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
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
A.
quantasome
Photosynthetic bacteria are of two types- Oxygenic and Anoxygenic. They do not have chloroplast, and photosynthesis takes place within the cell. In cyanobacteria, thylakoids lie naked in the cytoplasm and attached to them are minute structures called phycobilisomes which contain the pigments. Bacteria have only one photosystem i.e. type I reaction centre (PS I- 700) in green sulphur bacteria and type II (PS II- 680) in non sulphur bacteria.
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.
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