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Plant Growth and Development · Question 62

AIPMT 2006MCQEasy📈 Topic in 50% papers+4−1
1

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.

Answer

(3) It frees axillary buds from apical dominance.

Solution

The growing apical bud produces auxin, which inhibits the growth of lateral (axillary) buds — apical dominance.

As per NCERT, removal of shoot tips (decapitation) usually results in the growth of lateral buds; this is widely applied in tea plantations and hedge-making.

Pruning removes the apical buds, the axillary buds grow into branches and the hedge becomes dense.

Answer: (3)

AIPMT 2006

Keep practising — Plant Growth and Development

2

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
3

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
4

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
5

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
6

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
7

The maximum growth rate occurs in :-

  1. Exponential phase
  2. Stationary phase
  3. Senescent phase
  4. Lag phase
AIPMT 2004
8

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
9

Coconut milk factor is

  1. abscisic acid
  2. an auxin
  3. a gibberellin
  4. cytokinin
AIPMT 2003
10

Which pigment absorbs the red and far-red light?

  1. Cytochrome
  2. Phytochrome
  3. Carotenoids
  4. Chlorophyll
AIPMT 2002
11

Seed dormancy is due to the

  1. ethylene
  2. abscisic acid
  3. IAA
  4. starch
AIPMT 2002

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