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Photosynthesis in Higher Plants · Question 66

AIPMT 2003MCQEasy📈 Topic in 25% papers+4−1
1

Which one of the following is wrong in relation to photorespiration?

  1. It occurs in chloroplast
  2. It occurs in day time only
  3. It is a characteristic of C4 plants
  4. It is a characteristic of C3 plants.

Answer

(3) It is a characteristic of C4 plants

Solution

Photorespiration begins in the chloroplast when RuBisCO binds O2 instead of CO2; it needs light, so it occurs only in day time. It is a feature of C3 plants.

As per NCERT, in C4 plants photorespiration does not occur, because the mechanism that increases CO2 concentration at the enzyme site minimises the oxygenase activity of RuBisCO.

∴ "It is a characteristic of C4 plants" is the wrong statement.

Answer: (3)

AIPMT 2003

Keep practising — Photosynthesis in Higher Plants

2

In sugarcane plant 14CO2 is fixed to malic acid, in which the enzyme that fixes CO2 is

  1. ribulose bisphosphate carboxylase
  2. phosphoenolpyruvic acid carboxylase
  3. ribulose phosphate kinase
  4. fructose phosphate.
AIPMT 2003
3

Stomata of CAM plants

  1. are always open
  2. open during the day and close at night
  3. open during the night and close during the day
  4. never open.
AIPMT 2003
4

Which element is located at the centre of the porphyrin ring in chlorophyll?

  1. Calcium
  2. Magnesium
  3. Potassium
  4. Manganese
AIPMT 2003
5

Which one of the following concerns photophosphorylation?

  1. ADP + AMP Light energy ATP
  2. ADP + Inorganic PO4 Light energy ATP
  3. ADP + Inorganic PO4 ATP
  4. AMP + Inorganic PO4 Light energy ATP
AIPMT 2003
6

Which of the following absorbs light energy for photosynthesis?

  1. Chlorophyll
  2. Water molecule
  3. O2
  4. RuBP
AIPMT 2002
7

In photosynthesis energy from light reaction to dark reaction is transferred in the form of

  1. ADP
  2. ATP
  3. RuDP
  4. chlorophyll
AIPMT 2002
8

Which pigment system is inactivated in red drop?

  1. PS-I and PS-II
  2. PS-I
  3. PS-II
  4. None of the above
AIPMT 2001
9

Which pair is wrong?

  1. C3-maize
  2. C4-Kranz anatomy
  3. Calvin cycle-PGA
  4. Hatch and Slack cycle-OAA
AIPMT 2001
10

Which is the first CO2 acceptor enzyme in C4 plants?

  1. RuDP carboxylase
  2. Phosphoric acid
  3. RuBisCO
  4. PEP- carboxylase
AIPMT 2000
11

For assimilation of one CO2 molecule, the energy required in form of ATP and NADPH2 are

  1. 2 ATP and 2 NADPH2
  2. 5 ATP and 3 NADPH2
  3. 3 ATP and 2 NADPH2
  4. 18 ATP and 12 NADPH2
AIPMT 2000

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