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

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.

Photosynthetic bacteria do not contain

• quantasome

• PS- I and PS- II

• PS-II

• PS-I

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 : Among the land animals, the Cheetah can run fastest over the ground.

Reason : The Cheetah uses its powerful forelimbs to push itself forward during running. 

• 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 : Wounds heal slowly due to vitamin C deficiency.

Reason : Vitamin C is essential for collagen formation

• 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.

39.

Assertion : A plant girdled upto bast will die.

Reason : Food transportation in such plant will cease followed by ceasation of water transport.

• 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 : Phenylketonuria is a disease in which excretion of phenylalanine occurs in urine. 

Reason : It is due to dietary imbalance.

• 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