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Photosynthesis in Higher Plants · Question 55

AIPMT 2007MCQMedium📈 Topic in 50% papers+4−1
1

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

  1. iron-sulphur protein
  2. ferredoxin
  3. quinone
  4. cytochrome

Answer

(3) quinone

Solution

As per NCERT, in photosystem II the reaction-centre chlorophyll a (P680) absorbs light, its electrons become excited and are accepted by a primary electron acceptor, which passes them to an electron transport system.

∵ The primary acceptor of PS II is a quinone type acceptor (Q, via pheophytin); the electrons then pass through plastoquinone and the cytochrome b6f complex to PS I.

∵ Iron-sulphur protein and ferredoxin are acceptors on the PS I side, and cytochrome comes later in the chain ⇒ (1), (2), (4) are wrong.

Answer: (3)

AIPMT 2007

Keep practising — Photosynthesis in Higher Plants

2

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

  1. stroma of chloroplasts
  2. stroma of chloroplasts and mitochondria
  3. stroma of chloroplasts and peroxisomes
  4. grana of chloroplasts and peroxisomes
AIPMT 2006
3

In photosystem I, the first electron acceptor is

  1. an iron-sulphur protein
  2. ferredoxin
  3. cytochrome
  4. plastocyanin
AIPMT 2006
4

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?

  1. Two
  2. Six
  3. Twelve
  4. Zero
AIPMT 2005
5

Photosynthetic Active Radiation (PAR) has the following range of wavelengths.

  1. 340–450 nm
  2. 400–700 nm
  3. 500–600 nm
  4. 450–950 nm
AIPMT 2005
6

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

  1. effective pumping of CO2 into bundle sheath cells
  2. RuBisCo in C4 plants has higher affinity for CO2
  3. four carbon acids are the primary initial CO2 fixation products
  4. the primary fixation of CO2 is mediated via PEP carboxylase.
AIPMT 2005
7

Chlorophyll in chloroplasts is located in

  1. Stroma
  2. Grana
  3. Pyrenoid
  4. Both (1) and (3)
AIPMT 2005
8

Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on

  1. Proton gradient
  2. Membrane potential
  3. Accumulation of Na+ ions
  4. Accumulation of K+ ions
AIPMT 2005
9

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

  1. malic acid
  2. oxaloacetic acid
  3. 3-phosphoglyceric acid
  4. phosphoglyceraldehyde
AIPMT 2004
10

Plants adapted to low light intensity have

  1. larger photosynthetic unit size than the sun plants
  2. higher rate of CO2 fixation than the sun plants
  3. more extended root system
  4. leaves modified to spines.
AIPMT 2004
11

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

  1. Blue and green
  2. Green and red
  3. Red and violet
  4. Violet and blue.
AIPMT 2003

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