Class 11th Biology – 13 Photosynthesis MCQs
How many carbon atoms should the initial acceptor molecule have in the Hatch and Slack Pathway?
The primary CO2 acceptor is a 3-carbon molecule phosphoenol pyruvate (PEP) and is present in the mesophyll cells.
The ultimate gain of light reaction is
The ultimate gain of light reaction is ATP & NADPH2
Which is not used during photosynthesis?
Experiments have proven that during photosynthesis chlorophyll,light, and CO2 are used, whereas O2 is released.
Greatest producers of organic matter are
Phytoplanktons (algae) of ocean are the highest producers of organic matter
In which of the following plants, photorespiration does not occur?
In C4 plants photorespiration does not occur. Sugarcane is C4 plant, whereas wheat, barley, and potatoes are C3 plants.
Which one of the following is wrong in relation to photorespiration
Trophical plants have evolved C4 cycle to overcome photorespiration
Solarization is a process in which?
Solarization is a process in which destruction of cholorophyll and ultimate death of protolasmic components.
Which one occurs both during cyclic and noncyclic modes of photophosphorylation
Cyclic photophosphorylation involves only PS I and forms only ATP not NADPH2.
Which of the following replaces the electron that moves from photosystem?
Water is split into H+, [O] and electrons. This gives oxygen, one of the net products of photosynthesis and the electrons. These electrons are used to replace those removed from photosystems.
Splitting of water in photosynthesis is called
Splitting of water in photosysnthesis is called photolysis
How many molecules of glucose are synthesized in every 6 turns of Calvin pathway?
In Calvin pathway, only one glucose molecule is synthesized after every 6 turns of Calvin pathway
How many turns of calvin cycle yield one molecule of glucose.
Each turn of calvin cycle generates one carbon atom hence six turn of the the cycle is required to generate one molecule of hexose sugar glucose.
Which of the following scientists told that sunlight is essential to plant?
Jan Ingenhousz proved that sunlight is essential to plant.
The factor that interferes with the action of stomata is ____.
Water stress causes the stomata to close hence reducing the CO2 availability.
Photosynthetic pigment found in the choloroplasts occur in
Photosynthetic pigment occur in thyakoid membren of chloroplasts.
How many carbon atoms should the initial acceptor molecule in the dark reaction have?
The scientists conducted many experiments and discovered that the 5-carbon RuBP as the initial acceptor molecule.
Photophosphorylation means synthesis of
Photophosphorylation means synthesis of ATP from ADP and inorganic phosphate in presence of light
Which of the following pigment forms the reaction center?
The single chlorophyll a molecule forms the reaction center in both the photosystems, PSI and PSII.
Translocation of carbohydrate nutrient usually occurs in the form of
Translocation of organic solutes occurs through sieve tubes in the form of sucrose. Transportable form of sugar is sucrose.
Chlorophyll a occurs in
Chlorophyll a is found in all photosysnthetic plants except bacteria. Hence, it is termed as universal photosynthetic pigment
Bacterial photosynthesis involves
Bactreial Photosynthesis involes PS-I only.
Chloroplasts fix
Cholroplasts fix carbon dioxide
In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in cell of
In the leaves of c4 plants, malic acid formation occurs in mesophyll cell during CO2 fixation.
Which of the following is not a characteristic feature of C4 plants?
C4 plants lack a process called photorespiration and all other characters listed are true regarding C4 plants.
Cytochrome is
Cytochrome is fe containing porphyrin pigment. These are electron transferring proteins often regarded as enzymes.
The major limiting factor for photosynthesis is ____.
Carbon dioxide Concentration is the major limiting factor for photosynthesis.
Maximun solar energy is trapped by
Algae are the most efficent photosynthesizer
The enzyme which catalyzes the photosynthetic C4 cycle is
PEP carboxylase catalyzes the photosynthetic C4 cycle
Why is lumen of the thylakoids filled with protons and hydrogen ions?
Since splitting of the water molecule takes place on the inner side of the membrane, the protons or hydrogen ions produced by the splitting of water accumulate within the lumen of the thylakoids.
Which of the following helps in trapping the light energy in the chloroplast?
The membrane system is responsible not only for trapping the light energy but also for ATP and NADPH synthesis.
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