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Plant Growth and Development · Question 64

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

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.

Answer

(3) treating the plants with low concentrations of gibberellic acid and auxins

Solution

Parthenocarpic fruits develop without fertilisation (seedless).

As per NCERT, auxins induce parthenocarpy, e.g., in tomatoes; gibberellins also help in fruit growth and setting.

Spraying low concentrations of gibberellic acid and auxins produces parthenocarpic tomatoes.

Removing the androecium (emasculation) alone makes the flower unable to self-pollinate; it does not by itself give fruit.

Answer: (3)

AIPMT 2006

Keep practising — Plant Growth and Development

2

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
3

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
4

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
5

The maximum growth rate occurs in :-

  1. Exponential phase
  2. Stationary phase
  3. Senescent phase
  4. Lag phase
AIPMT 2004
6

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
7

Coconut milk factor is

  1. abscisic acid
  2. an auxin
  3. a gibberellin
  4. cytokinin
AIPMT 2003
8

Which pigment absorbs the red and far-red light?

  1. Cytochrome
  2. Phytochrome
  3. Carotenoids
  4. Chlorophyll
AIPMT 2002
9

Seed dormancy is due to the

  1. ethylene
  2. abscisic acid
  3. IAA
  4. starch
AIPMT 2002
10

Dwarfness can be controlled by treating the plant with

  1. cytokinin
  2. gibberellic acid
  3. auxin
  4. antigibberellin
AIPMT 2002
11

Which plant is LDP?

  1. Tobacco
  2. Glycine max
  3. Mirabilis jalapa
  4. Spinach
AIPMT 2001

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