Which of the following cell organelles is associated with photorespiration?
Mitochondria
Peroxysome
Chloroplast
All of these
B.
Peroxysome
Photorespiration (C2-cycle) is a special type of respiration shown by many green plants (C3-plants) when they are exposed to light. It is a light-dependent process during, which O2 is used and CO2 is released. The process of photorespiration takes place only in chlorophyllous tissues of plants. Therefore, the main site for photorespiration is chloroplast. But mitochondria and peroxysomes are also required to complete the process.
Light reaction in stroma lamellae of the chloroplast results in the formation of
NADPH
ATP + NADPH
ATP K
O2
Which of the following plant keeps its stomata open during night and closed during the day?
Orchid
Cactus
Tea
Wheat
In which one of the following, the male and female gametophytes don’t have free-living independent existence?
Pteris
Funaria
Polytrichum
Cedrus
Which one of the following elements is an activator for both ribulose biphosphate, carboxylase oxygenase and phosphoenol-pyruvate carboxylase in photosynthetic carbon fixation?
Mg2+
Zn2+
Mn2+
Cl− and K+
The net requirement of assimilatory power for the formation of 6 hexose molecules in maize plant is
72 ATP, 48 NADPH
90 ATP, 60 NADPH
108 ATP, 72 NADPH
180 ATP, 72 NADPH
Which of the following characteristics is are exhibited by C4 -plants?
I. Kranz anatomy.
II. The first product of photosynthesis is oxaloacetic acid.
III. Both PEP carboxylates and ribulose biphosphate carboxylate act as carboxylating enzymes.
The correct option is
I and III, but not ll
I and II, but not III
II and III, but not I
ll and III
Which of the following characteristics out of I, II and III are exhibited by C4 plants?
I. Kranz anatomy.
II. The product of photosynthesis is oxalo acetic acid.
III. Both PEP carboxylase and ribulose-bis phosphate carboxylase act as carboxylating enzyme.
Choose the correct option.
I and II, but not III
II and III, but not I
I and III, but not II
All of these
