NEET BIOLOGY QUESTION BANK / DARK REACTION

DARK REACTIONhttps://skumartrp98.blogspot.com

v  1) Dark reaction of photosynthesis is called

A) Aphotic action

B) Black action

C) Blackman's reaction

D) None of the above

v    2) In normal chloroplast, the percentage of chlorophyll is

A) 50%

B) 75%

C) 5-10%

D) 95%

v    3) Which of the enzyme is involved in the conversion of 3PGA to 3PGAL

A) Triose phosphate dehydrogenase

B) Carboxydismutase

C) Phosphatase

D) Aldolase

v    4) The number of carbon atoms is five in

A) Xylulose

B) Ribose

C) Ribulose

D) All the above

v    5) Sedohaptulose is a carbohydrate having

A) 3 carbon atoms

B) 2 carbon atoms

C) 4 carbon atoms

D) 7 carbon atoms

v    6) First stable product of Calvin cycle has

A) 2 carbon atoms

B) 3 carbon atoms

C) 4 carbon atoms

D) 6 carbon atoms

v    7) Phosphatase enzymes in

C3

cycle participate in

A) Addition of phosphate

B) Removal of phosphate

C) Both the above

D) The enzyme is not concerned with removal or addition of phosphate

v    8) In dark reaction, first reaction is the

A) Carboxylation

B) Decarboxylation

C) Dehydrogenation

D) Deamidation

v    9) Which one of the following is the product of dark reaction of photosynthesis [Bihar MDAT 1991]

A) 

CO2

B) ATP

C) Pyruvic acid

D) Phosphoglyceraldehyde

v    10) In

C4

plants,

CO2

combine with PEP in presence of [CPMT 1990]

A) PEP carboxylase

B) RuBP carboxylase

C) RuBP oxygenase

D) Hydrogenase

v    11) 

CO2

joins the photosynthetic pathway during [CBSE PMT 1988]

A) Light reaction

B) Dark reaction

C) Photosystem-I

D) Photosystem-II

v    12) Dark reaction of photosynthesis is called so because [CPMT 1976; RPMT 1985; AMU 1988; JIPMER 1988; NCERT 1980]

A) It can also occur in dark

B) It does not require light energy

C) Cannot occur during day time

D) It occurs more rapidly in night

v    13) The initial enzyme of Calvin cycle is [BHU 1989, 90]

A) Ribulose 1, 5 diphosphate carboxylases

B) Triose phosphate dehydrogenase

C) Phosphopentokinase

D) Cytochrome oxidase

v    14) During photosynthesis when PGA is changed into phosphoglyceraldehyde, which of the following reaction occur [BHU 1980]

A) Oxidation

B) Reduction

C) Electrolysis

D) Hydrolysis

v    15) Ribulose diphosphate carboxylase enzyme catalyses the carboxylation reaction between [BHU 1979]

A) Oxaloacetic acid and acetyl CoA

B) 

CO2

and ribulose 1, 5 diphosphates

C) Ribulose diphosphate and phosphoglyceraldehyde

D) PGA and dihydroxy acetone phosphate

v    16) Calvin cycle occur in [BHU 1983; MP PMT 1996; BVP 2002]

A) Chloroplasts

B) Cytoplasm

C) Mitochondria

D) Glyoxisomes

v    17) During dark reaction of photosynthesis [CPMT 1985]

A) Water split

B) 

CO2

is reduced to organic compounds

C) Chlorophyll is activated

D) 6 carbon sugar is broken down into 3 carbon sugar

v    18) Dark reaction of photosynthesis take place in [CPMT 1986, 90; RPMT 1995; MP PMT 2000]

A) Grana

B) Stroma

C) Matrix

D) Cytoplasm

v    19) In

C3

plants, the first stable product of photosynthesis during dark reaction is [CPMT 1986, 90, 92; RPMT 1995; MP PMT 1987, 90, 2000; BHU 1995; CBSE PMT 1995; KCET 1998]

A) 3-phosphoglyceric acid

B) Phosphoglyceraldehyde

C) Maleic acid

D) Oxaloacetic acid

v    20) For the reduction of one molecule of

CO2

with water, the energy required is

A) 100 kcal

B) 110 kcal

C) 120 kcal

D) 210 kcal

v    21) Which part of the photosynthetic process does not require light and temperature dependent

A) Hill's reaction

B) Blackman's reaction

C) Warburg's reaction

D) Emmerson's reaction

v    22) Calvin cycle is [CPMT 1995]

A) Dependent on light

B) Not dependent on light

C) Occurs in light

D) None of these

v    23) How many Calvin cycle form one hexose molecule [CBSE PMT 1996, 2000]

A) 2

B) 6

C) 4

D) 8

v    24) 

CO2

acceptor in

C3

plants is [CBSE PMT 1995, 96,99; CPMT 1999, 2001; RPMT 2002]

A) Xylulose-5-phosphate

B) 3-phosphoglyceric acid

C) Ribulose 1, 5 diphosphates

D) Phosphoenol pyruvic acid

v    25) Which of the following is present in Calvin cycle [CBSE PMT 1996]

A) Photophosphorylation

B) Oxidative carboxylation

C) Reductive carboxylation

D) Oxidative phosphorylation

v    26) Carbon dioxide is fixed in [MP PMT 1999]

A) Light reaction

B) Dark reaction

C) Aerobic respiration

D) Anaerobic respiration

v    27) In which plant Calvin experimented by radioactive isotopy to discover the stable product of

C3

cycle [Orissa JEE 2005]

A) Chlorella

B) Cycas

C) Carrot

D) Tobacco

v    28) The first stable compound of dark reaction of photosynthesis is [BVP 2000]

A) Phosphoglyceraldehyde

B) Phosphoglyceric acid

C) Fractose

D) Starch

v    29) The first step in dark reaction of photosynthesis is [CPMT 2004]

A) Formation of ATP

B) Ionization of water

C) Attachment of 

CO2

 to a pentose sugar

D) Excitement of electron of chlorophyll by a photon of light

v    30) Mesophyll chloroplast of which plant alone is capable of synthesising starch or sucrose

A) 

C3

plant

B) 

C4

plant

C) [a] and [b] both

D) Neither

C3

or

C4

v    31) Number of carboxylation occur in Calvin cycle, is [DPMT 2004]

A) 0

B) 1

C) 2

D) 3

v    32) Which of the following is required for conversion of 3PGAL and dihydroxy acetone phosphate to fructose 1, 6 diphosphate

A) Transketolase

B) Aldolase

C) Phosphatase

D) Hexokinase

v    33) Which of the following is the first compound that accepts carbon dioxide during dark phase of photosynthesis [BHU 2004]

A) NADP

B) RuBP

C) Ferridoxin

D) Cytochrome

v    34) Radioactive

C14

is given to

CO2

and released to atmosphere. This

CO2

is taken by RuBP in a

C3

plant. First radioactive

C14

is seen in which compound [Manipal 2005]

A) PGAL

B) PEP

C) RMP

D) PGA