Photorespiration is favoured by

  • high O2 and low CO2 concentration

  • low O2 and high CO2 concentration

  • low light intensity

  • low temperature.

The C4 plants grow very efficiently in warm climates because they

 

  • consume fewer ATP molecules for glucose synthesis

  • minimize photorepsiratory losses

  • contain enzymes which are not inactivated at high temperatures.

  • have more efficient chloroplasts

Following is needed in the ionic form during non-cyclic photophosphorylation but not during cyclic photophosphorylations in higher plants. 

  • copper

  • iron

  • manganese

  • zinc

Production of NADPH in a chloroplast takes place during

  • cyclic photophosphorylation

  • non-cyclic photophosphorylation

  • series photophosphorylation

  • substrate level photophosphorylation.

The photoautotrophic organisms that do not split water to obtain reducing power are 

  • purple bacteria 

  • cyanobacteria

  • green plants

  • none of these

Dark reaction occurs

  • only in light

  • only in the absence of light

  • independent of light

  • both (1) and (3).

Photorespiration, usually occurs in

  • one cell organelle

  • two cell organelles

  • three cell organelles

  • four cell organelles.

Which of the following statements about phytochrome is true?

  • Pr absorbs yellow light and becomes Pfr 

  • Pr absorbs red light and becomes Pfr 

  • Pfr absorbs red light and becomes Pr 

  • Pfr absorbs yellow light and becomes Pr .

Blackman's law is related to 

  • respiration

  • transpiration

  • root pressure

  • photosynthesis.

Who discovered photophosphorylation?

  • Arnon et. al.

  • Von Mayer

  • Clavin et.al.

  • Hill

Photosynthetic bacteria do not contain

  • quantasome

  • PS-I and PS-II

  • PS-I

  • PS-II.

The photorespiratory carbon-oxidation cycle involves the interaction of

  • chloroplast

  • mitochordria

  • peroxisomes

  • all of these.

Photorespiration in C3 plants starts from:

  • phosphoglycerate

  • phosphoglycolate

  • Glycerate

  • glycine.

Hill reaction occurs in:

  • high altitude plants

  • total darkness

  • absence of water

  • presence of ferricyanide

Which one of the following categories of organisms do not evolve oxygen during photosynthesis?

  • Red algae

  • Photosynthetic bacteria

  • C4 plants with Kranz anatomy

  • Blue green algae

Which of the following is the characteristic of PS-I?

  • It is activate only upto 680 nm of light.

  • The reaction centre of PS-I is P680 . 

  • PS-I is reduced by the electrons released in photolysis of water.

  • PS-I is involved in non-cyclic photophosphorylation.

Cyclic photophosphorylation invloves

  • PS I

  • PS II

  • PS I and PS II

  • P680

The first stable product of Calvin cycle is 

  • 3-phosphoglycerate

  • 1, 3 biphosphoglycerate

  • glyceraldehyde - 3 phosphate

  • ribulose - 5- phosphate

PS-II occurs only in

  • stroma

  • granal thylakoids

  • stromal lamella

  • matrix

Photorespiration shows formation of 

  • sugar but not ATP

  • ATP but not sugar

  • both ATP and sugar

  • neither ATP nor sugar.

Kranz anatomy is usually associated with 

  • C3 plants

  • C4 plants

  • CAM plants

  • C3-C4 intermediate plants.

C4 plants have better productivity because 

 

  • C4 plants absorb more light

  • C4 plants absorb more CO2

  • C4 plants does not carry photorespiration

  • C4 plants have more amount of RuBisCO.

The first carbon dioxide fixation product of C4 plant is 

  • Oxaloacetic acid

  • ribulose biphosphate

  • phosphoenol pyruvate

  • phosphoglyceric acid.

Carbon dioxide is necessary for photosynthesis. The chemical used to remove this gas most effectively from entering a control apparatus is 

  • calcium oxide

  • distilled water

  • potassium hydroxide solution

  • sodium carbonate.

Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because 

  • there is effective pumping of CO2 into bundle sheath cells

  • RuBisCO in C4 plants has higher affinity for CO2

  • six carbon acids are the primary initial CO2 fixation products

  • 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

  • a proton gradient forms across the inner mitochondrial membrane. 

  • There is a change in the permeability of the inner mitochondrial membrane towards adenosine diphosphate (ADP).

  • high energy bonds are formed in mitochondrial proteins

  • ADP is pumped out of the matrix into the intermembrane space.

Which of the following is incorect about the light reactions of photosynthesis?

  • P680 and P700 are the reaction centres of PS-I, and PS-II respectively

  • Light energy provides energy for the photolysis of water through excitation of the reaction centre of PS-II

  • NADPH is not produced in cyclic electrons transport in light reactions

  • 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

  • phycocyanin           

  • cytochrome-c

  • chlorophyll -b         

  •  β-carotene

In Kranz anatomy, the bundle sheath cells have

  • thin walls, many intercellular space and no chloroplast

  • thick walls, no intercellular spaces and large number of chloroplasts

  • thin walls, no intercellular spaces and several chloroplasts

  • thick walls, many intercellular space and few chloroplasts

The C4 plants differ from C3 plants with reference to the 

  • substrate that accepts CO2 in carbon assimilation

  • type of end product

  • type of pigment involved in photosynthesis

  •   end product that will be formed 

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