stomata is a function of turgor changes in guard cells.

In light,  malic acid is produced in guard cells which dissociates into hydrogen and malate ions resulting in intake of  K+ ions through H+ - K+ ion exchange. There is increase in concentration of K+ and malate ions in guard cells, endosmosis of water into guard cells occurs resulting in increased turgor pressure which results in stomatal opening. These are concerned with gaseous exchange during photosynthesis and respiration and water loss through transpiration.


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179.

Which of the following statements regarding cyclic flow of electrons during light reactions is false?

  • This process takes place in the stromal lamella

  • ATP synthesis takes place

  • NADPH + H+ is synthesized

  • Takes place only when light of wavelength beyond 680 nm is available for excitation

  • Takes place only when light of wavelength beyond 680 nm is available for excitation


180.

Find out the mismatched pair

  • C4 plants - Kranz anatomy

  • Primary CO2 fixation product of C4 plants - OAA

  • Primary CO2 acceptor of C3  plants - RuBP

  • Calvin pathway of C4 plants occur in  - Bundle sheath 

  • Calvin pathway of C4 plants occur in  - Bundle sheath 


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