Sugarcane show high efficiency of CO₂ fixation because of :

• Calvin cycle

• Hatch and Slack cycle

• TCA cycle

• greater sunlight

Photosynthetic unit is :

• glyoxysome

• spherosome

• microsome

• quantasome

The photorespiratory carbon-oxidation cycle involves the interaction of

• chloroplast

• mitochondria

• peroxisomes

• all of these

Assertion : The collenchyma is a thick walled living tissue.

Reason : The collenchyma is thickened due to the deposition of pectin.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both the assertion and reason are false.

Assertion : When six molecules ofcarbon dioxide participate in photosynthesis, 12 molecules of NADP and 18 ATP are used up, forming one hexose molecule. 

Reason : The photosynthetic light reaction results in the formation of ATP and NADPH.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false.

• If both the assertion and reason are false.

276.

Photorespiration usually occurs in

• one cell organelle

• two cell organelles

• three cell organelles

• four cell organelles

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

Which of the following statements about phytochrome is true?

• P_r absorbs yellow light and becomes P_fr

• P_r absorbs red light and becomes P_fr

• P_fr absorbs red light and becomes P_r

• P_fr absorbs yellow light and becomes P_r

Blackman's law is related to

• respiration

• transpiration

• root pressure

• photosynthesis

Who discovered photophosphorylation?

• Arnon et. al.

• Von Mayer

• Calvin et. al.

• Hill