Tag: photosynthesis in higher plants

Quizzes (15) Questions (239)

Questions Related to photosynthesis in higher plants

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

In pigment system II, active chlorophyll is

  1. $P _{680}$
  2. $P _{700}$
  3. $P _{673}$
  4. $P _{720}$.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The plant needed enough energy to do the biosynthetic reactions. Its reaction centre is a molecule called P680 which absorbs light maximally at 680 nm.

So the correct option is 'P$ _6$$ _8$$ _0$.'

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Pigment system- I conducts

  1. Cyclic photophosphorylation

  2. Non-cyclic photophosphorylation

  3. Both (A) and (B)

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Z scheme of light reaction is non cyclic fow of electron from PSII through quinone, cyt b6b6 f complex and plastocyanin to NADPH via PSI; it does not return to PSII. NADP reductase enzyme is located on stromal side of PSI; Z scheme includes both PSI and PSII. Absence of PS-II leads to cyclic photophosphorylation in which electrons are passed from PS-I, via electron transfer chain, to back to PS-I with formation of ATP. Cyclic photophosphorylation does not pass electrons to NADP; rather electrons are passed back to PSI. PS I is involved in both cyclic and non cyclic photophosphorylation. Correct answer is B.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Photosynthesis is least in which wavelength of light?

  1. 450 nm

  2. 550 nm

  3. 650 nm

  4. 700 nm
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Two main photosynthetic pigment chlorophyll a and chlorophyll b absorb light in violet blue (400 -500 nm) and red (620-700nm) region of visible spectrum. Neither of these pigments absorbs light between 500 to 600 nm (green light) causing least photosynthesis in this wavelegnth. Thus, the correct answer is option B.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Bacterial photosynthesis contains

  1. PS I.

  2. PS II.

  3. Both PS I and PS II.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Photosynthetic bacteria are anaerobic and only one type of photosystem is found in them but cyanobacteria or blue-green algae have both systems PSI and PSII.  It has two types of pigments bacteriochlorophyll which differs from chlorophyll a, in having one pyrrole ring with two hydrogens and bactericidin.

So the correct option is 'PS I'.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

In photosystem- I, the first electron acceptor is

  1. Plastocyanin

  2. An iron-sulphur protein

  3. Ferredoxin

  4. Cytochrome
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

PSI passes electron to ferredoxin on stromal side of lumen. Ferredoxin (iron sulfur protein) receives electrons from PSI and reduces to NADP+ to form NADPH. This light reaction is catalyzed by the membrane-bound enzyme NADP reductase. Both B and C are correct answers. 

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

PS II contains a non-chlorophyllous pigment in blue-green algae

  1. $\beta$-carotene

  2. Zeaxanthin

  3. Phycocyanin

  4. Cytochrome c.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Photosynthetic bacteria are anaerobic and only one type of photosystem is found in them but cyanobacteria or blue-green algae have both systems PSI and PSII. In PS I contain only one chlorophyll that is chlorophyll a while PS II contains various yellowish carotenoids and phycocyanin that differ in colour in different species.

So the correct option is 'Phycocyanin'.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Which is sensitive to longer wavelengths of light

  1. PS II

  2. PS I

  3. Phosphorylation

  4. Photolysis.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photosystems are the functional and structural unit of photosynthesis that contains chlorophyll and various electron carriers that helps in energy liberation.

These are divided into two in which photosystem I absorb light of wavelength 700 nm and photosystem II which absorbs light of wavelength 680 nm.
So the correct option is 'PS I'.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Photo-oxidation or photolysis of water (in photosynthesis) occurs in association of

  1. Cytochrome $b _6$f

  2. Plastocyanin

  3. PS II

  4. PS I
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Photolysis of water is carried out to fulfill the need of electrons that are given by photosystem II to photosystem I in the Z scheme. The splitting of water is associated with PSII in which water is split into H$^+$, [O] and electrons and this also creates oxygen, one of the net product of photosynthesis.

So, the correct option is 'PS II'.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Constituents of pigment system I are located on

  1. Granal thylakoids

  2. Stromal thylakoids

  3. Outer surface of granal and stromal thylakoids

  4. Stroma.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The constituents of PS I is located in the thylakoid membrane of stroma and the outer surface of grana, contain a number of light-harvesting complexes and a reaction centre complex, which is a protein complex with two special chlorophyll a molecules and a primary electron acceptor.

So the correct option is 'Outer surface of granal and stromal thylakoids'.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Pigment system connected with oxidation of water is

  1. Photosystem I

  2. Photosystem II

  3. Phycobilisome

  4. Carotenoids
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photosystem II (or water-plastoquinone oxidoreductase) is the first protein complex in the light-dependent reactions of oxygenic photosynthesis. It is located in the thylakoid membrane of plants, algae and cyanobacteria. Within the photosystem, enzymes capture photons of light to energize electrons that are then transferred through a variety of co-enzymes and co-factors to reduce plastoquinone to plastoquinol. The energized electrons are replaced by oxidizing water to form hydrogen ions and molecular oxygen.


So, the correct option is 'Option  B'.