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Photosynthesis in Higher Plants · Question 63

AIPMT 2004MCQEasy📈 Topic in 88% papers+4−1
1

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

Answer

(3) 3-phosphoglyceric acid

Solution

As per NCERT, in the Calvin cycle CO2 is accepted by RuBP (catalysed by RuBisCO), and the first stable product is the 3-carbon compound 3-phosphoglyceric acid (PGA); hence the name C3 pathway.

Oxaloacetic acid (OAA) is the first product of the C4 pathway, and malic acid is formed from it.

Answer: (3)

AIPMT 2004

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2

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
3

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
4

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.
AIPMT 2003
5

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
6

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
7

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

  1. Calcium
  2. Magnesium
  3. Potassium
  4. Manganese
AIPMT 2003
8

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
9

Which of the following absorbs light energy for photosynthesis?

  1. Chlorophyll
  2. Water molecule
  3. O2
  4. RuBP
AIPMT 2002
10

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
11

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

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