Chapter: Photosynthesis

One scientist cultured Cladophora in a suspension of Azotobacter and illuminated the culture by splitting light through a prism. He observed that bacteria accumulated mainly in the region of

In a chloroplast the highest number of protons are found in

Of the total incident solar radiation the proportion of PAR is

Stroma in the chloroplasts of higher plants contains

Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starch (A–E) make it useful as a storage material?
A. easily translocated
B. chemically non-reactive
C. easily digested by animals
D. osmotically inactive
E. synthesised during photosynthesis
The useful properties are

Chlorophyll in chloroplasts is located in

Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants?

Which element is located at the centre of the porphyrin ring in chlorophyll?

Stomata of CAM plants

The first step of photosynthesis is

Chlorophyll-a molecule at its carbon atom 3 of the pyrrole ring-II has one of the following

Pigment acting as a reaction centre during photosynthesis is

Nine-tenth of all photosynthesis of world (85-90%) is carried out by

Maximum solar energy is trapped by

Chlorophyll-a occurs in

Photosynthetic pigments found in the chloroplasts occur in

The size of chlorophyll molecule is

Which of the following statement is incorrect?

In light reaction, plastoquinone facilitates the transfer of electrons from

Which of the following is not a product of light reaction of photosynthesis?

In photosynthesis, the light-independent reactions take place at

Anoxygenic photosynthesis is characteristic of

A process that makes important difference between C₃ and C₄ -plants is

Oxygenic photosynthesis occurs in

Cyclic-photophosphorylation results in the formation of

The first acceptor of electrons from an excited chlorophyll molecule of photosystem-II is

In photosystem-I the first electron acceptor is

Which of the following absorb light energy for photosynthesis?

Which pigment system is inactivated in red drop?

Photochemical reactions in the chloroplast are directly involved in

Protochlorophyll differs from chlorophyll in lacking

NADPH is generated through

Which one occurs both during cyclic and non-cyclic modes of photophosphorylation?

Formation of ATP in photosynthesis and respiration is an oxidation process which utilises the energy from

Photosystem-II occurs in

Ferredoxin is a constituent of

NADP ⁺ is reduced to NADPH in

The first stable product of CO₂ fixation in Sorghum is

Which of the following statements is incorrect?

The oxygenation activity of RuBisCO enzyme in photorespiration leads to the formation of

In Hatch and Slack pathway, the primary CO₂ acceptor is

Phosphoenol Pyruvate (PEP) is the primary CO₂ acceptor in

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant?

PGA as the first CO₂ -fixation product was discovered in photosynthesis of

C₄ -plants are more efficient in photosynthesis than C₃ -plants due to

In the leaves of C₄ -plants, malic acid formation during CO₂ -fixation occurs in the cells of

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

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

In C₃-plants, the first stable product of photosynthesis during the dark reaction is

In sugarcane plant 14 CO₂ is fixed in malic acid, in which the enzyme that fixes CO₂ is

In photosynthesis energy from light reaction to dark reaction is transferred in the form of

Which pair is wrong?

How many turns of Calvin cycle yield one molecule of glucose?

Fixation of one CO₂ molecule through Calvin cycle requires

Which one of the following is represented by Calvin cycle?

C₄ -cycle was discovered by

The carbon dioxide acceptor in Calvin cycle/ C₃ -plants is

Which one is a C₄ -plant?

The enzyme that catalyses initial carbon dioxide fixation in C₂ -plants is

Dark reactions of photosynthesis occur in

Which technique has helped in investigation of Calvin cycle?

Kranz anatomy is typical of

The first carbon dioxide acceptor in C₄ -plants is

In C 4 -plants, Calvin cycle operates in

A very efficient converter of solar energy with net productivity of 2-4 kg/m² or more is the crop of

Carbon dioxide joins the photosynthetic pathway in

During non-cyclic photophosphorylation, when electrons are lost from the reaction centre at PS-II, what is the source which replaces these electrons?

The process which makes major difference between C₃ and C₄ -plants is

The correct sequence of cell organelles during photorespiration is

During photorespiration, the oxygen consuming reaction(s) occur in

Which one of the following is wrong in relation to photorespiration?

Which enzyme is most abundantly found on earth?

Photorespiration is favoured by

The substrate for photorespiration is

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

Emerson’s enhancement effect and red drop have been instrumental in the discovery of

The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of element involved in this reaction?

Plants adapted to low light intensity have

The principle of limiting factors was proposed by

Photosynthetically active radiation is represented by the range of wavelength

A photosynthesising plant is releasing ¹⁸O more than the normal. The plant must have been supplied with

At a temperature above 35°C

During monsoon, the rice crop of Eastern states of India shows lesser yield due to limiting factor of