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Plant Growth and Development · Question 65

AIPMT 2005MCQMedium📈 Topic in 0% papers+4−1
1

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.

Answer

(4) The seeds cannot be stored under normal conditions for the next season.

Solution

Vivipary is the germination of seeds while they are still attached to the parent plant (e.g. mangroves such as Rhizophora).

⇒ Such seeds have no dormancy period; they germinate at once.

⇒ For an annual crop, seed must remain dormant and viable until the next sowing season.

∴ Viviparous seeds cannot be stored under normal conditions for the next season.

Answer: (4)

AIPMT 2005

Keep practising — Plant Growth and Development

2

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
3

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
4

The maximum growth rate occurs in :-

  1. Exponential phase
  2. Stationary phase
  3. Senescent phase
  4. Lag phase
AIPMT 2004
5

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
6

Coconut milk factor is

  1. abscisic acid
  2. an auxin
  3. a gibberellin
  4. cytokinin
AIPMT 2003
7

Which pigment absorbs the red and far-red light?

  1. Cytochrome
  2. Phytochrome
  3. Carotenoids
  4. Chlorophyll
AIPMT 2002
8

Seed dormancy is due to the

  1. ethylene
  2. abscisic acid
  3. IAA
  4. starch
AIPMT 2002
9

Dwarfness can be controlled by treating the plant with

  1. cytokinin
  2. gibberellic acid
  3. auxin
  4. antigibberellin
AIPMT 2002
10

Which plant is LDP?

  1. Tobacco
  2. Glycine max
  3. Mirabilis jalapa
  4. Spinach
AIPMT 2001
11

Which of the following prevents the fall of fruits?

  1. GA3
  2. NAA
  3. Ethylene
  4. Zeatin
AIPMT 2001

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