C4 pathway is advantageous over C3 pathway in plants as it
occurs in relatively low CO2 concentration
uses more amount of water
occurs in relatively low O2 concentration
is less efficient in energy utilisation
A.
occurs in relatively low CO2 concentration
Plants with the C4 pathway has many advantages over a plant with a C3 pathway. When the weather is hot, acid, dry, the leaves close their stomata to eliminate water less whereas in C3 plants this closure results in low carbon dioxide concentrations and ultimately both loss of RuBP and inhibition of the Calvin-Benson cycle by photorespiration.
There are no such disadvantages in a C4 plant during hot, dry weather. Even with its stomata are closed, carbon dioxide is fixed because of the efficiency of REP carboxylase in trapping and concentrating carbon dioxide. Consequently, the Calvin-Benson cycle continues to produce glucose and there is no loss of chemical energy through photorespiration.
Identify the correct statements in relation to C4 photosynthesis.
Kranz anatomy is an essential feature for C4 plants
C4 plants have higher water use efficiency than C3 plants
Photorespiration can be minimised when C3 pathway is in operation
Conversion of oxaloacetate to malate occurs in the bundle sheath cells
The correct sequence of organelles in which glycolate and glyoxylate are produced sequentially in photorespiration is
chloroplast and mitochondria
chloroplast and peroxisome
peroxisome and mitochondria
peroxisome and chloroplast
Opening and closing of stomata is controlled by
abscisic acid
CO2 concentration
O2 concentration
light intensity
Chlorophyll molecules are located in the
thylakoid membrane
thylakoid lumen
stroma
inner chloroplast membrane
Identify the membrane across which the proton (H+) gradient facilitates ATP synthesis in a typical eukaryotic cell
plasma membrane
mitochondrial inner membrane
mitochondrial outer membrane
nuclear membrane
Chloroplast dimorphism is a characteristic feature of
plants with Calvin cycle
C4 -plants
all plants
only in algae
In a CAM plant, the concentration of organic acid
increases during the day
decreases or increases during the day
increases during night
decreases during any time
In which type of reactions related to plant photosynthesis peroxisomes are involved?
Glycolate cycle
Calvin cycle
Bacterial photosynthesis
Glyoxylate cycle
