12th Grade > Biology
PHOTOSYNTHESIS IN HIGHER PLANTS MCQs
Total Questions : 59
| Page 4 of 6 pages
Answer: Option B. -> PS II.
:
B
Since light wavelengths have been categorised into two groups. So the pigments affected by them are also divided into two; i.e., PS-I and PS-II. PS- I comprise p - 680, chlorophyll a - 695, p -700, chlorophyll - b and carotenoids whereas PS - II consists of chlorophyll a - 670, chlorophyll a - 690, chlorophyll b and phycobilin and therefore light is absorbed in PS-I at 700 and in PS-II at or just below 680. If wavelength used is beyond 680 nm PS-II will not function, as this happens in the region of red light, it is called the red drop phenomenon.
:
B
Since light wavelengths have been categorised into two groups. So the pigments affected by them are also divided into two; i.e., PS-I and PS-II. PS- I comprise p - 680, chlorophyll a - 695, p -700, chlorophyll - b and carotenoids whereas PS - II consists of chlorophyll a - 670, chlorophyll a - 690, chlorophyll b and phycobilin and therefore light is absorbed in PS-I at 700 and in PS-II at or just below 680. If wavelength used is beyond 680 nm PS-II will not function, as this happens in the region of red light, it is called the red drop phenomenon.
Answer: Option B. -> Both the reason and assertion are true but the reason is not the correct explanation of the assertion.
:
B
C4 pathway found in tropical angiosperms called as Hatch and Slack cycle. HereCO2 is fixed by 3C compound (phosphoenol pyruvate, (PEP). This pathway reduced photorespiration.
:
B
C4 pathway found in tropical angiosperms called as Hatch and Slack cycle. HereCO2 is fixed by 3C compound (phosphoenol pyruvate, (PEP). This pathway reduced photorespiration.
Answer: Option A. -> True
:
A
This is called as photoexcitation and releases energy during its movement.
:
A
This is called as photoexcitation and releases energy during its movement.
Answer: Option B. -> Mesophyll cells
:
B
In C4plants, the Hatch and Slack pathway involves two carboxylation reaction, one taking place in chloroplast of mesophyll cells and other in chloroplast of bundle – sheath cells. In mesophyll cells, phosphoenol pyruvate (PEP) is carboxylated to oxaloacetate (OAA) which is then reduced to malic acid.
:
B
In C4plants, the Hatch and Slack pathway involves two carboxylation reaction, one taking place in chloroplast of mesophyll cells and other in chloroplast of bundle – sheath cells. In mesophyll cells, phosphoenol pyruvate (PEP) is carboxylated to oxaloacetate (OAA) which is then reduced to malic acid.
Answer: Option D. -> Bundle sheath cells
:
D
Kranz anatomy is a characteristic feature of the leaves of the C4plants like sugarcane, maize, etc. In this type of anatomy, mesophyll cells are not differentiated into spongy and palisade cells and have chloroplasts with large grana. These are involved in the initial fixation of carbon dioxide. Bundle sheath chloroplasts are large and agranal and are highly efficient in carbon dioxide fixation. Here the Calvin cycle takes place andtherefore abundant starch grains are produced.
:
D
Kranz anatomy is a characteristic feature of the leaves of the C4plants like sugarcane, maize, etc. In this type of anatomy, mesophyll cells are not differentiated into spongy and palisade cells and have chloroplasts with large grana. These are involved in the initial fixation of carbon dioxide. Bundle sheath chloroplasts are large and agranal and are highly efficient in carbon dioxide fixation. Here the Calvin cycle takes place andtherefore abundant starch grains are produced.
Answer: Option A. -> light, chemical
:
A
During photosynthesis the energy trapped in light is converted into chemical energy like ATP and glucose.
:
A
During photosynthesis the energy trapped in light is converted into chemical energy like ATP and glucose.
Answer: Option B. -> 3-phosphoglycerate molecules
:
B
Photorespirationoccurs when oxygen interferes with the Kelvin Cycle by causing RuBisCo to fix an O2 to RuBP instead of CO2.
:
B
Photorespirationoccurs when oxygen interferes with the Kelvin Cycle by causing RuBisCo to fix an O2 to RuBP instead of CO2.
Answer: Option B. -> non-cyclic electron pathway
:
B
This is the photlysis of water taking plave during the non0cyclic photophosphorylation.
:
B
This is the photlysis of water taking plave during the non0cyclic photophosphorylation.
Answer: Option C. -> 30
:
C
Glucose is a hexose sugar. It’s one molecule contains six carbon atoms. As Calvin cycle takes in only one carbon (as CO2) at a time, six turns of this cycle will be required to produce one molecule of glucose (6C).
:
C
Glucose is a hexose sugar. It’s one molecule contains six carbon atoms. As Calvin cycle takes in only one carbon (as CO2) at a time, six turns of this cycle will be required to produce one molecule of glucose (6C).
Answer: Option B. -> light-independent
:
B
The energy generated during the light reactions is used to produce NADPH and ATP, which are used in the dark reactions for the fixation of the CO2 to a carbohydrate.
:
B
The energy generated during the light reactions is used to produce NADPH and ATP, which are used in the dark reactions for the fixation of the CO2 to a carbohydrate.
Latest Videos
Latest Test Papers
Login With Google
Old way of Login
Login With Email