In sugarcane plant, 14CO2 is fixed in a malic acid, in which the enzyme that fixes CO2 is
ribulose phosphate kinase
fructose phosphatase
ribulose biphosphate carboxylase
phosphoenol pyruvic acid carboxylase
Which one of the following is wrong in relation to photorespiration?
It is a characteristic of C4 -plants
It is a characteristic of C3 -plants
It occurs in chloroplasts
It occurs in daytime only
A.
It is a characteristic of C4 -plants
Dicker and Tio (1959) discovered photorespiration in tobacco plant. It is a light dependent process of oxygenation of ribulose bis phosphate (RuBP). During this process, carbon dioxide is liberated and oxygen is consumed. C4 -plants avoid photorespiration by following Hatch Slack Pathway.
Stomata of CAM plants
open during the night and close during the day
never open
are always open
open during the day and close at night
Which one of the following is categorised under living fossils?
Selaginella
Metasequoia
Pinus
Cycas
Chlorenchyma is known to develop in the
spore capsule of a moss
pollen tube of Pinus
cytoplasm of Chlorella
mycellium of a green mould such as Aspergillus
Boron in green plants assists in
photosynthesis
sugar transport
activation of enzymes
acting as enzyme cofactor
Barr-body in mammals represents
one of the two X-chromosomes in the cells
all heterochromatin of male and female cells
Y-chromosome of male
all heterochromatin of female cells
Discontinuous variations are
essential features
acquired character
non-essential changes
heritable changes