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Plant Growth and Development · Question 61

AIPMT 2006MCQMedium📈 Topic in 75% papers+4−1
1

Farmers in a particular region were concerned that premature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?

  1. Application of iron and magnesium to promote synthesis of chlorophyll
  2. Frequent irrigation of the crop
  3. Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer
  4. Removal of all yellow leaves and spraying the remaining green leaves with 2,4,5-trichlorophenoxyacetic acid

Answer

(3) Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer

Solution

Premature yellowing of leaves is early leaf senescence (loss of chlorophyll and proteins).

As per NCERT, cytokinins promote nutrient mobilisation, which helps in the delay of leaf senescence.

Leaves stay green longer and continue photosynthesis, while a small dose of nitrogenous fertilizer supplies nitrogen needed for chlorophyll and proteins.

Seed yield is maximum with cytokinin treatment plus a little nitrogen.

Answer: (3)

AIPMT 2006

Keep practising — Plant Growth and Development

2

How does pruning help in making the hedge dense?

  1. It releases wound hormones.
  2. It induces the differentiation of new shoots from the rootstock.
  3. It frees axillary buds from apical dominance.
  4. The apical shoot grows faster after pruning.
AIPMT 2006
3

Treatment of seeds at low temperature under moist conditions to break its dormancy is called

  1. stratification
  2. scarification
  3. vernalization
  4. chelation.
AIPMT 2006
4

Parthenocarpic tomato fruits can be produced by

  1. treating the plants with phenylmercuric acetate
  2. removing androecium of flowers before pollen grains are released
  3. treating the plants with low concentrations of gibberellic acid and auxins
  4. raising the plants from vernalized seeds.
AIPMT 2006
5

Why is vivipary an undesirable character for annual crop plants?

  1. It reduces the vigour of the plant.
  2. It adversely affects the fertility of the plant.
  3. The seeds exhibit long dormancy.
  4. The seeds cannot be stored under normal conditions for the next season.
AIPMT 2005
6

Cell elongation in internodal regions of the green plants takes place due to

  1. indole acetic acid
  2. cytokinins
  3. gibberellins
  4. ethylene.
AIPMT 2004
7

One set of the plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant?

  1. Long day
  2. Darkness neutral
  3. Day neutral
  4. Short day
AIPMT 2004
8

The maximum growth rate occurs in :-

  1. Exponential phase
  2. Stationary phase
  3. Senescent phase
  4. Lag phase
AIPMT 2004
9

Differentiation of shoot is controlled by

  1. high auxin : cytokinin ratio
  2. high cytokinin : auxin ratio
  3. high gibberellin : auxin ratio
  4. high gibberellin : cytokinin ratio.
AIPMT 2003
10

Coconut milk factor is

  1. abscisic acid
  2. an auxin
  3. a gibberellin
  4. cytokinin
AIPMT 2003
11

Which pigment absorbs the red and far-red light?

  1. Cytochrome
  2. Phytochrome
  3. Carotenoids
  4. Chlorophyll
AIPMT 2002

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