Opening and closing of stomata is controlled by
abscisic acid
CO2 concentration
O2 concentration
light intensity
A.
abscisic acid
B.
CO2 concentration
D.
light intensity
Opening and closing of stomata depends upon the turgidity of guard cells. When the plant has excessive water, the guard cells are turgid and stomata opens. It also depends on CO2 concentration. When CO2 concentration is low is photosynthetic parenchyma, stomata open to absorb more gas. Also as the luminosity increases, the rate of photosynthesis also increases leading to stomatal opening.
ABA or Abscisic Acid is a stress hormone that during water stress conditions induces stomatal closing.
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
Chloroplast dimorphism is a characteristic feature of
plants with Calvin cycle
C4 -plants
all plants
only in algae
In which type of reactions related to plant photosynthesis peroxisomes are involved?
Glycolate cycle
Calvin cycle
Bacterial photosynthesis
Glyoxylate cycle
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
Chlorophyll molecules are located in the
thylakoid membrane
thylakoid lumen
stroma
inner chloroplast membrane
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
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
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
