238180
During monsoon, the rice crop of eastern states of India shows lesser yield due to limiting factor of
1 $\mathrm{CO}_{2}$
2 light
3 temperature
4 water
Explanation:
B During monsoon, the rice crop of the eastern states of India shows lesser yield due to limiting factor of light. Light quality, light intensity and duration of exposure to light act as factor that affect photosynthesis. During monsoon, the cloudy day condition reduce the light intensity for the plant due to which photosynthetic yield decrease.
AIPMT-1991
Photosynthesis in higher plants
238175
Photosynthesis cannot continue for long if during light reaction, only cyclic-photophosphorylation takes place. This is because
1 There is unidirectional cyclic movement of the electrons
2 There is no evolution of $\mathrm{O}_{2}$
3 Only ATP is formed $\mathrm{NADPH}^{+}+\mathrm{H}^{+}$is not formed
4 Photosystem I stops getting excited of a wavelength of light beyond $680 \mathrm{~nm}$
Explanation:
C Assimilatory power (ATP and $\left.\mathrm{NADPH}_{2}\right)$ are produced during light reaction of photosynthesis. As only cyclic photophosphorylation takes place, only ATP is formed because NADP reductase enzyme is absent in the storma lamellae, so in the cyclic photophosphorylation NADPH \& $\mathrm{O}_{2}$ does not forms. And photosynthesis cannot continue for long. In the absence of $\mathrm{NADPH}_{2}$, the dark reaction of photosynthesis does not takes place.
Karnataka CET-2008
Photosynthesis in higher plants
238179
At a temperature above $35^{\circ} \mathrm{C}$
1 rate of photosynthesis will decline earlier than that of respiration
2 rate of respiration will decline earlier than that of photosynthesis
3 there is no fixed pattern
4 both decline simultaneously
Explanation:
A If the temperature is increased to more than $35^{\circ} \mathrm{C}$ there will be a decline in the rate of photosynthesis due to the denaturation of carbon fixing enzymes. The temperature optimum for photosynthesis of different plants also depends on the habitat that they are adapted to.
AIPMT-1992
Photosynthesis in higher plants
238181
What will happen if the supply of oxygen is decreased to an illuminated wheat plant?
1 Its photosynthesis would decrease
2 Its respiration process would stop
3 All physiological process would stop
4 Its photosynthesis would increase
Explanation:
D Wheat is a $\mathrm{C}_{3}$ plant, where the rate of photosynthesis increases when the amount of oxygen decreases. $\mathrm{C}_{3}$ carbon fixation is one of the metabolic pathway. This process converts $\mathrm{CO}_{2} \& \mathrm{RuBP}$ into 3 phosphoglycerate.
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Photosynthesis in higher plants
238180
During monsoon, the rice crop of eastern states of India shows lesser yield due to limiting factor of
1 $\mathrm{CO}_{2}$
2 light
3 temperature
4 water
Explanation:
B During monsoon, the rice crop of the eastern states of India shows lesser yield due to limiting factor of light. Light quality, light intensity and duration of exposure to light act as factor that affect photosynthesis. During monsoon, the cloudy day condition reduce the light intensity for the plant due to which photosynthetic yield decrease.
AIPMT-1991
Photosynthesis in higher plants
238175
Photosynthesis cannot continue for long if during light reaction, only cyclic-photophosphorylation takes place. This is because
1 There is unidirectional cyclic movement of the electrons
2 There is no evolution of $\mathrm{O}_{2}$
3 Only ATP is formed $\mathrm{NADPH}^{+}+\mathrm{H}^{+}$is not formed
4 Photosystem I stops getting excited of a wavelength of light beyond $680 \mathrm{~nm}$
Explanation:
C Assimilatory power (ATP and $\left.\mathrm{NADPH}_{2}\right)$ are produced during light reaction of photosynthesis. As only cyclic photophosphorylation takes place, only ATP is formed because NADP reductase enzyme is absent in the storma lamellae, so in the cyclic photophosphorylation NADPH \& $\mathrm{O}_{2}$ does not forms. And photosynthesis cannot continue for long. In the absence of $\mathrm{NADPH}_{2}$, the dark reaction of photosynthesis does not takes place.
Karnataka CET-2008
Photosynthesis in higher plants
238179
At a temperature above $35^{\circ} \mathrm{C}$
1 rate of photosynthesis will decline earlier than that of respiration
2 rate of respiration will decline earlier than that of photosynthesis
3 there is no fixed pattern
4 both decline simultaneously
Explanation:
A If the temperature is increased to more than $35^{\circ} \mathrm{C}$ there will be a decline in the rate of photosynthesis due to the denaturation of carbon fixing enzymes. The temperature optimum for photosynthesis of different plants also depends on the habitat that they are adapted to.
AIPMT-1992
Photosynthesis in higher plants
238181
What will happen if the supply of oxygen is decreased to an illuminated wheat plant?
1 Its photosynthesis would decrease
2 Its respiration process would stop
3 All physiological process would stop
4 Its photosynthesis would increase
Explanation:
D Wheat is a $\mathrm{C}_{3}$ plant, where the rate of photosynthesis increases when the amount of oxygen decreases. $\mathrm{C}_{3}$ carbon fixation is one of the metabolic pathway. This process converts $\mathrm{CO}_{2} \& \mathrm{RuBP}$ into 3 phosphoglycerate.
238180
During monsoon, the rice crop of eastern states of India shows lesser yield due to limiting factor of
1 $\mathrm{CO}_{2}$
2 light
3 temperature
4 water
Explanation:
B During monsoon, the rice crop of the eastern states of India shows lesser yield due to limiting factor of light. Light quality, light intensity and duration of exposure to light act as factor that affect photosynthesis. During monsoon, the cloudy day condition reduce the light intensity for the plant due to which photosynthetic yield decrease.
AIPMT-1991
Photosynthesis in higher plants
238175
Photosynthesis cannot continue for long if during light reaction, only cyclic-photophosphorylation takes place. This is because
1 There is unidirectional cyclic movement of the electrons
2 There is no evolution of $\mathrm{O}_{2}$
3 Only ATP is formed $\mathrm{NADPH}^{+}+\mathrm{H}^{+}$is not formed
4 Photosystem I stops getting excited of a wavelength of light beyond $680 \mathrm{~nm}$
Explanation:
C Assimilatory power (ATP and $\left.\mathrm{NADPH}_{2}\right)$ are produced during light reaction of photosynthesis. As only cyclic photophosphorylation takes place, only ATP is formed because NADP reductase enzyme is absent in the storma lamellae, so in the cyclic photophosphorylation NADPH \& $\mathrm{O}_{2}$ does not forms. And photosynthesis cannot continue for long. In the absence of $\mathrm{NADPH}_{2}$, the dark reaction of photosynthesis does not takes place.
Karnataka CET-2008
Photosynthesis in higher plants
238179
At a temperature above $35^{\circ} \mathrm{C}$
1 rate of photosynthesis will decline earlier than that of respiration
2 rate of respiration will decline earlier than that of photosynthesis
3 there is no fixed pattern
4 both decline simultaneously
Explanation:
A If the temperature is increased to more than $35^{\circ} \mathrm{C}$ there will be a decline in the rate of photosynthesis due to the denaturation of carbon fixing enzymes. The temperature optimum for photosynthesis of different plants also depends on the habitat that they are adapted to.
AIPMT-1992
Photosynthesis in higher plants
238181
What will happen if the supply of oxygen is decreased to an illuminated wheat plant?
1 Its photosynthesis would decrease
2 Its respiration process would stop
3 All physiological process would stop
4 Its photosynthesis would increase
Explanation:
D Wheat is a $\mathrm{C}_{3}$ plant, where the rate of photosynthesis increases when the amount of oxygen decreases. $\mathrm{C}_{3}$ carbon fixation is one of the metabolic pathway. This process converts $\mathrm{CO}_{2} \& \mathrm{RuBP}$ into 3 phosphoglycerate.
238180
During monsoon, the rice crop of eastern states of India shows lesser yield due to limiting factor of
1 $\mathrm{CO}_{2}$
2 light
3 temperature
4 water
Explanation:
B During monsoon, the rice crop of the eastern states of India shows lesser yield due to limiting factor of light. Light quality, light intensity and duration of exposure to light act as factor that affect photosynthesis. During monsoon, the cloudy day condition reduce the light intensity for the plant due to which photosynthetic yield decrease.
AIPMT-1991
Photosynthesis in higher plants
238175
Photosynthesis cannot continue for long if during light reaction, only cyclic-photophosphorylation takes place. This is because
1 There is unidirectional cyclic movement of the electrons
2 There is no evolution of $\mathrm{O}_{2}$
3 Only ATP is formed $\mathrm{NADPH}^{+}+\mathrm{H}^{+}$is not formed
4 Photosystem I stops getting excited of a wavelength of light beyond $680 \mathrm{~nm}$
Explanation:
C Assimilatory power (ATP and $\left.\mathrm{NADPH}_{2}\right)$ are produced during light reaction of photosynthesis. As only cyclic photophosphorylation takes place, only ATP is formed because NADP reductase enzyme is absent in the storma lamellae, so in the cyclic photophosphorylation NADPH \& $\mathrm{O}_{2}$ does not forms. And photosynthesis cannot continue for long. In the absence of $\mathrm{NADPH}_{2}$, the dark reaction of photosynthesis does not takes place.
Karnataka CET-2008
Photosynthesis in higher plants
238179
At a temperature above $35^{\circ} \mathrm{C}$
1 rate of photosynthesis will decline earlier than that of respiration
2 rate of respiration will decline earlier than that of photosynthesis
3 there is no fixed pattern
4 both decline simultaneously
Explanation:
A If the temperature is increased to more than $35^{\circ} \mathrm{C}$ there will be a decline in the rate of photosynthesis due to the denaturation of carbon fixing enzymes. The temperature optimum for photosynthesis of different plants also depends on the habitat that they are adapted to.
AIPMT-1992
Photosynthesis in higher plants
238181
What will happen if the supply of oxygen is decreased to an illuminated wheat plant?
1 Its photosynthesis would decrease
2 Its respiration process would stop
3 All physiological process would stop
4 Its photosynthesis would increase
Explanation:
D Wheat is a $\mathrm{C}_{3}$ plant, where the rate of photosynthesis increases when the amount of oxygen decreases. $\mathrm{C}_{3}$ carbon fixation is one of the metabolic pathway. This process converts $\mathrm{CO}_{2} \& \mathrm{RuBP}$ into 3 phosphoglycerate.
