C4 plants have better productivity because
(1) C4 plants absorb more light
(2) C4 plants absorb more CO2
(3) C4 plants does not carry photorespiration
(4) C4 plants have more amount of RuBisCO.
The first carbon dioxide fixation product of C4 plant is
(1) Oxaloacetic acid
(2) ribulose biphosphate
(3) phosphoenol pyruvate
(4) phosphoglyceric acid.
Carbon dioxide is necessary for photosynthesis. The chemical used to remove this gas most effectively from entering a control apparatus is
(1) calcium oxide
(2) distilled water
(3) potassium hydroxide solution
(4) sodium carbonate.
Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because
(1) there is effective pumping of CO2 into bundle sheath cells
(2) RuBisCO in C4 plants has higher affinity for CO2
(3) six carbon acids are the primary initial CO2 fixation products
(4) the primary fixation of CO2 is mediated via PEP carboxylase.
The chemiosmotic coupling hypotheisis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because
(1) a proton gradient forms across the inner mitochondrial membrane.
(2) There is a change in the permeability of the inner mitochondrial membrane towards adenosine diphosphate (ADP).
(3) high energy bonds are formed in mitochondrial proteins
(4) ADP is pumped out of the matrix into the intermembrane space.
Which of the following is incorect about the light reactions of photosynthesis?
(1) P680 and P700 are the reaction centres of PS-I, and PS-II respectively
(2) Light energy provides energy for the photolysis of water through excitation of the reaction centre of PS-II
(3) NADPH is not produced in cyclic electrons transport in light reactions
(4) Reactions of the two photosystems are needed for the reduction of NADP
In blue-green algae, photosystem- II contains important pigment concerned with photolysis of water. It is a
(a) phycocyanin (b) cytochrome-c
(c) chlorophyll - (d) -carotene
Which one of the following organisms is correctly matched with its three characterstics?
(1) Pea- C3 -pathway, endospermic seed, vexillary aestivation
(2) Tomato- twisted aestivation, axile placentation, berry
(3) Onion- Bulb, imbricate aestivation, axile placentation
(4) Maize- C3 -pathway, closed vascular bundle, scutellum
In Kranz anatomy, the bundle sheath cells have
(1) thin walls, many intercellular space and no chloroplast
(2) thick walls, no intercellular spaces and large number of chloroplasts
(3) thin walls, no intercellular spaces and several chloroplasts
(4) thick walls, many intercellular space and few chloroplasts
The C4 plants differ from C3 plants with reference to the
(1) substrate that accepts CO2 in carbon assimilation
(2) type of end product
(3) type of pigment involved in photosynthesis
(4) end product that will be formed