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Plant Growth and Development · Question 70

AIPMT 2003MCQEasy📈 Topic in 75% papers+4−1
1

Coconut milk factor is

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

Answer

(4) cytokinin

Solution

As per NCERT, cytokinins were discovered as kinetin from autoclaved herring sperm DNA; the search for substances with cytokinin-like activity led to the isolation of zeatin from corn kernels and coconut milk.

∵ Coconut milk (liquid endosperm) promotes cell division in tissue culture, which is the characteristic action of a cytokinin.

∴ Coconut milk factor is a cytokinin.

Answer: (4)

AIPMT 2003

Keep practising — Plant Growth and Development

2

Which pigment absorbs the red and far-red light?

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

Seed dormancy is due to the

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

Dwarfness can be controlled by treating the plant with

  1. cytokinin
  2. gibberellic acid
  3. auxin
  4. antigibberellin
AIPMT 2002
5

Which plant is LDP?

  1. Tobacco
  2. Glycine max
  3. Mirabilis jalapa
  4. Spinach
AIPMT 2001
6

Which of the following prevents the fall of fruits?

  1. GA3
  2. NAA
  3. Ethylene
  4. Zeatin
AIPMT 2001
7

Hormone responsible for senescence is

  1. ABA
  2. auxin
  3. GA
  4. cytokinin
AIPMT 2001
8

Which hormone breaks dormancy of potato tuber?

  1. Gibberellin
  2. IAA
  3. ABA
  4. Zeatin
AIPMT 2001
9

Proteinaceous pigment which controls the activities concerned with light is

  1. Carotenoids
  2. Phytochrome
  3. Chlorophyll
  4. Anthocyanin
AIPMT 2001
10

If the apical bud has been removed then we observe

  1. more lateral branches
  2. more axillary buds
  3. plant growing stops
  4. flowering stops
AIPMT 2000
11

By which action a seed coat becomes permeable to water?

  1. scarification
  2. stratification
  3. vernalization
  4. all of the above
AIPMT 2000

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