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Photosynthesis in Higher Plants · Question 64

AIPMT 2004MCQMedium📈 Topic in 0% papers+4−1
1

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.

Answer

(1) larger photosynthetic unit size than the sun plants

Solution

A photosynthetic unit is a group of pigment molecules (antenna / light-harvesting complex) that pass the trapped energy to one reaction centre.

∵ Shade plants (low light) must trap as much of the weak light as possible, they have more chlorophyll and larger light-harvesting complexes per reaction centre.

⇒ Their photosynthetic unit is larger than that of sun plants.

∵ Light is limiting, their rate of CO2 fixation is lower than that of sun plants; extended roots and spiny leaves are xerophytic adaptations, not shade adaptations.

∴ Plants adapted to low light intensity have a larger photosynthetic unit size than the sun plants.

Answer: (1)

AIPMT 2004

Keep practising — Photosynthesis in Higher Plants

2

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
3

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
4

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
5

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
6

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

  1. Calcium
  2. Magnesium
  3. Potassium
  4. Manganese
AIPMT 2003
7

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
8

Which of the following absorbs light energy for photosynthesis?

  1. Chlorophyll
  2. Water molecule
  3. O2
  4. RuBP
AIPMT 2002
9

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
10

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
11

Which pair is wrong?

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

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