Photosynthesis Questions: Paper - 03

Sr. No.

Questions

Answers

What happens during light reaction

(A) CO₂ reacts with H₂

(B) Synthesis of PGAL

(C) Lysis of water molecule

(D) CO₂ combines with H₂O

Photosynthesis takes place

(A) Only in green light

(B) Only in sunlight

(C) In visible light obtained from any source

(D) Only in high intensity of light

Chlorophyll-a differes from chlorophyll-b in having---

(A) Methly group instead of aldehyde group

(B) Aldehyde group instead of methyl group

(C) Methyl group instead of ethyl group

(D) Only phytol tail instead of head

In non-cyclic photophosphorylation

(A) ATP is generated

(B) Both PSI and PSII are involved

(C) Electron flow is unidirectional

(D) All the above

During photosynthesis the reaction when PGA is converted into PGAL, is called

(A) Isomerization

(B) Reduction

(C) Oxidation

(D) Phosphorylation

In C3 pathway, the first stable compound is

(A) PGAL

(B) OAA

(C) PGA

(D) RUDP

In con-cyclic photophosphorylation, the electron emitted by P₆₈₀ is replaced by electron from

(A) NADP

(B) Water

(C) Ferridoxin 

(D) Chlorophyll-a

85-90% (9/10) of all photosynthesis in the world is carried out by

(A) Shrubs

(B) Algae of the oceans

(C) Herbs

(D) Scientists in the laboratory

The source of  oxygen evolved during photosynthesis is

(A) H₂O

(B) CO₂

(C) chl-a

(D) glucose

In C₄ plants, synthesis of glucose occurs in

(A) Spongy cells

(B) Bundle sheath cells

(C) Mesophyll cells

(D) Palisade cells

In cyclic and non-cyclic photophosphorylation, the first acceptor of electron are

(A) Plastoquinone and ferridoxin

(B) Cyt b₆ and cyt. f

(C) Ferridoxin in both

(D) Ferridoxin and plastoquinone respt.

Primary and secondary processes of Photosynthesis takes place in ______ and ______ respectively.

(A) Stroma and grana

(B) Stroma and lamellae

(C) Thylakoid and quantasome

(D) Grana and stroma

Which one occurs during both cyclic and non-cyclic photophosphorylation

(A) Formation of ATP

(B) Release of O₂

(C) Formation of NADPH₂

(D) Involvement of both PSI and PSII

The prerequisities of Calvins cycle are

(A) H₂O, CO₂, ATP

(B) ATP, H₂O, NADPH₂

(C) CO₂, ATP, NADPH₂

(D) NADPH₂, H₂O, CO₂

The photochemical process in photosynthesis which needs both PSI and PSII also involves

(A) Photolysis of water

(B) Z-scheme of electron transfer

(C) Synthesis of assimilatory power

(D) All of these

For synthesis of one molecule of glucose, the requirement of ATP and NADPH₂ is respectively

(A) 15 and 10

(B) 12 and 8

(C) 30 and 15

(D) 18 and 12

Which of the following element is needed for chlorophyll biosynthesis?

(A) Copper

(B) Magnesium

(C) Calcium

(D) Chlorine

In the calvin cycle, the assimilatory power is used during

(A) Formation of 3-PGA

(B) Conversion of 3-PGA to 3-PGAL

(C) Formation of fructose 1-6 diphsophate from PGAL

(D) Formation of glucose from fructose 1-6 diphosphate

The two enzymes responsible for primary carboxylation in C₃ and C₄ pathway, respectively are

(A) RUBP carboxylase and RUBP oxygenase

(B) PEP carboxylase and RUBP carboxylase

(C) RUBP carboxylase and PEP carboxylase

(D) PEP carboxylase and pyruvate carboxylase

_______ are placed one above the other to form stack of coins

(A) oxysomes

(B) F1 particles

(C) cristae

(D) thylakoids

During Photosynthesis

(A) Both CO₂ and water get oxidised

(B) Both CO₂ and water get reduced 

(C) Water is oxidised and CO₂ is reduced

(D) Water reduced and CO₂ is oxidized

Unidirectional flow of e^- in non-cyclic photophosphorylation is

(A) PS II  PS I  NADP  water

(B) Water  PSII  PS I  NADP

(C) PS I  NADP  water  PS II

(D) Water  PS I  PS II  NADP

ATP synthesis during light reaction is

(A) Photophosphorylation

(B) Photolysis

(C) Oxidative phosphorylation

(D) Phosphorylation

In photosynthesis, the first step is

(A) Phtolysis of water

(B) Production of NADPH₂

(C) Photoexcitation of chlorophyll

(D) Synthesis of ATP

Calvin was given Nobel prize in 1961 for his discovery of

(A) Mode of carbon fixation

(B) Photosynthesis

(C) Photolysis of water

(D) Light reaction