In sugarcane plant14Co2 is fixed in malic acid, in which the enzyme that fixes CO2 is
fructose phosphatase
ribulose biphosphate carboxylase
phosphoenol pyruvic acid carboxylase
ribulose phosphate kinase
Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants?
Violet and blue
Blue and green
Green and red
Red and violet
Stomata of CAM plants
never open
are always open
open during the day and close at night
open during the night and close during the day
Which one of the following is wrong in relation to photorespiration?
It is a characteristic of C3-plants
It occurs in chloroplasts
It occurs in day time only
It is a characteristic of C4-plants
Kranz anatomy is typical of
C4-plants
C3-plants
C2-plants
CAM plants
As compared to a C3-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4-plants
2
6
12
zero
Photorespiration is favoured by
high O2 and low CO2
low light and high O2
low temperature and high O2
low O2 and high CO2
The substrate for photorespiration is
ribulose bis-phosphate
glycolate
serine
glycine
C4-cycle was discovered by
Hatch and Slack
Calvin
Hill
Arnon
Plants adapted to low high intensity have
larger photosynthetic unit size than the sun plants
higher rate of CO2 fixation than the sun plants
more extended root system
leaves modified to spines
