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
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 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.
Photorespiration usually occurs in
one cell organelle
two cell organelles
three cell organelles
four cell organelles
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.
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.
The photorespiratory carbon-oxidation cycle involves the interaction of
all of these