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Plant Growth and Development · Question 68

AIPMT 2004MCQEasy📈 Topic in 25% papers+4−1
1

The maximum growth rate occurs in :-

  1. Exponential phase
  2. Stationary phase
  3. Senescent phase
  4. Lag phase

Answer

(1) Exponential phase

Solution

As per NCERT, a plot of growth against time gives a sigmoid (S-shaped) curve with a lag phase, an exponential (log) phase and a stationary phase.

∵ In the exponential phase all progeny cells keep dividing (geometric growth),

∴ the growth rate is maximum in this phase; growth is slow in the lag phase and slows down / stops in the stationary and senescent phases.

Answer: (1)

AIPMT 2004

Keep practising — Plant Growth and Development

2

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
3

Coconut milk factor is

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

Which pigment absorbs the red and far-red light?

  1. Cytochrome
  2. Phytochrome
  3. Carotenoids
  4. Chlorophyll
AIPMT 2002
5

Seed dormancy is due to the

  1. ethylene
  2. abscisic acid
  3. IAA
  4. starch
AIPMT 2002
6

Dwarfness can be controlled by treating the plant with

  1. cytokinin
  2. gibberellic acid
  3. auxin
  4. antigibberellin
AIPMT 2002
7

Which plant is LDP?

  1. Tobacco
  2. Glycine max
  3. Mirabilis jalapa
  4. Spinach
AIPMT 2001
8

Which of the following prevents the fall of fruits?

  1. GA3
  2. NAA
  3. Ethylene
  4. Zeatin
AIPMT 2001
9

Hormone responsible for senescence is

  1. ABA
  2. auxin
  3. GA
  4. cytokinin
AIPMT 2001
10

Which hormone breaks dormancy of potato tuber?

  1. Gibberellin
  2. IAA
  3. ABA
  4. Zeatin
AIPMT 2001
11

Proteinaceous pigment which controls the activities concerned with light is

  1. Carotenoids
  2. Phytochrome
  3. Chlorophyll
  4. Anthocyanin
AIPMT 2001

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All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
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